electroweak interactions & unified theories · 2016. 3. 29. · moriondew, mar 19, 2016...
TRANSCRIPT
MoriondEW, Mar 19, 2016 Experimental Summary
51st Rencontre de Moriond
Electroweak Interactions & Unified Theories
— Experimental Summary —
Andreas Hoecker (CERN)
La Thuile, 19 March 2016
MoriondEW, Mar 19, 2016 Experimental Summary
This Moriond EW & UT conference featured — as is tradition — a vibrant snapshot of newest results and trends in the fields of neutrino physics, astrophysics & cosmology, gravitational waves (!), dark matter and collider physics (it became the promised LHC feast).
Beautifully prepared talks! 53 on experimental results. We live in data-driven times.
I also found the YSF talks very interesting and well prepared.
Many thanks, indeed, to all the speakers!
Attempt for a summary …
MoriondEW, Mar 19, 2016 Experimental Summary
Warning: in case you are asked next time, consider :
You won’t have this:
MoriondEW, Mar 19, 2016 Experimental Summary
Warning: in case you are asked next time, consider :
You won’t have this:
But rather…
MoriondEW, Mar 19, 2016 Experimental Summary
Views from a hotel room…
Wednesday, Mar 16: great Friday, Mar 18: bad
MoriondEW, Mar 19, 2016 Experimental Summary
Neutrino physics
Another Nobel Price*for particle physics in 2015, and another one for neutrino oscillation !
Fluxed of 8B solar neutrinos measured by SNO and SK
-0.8 -0.4 0 0.4 0.80
200
-0.8 -0.4 0 0.4 0.8
multi-GeV e-like
cosΘ
multi-GeV μ-like + PC
cosΘ
Zenith angle distribution in SK for e-like and μ-like events above 1.35 GeV. Boxes show expectation without oscillation
*Awarded jointly to T. Kajita and A.B. McDonald
MoriondEW, Mar 19, 2016 Experimental Summary
Neutrino physics
What do we know
Neutrinos are massive fermions
Three active neutrino flavours
Neutrino mass eigenstates are mixed flavour states, governed by PMNS matrix
Critical questions:
Neutrino nature: Majorana fermions?
Δm2 (2.5%) and angles (3–7%) pretty well known
Neutrino masses: absolute values & hierarchy
CP violation in neutrino sector (δCP in flavour-changing PMNS elements)
Are there sterile neutrinos, can we observe heavy additional neutrinos ?
But also: neutrino cross section and flux measurements and predictions
MoriondEW, Mar 19, 2016 Experimental Summary
Neutrino physics
The tools
Neutrino oscillation measurements (short / long baseline)
Single beta decay
Neutrinoless double beta decay
Cosmology (Graziano Rossi: Σm < 0.12 eV with Ly- , CMB, BAO combined)
And also neutrinos as messengers in astronomy, Sun & geo science, as well as for GUT, lepto/baryogenesis and physics beyond the SM
MoriondEW, Mar 19, 2016 Experimental Summary
Neutrinos from short-baseline accelerators: MicroBooNE170 ton LAr TPC neutrino experiment at FNAL that started data taking in October 2015
~500m from BNB ~ μ beam, dedicated to low-energy neutrino cross sections to investigate the excess seen by MiniBooNE in μ → e (and anti-…) appearance
Also step towards kiloton LAr TPC: DUNE (far detector) at LBNF (up to 2.4 MW beam power)
Principle: charged particle interacts with Ar: wire planes detect drifting ionisation electrons (→ tracks), PMTs detect scintillation light, use dE/dx to separate between e/γ
Eve
nts/
MeV
0.5
1.0
1.5
2.0
2.5
Data (stat err.)+/-
μ from eν+/- from Keν0 from Keν
misid0π
γ N→ Δ
dirtotherConstr. Syst. Error
Neutrino
(GeV)QEνE
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
Eve
nts/
MeV
0.0
0.2
0.4
0.6
0.8
1.0
1.2 Antineutrino
3.01.5
MiniBooNE, PRL 110, 161801 (2013)
~3σ excess of electron-like events in Cherenkov detector
Electrons or photons ?
There is also the LSND anti- e excess
MicroBooNE event display
Sarah Lockwitz
MoriondEW, Mar 19, 2016 Experimental Summary
)2 (GeVQE2Q
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
/ n
ucl
eon
)2
/ G
eV2
cm
-39
(10
QE
2d
Qσd 0
2
4
6
8
10
12
Data
Simulation
/ndf = 8.75/9 = 0.972χ
P.O.T.)20 10×Absolutely normalized (3.49 Data: inner errors statistical
Simulation: statistical errors only
Neutrinos from short-baseline accelerators: MINERvADetailed study of neutrino interactions in varying nuclear targets (C, Pb, Fe, H2O)
For example, e CCQE is oscillation signal, but little low-energy cross-section data available. Can μ → e cross-sections be trusted universally ?
Exclusive measurement of flux-integrated differential cross section for e CCQE-like interactions
Sufficiently good description for current experiments
Next steps: higher beam E
e n → e– p (dominant) and e p → e+ n in hydrocarbon target
Non-magnetic tracking volume
Daniel Rutherbories
at NuMI, ~1km after NuMI target, 3.1 GeV peak μ energy (low-energy beam flux).
Detector features charged particle and em & had energy reconstruction, PID, uses MINOS (ND) as μ spectrometer
Test and improve –N interactions modelling
MoriondEW, Mar 19, 2016 Experimental Summary
Long-baseline neutrino experimentsExtremely rich present and future long-baseline neutrino programme
DUNE LAr-TPC far detectorat 1.5 km level4 modules, 10 kton each Initial 1.2 MW beam (cf. 700 kW NuMI for Nova)
T2K beamline
look at μ disappearance and μ → e appearance + their anti processes
Probabilities depend on sin2(2θ13), well measured and large, on sin2(θ23), on δCP (→ CP violation), and on the sign of Δm2
31 (→ mass hierarchy)
→ All these properties can be experimentally addressed
Tokai to Kamioka (T2K) long-baseline experiment
MoriondEW, Mar 19, 2016 Experimental Summary
Long-baseline neutrino experiments: MINOSND 24 ton, ~1 km on target; FD 4.2 kton (ND+FD magnetised), 735 km in Soudan mine, 705 m deep
released in May 2014 a combined analysis of μ disappearance and μ → e appearance data
Talk this week reported search for sterile neutrino using μ beam: 1 sterile introduces 6 new parameters. For simplicity set CP phases and θ14 = 0, fit: Δm2
32, Δm241, θ23, θ24, θ34
Ashley Timmons
0.2
0.4
0.6
0.8
0.2
0.4
0.6
0.8MINOS Preliminary
) = 0.41 23θ(2 sin
2 eV-3 = 2.37 x10322mΔ
) = 0.022 13θ(2 sin
2 eV-5 = 7.54 x10212mΔ
0 1 2 3 4 55 10 15 2020 3030 40
CC selection
0.1
0.2
0.3
0.4
0.5
0.1
0.2
0.3
0.4
0.5MINOS data
Three-flavour simulation
Systematic uncertainty
NC selection
0 1 2 3 4 55 10 15 2020 3030 40
)-3
Far
/ N
ear
Rat
io (
x10
Reconstructed Energy (GeV)
41
d )24θ(2sin-410 -310 -210 -110 1
)2 (
eV412
mΔ
-410
-310
-210
-110
1
10
210
runningμν POT2010.56x10
MINOS data
MINOS Preliminary
MINOS data 90% C.L.
MINOS data 95% C.L.
Super-K 90% C.L.
CDHS 90% C.L.
CCFR 90% C.L.
SciBooNE + MiniBooNE 90% C.L.
active – sterile mixing may affect ND reference.Thus: combined fit of FD / ND ratio. Find agreement with 3-flavour model → limits
MoriondEW, Mar 19, 2016 Experimental Summary
Reconstructed Neutrino Energy (GeV)0 1 2 3 4 5
Eve
nts
/ 0.2
5 G
eV
0
10
20
30
40
50 DataUnoscillated predictionBest fit prediction (no systs)
syst. rangeσExpected 1-
Best fit prediction (systs)Backgrounds
Normal Hierarchy
POT-equiv.2010×2.74
=19.0/16dof/N2χBest fit
23θ2sin0.3 0.4 0.5 0.6 0.7
)2 e
V-3
(10
322m
Δ
2.0
2.5
3.0
3.5Normal Hierarchy, 90% CL
AνNOT2K 2014MINOS 2014
Long-baseline neutrino experiments: NOvA14 kton FD (810 km, on surface), 0.3 kton ND, both are fine-grained tracking calorimeters
~0.8º off-axis from the NuMI beam → narrow E( μ) ~ 2 GeV, ~maximum of μ disappearance and e appearance, e ID
First results using 11/2014–6/2015 data (< 500 kW beam power):
e cross-section (a bit higher than T2K & Gargamelle → GENIE)
μ disappearance gives first measurement of Δm232 and sin2θ23:
Also first μ → e appearance result: 6/11 (LID/LEM) events observed in FD for ~1 expected background event (based on ND measurement). 3.3/5.3σ excess, LEM result less compatible with inverted hierarchy
With magnetic horns focusing on positive mesons NuMI beam composed of 97.6% μ, 1.7% anti- μ, 0.7 e + anti- e for neutrino energies between 1 and 3 GeV.
Beautifully simple detector technology
Jeff Hartnell
MoriondEW, Mar 19, 2016 Experimental Summary
Long-baseline neutrino experiments: T2K295 km baseline, far detector SK (water), near detectors INGRIDon / ND280off (different target materials)
2.5º off beam axis giving narrow E( μ) ~ 0.6 GeV. ND280 target so far carbon, not same as SK
[ Combined μ → μ / e analysis (2010–2013, !2011 data) provided world’s best Δm232, θ23 measurements ]
Christine Nielsen
Anti- μ mode during Run 5–6 (2014/15): 11×1020 POT (cf. NOvA: 2.7×1020), 390 kW max beam power
Larger wrong-sign background, must measure in near detector: ~10% flux and cross-section uncertainties: improve by combined fit of model together with external and ND280 data as input to oscillation fit
→ Anti- μ disappearance: 34 μ events observed. Anti- e appearance: 3 events seen, not yet significant
)23θ(2) or sin23θ(2sin0.2 0.3 0.4 0.5 0.6 0.7 0.8
)2| (
eV322
mΔ
| or
|322
mΔ|
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5-310×
90% CLνT2K 68% CLνT2K 90% CLνT2K
90% CLνMINOS 90% CLνSuper-K
best fitνT2K best fitνT2K
best fitνMINOS best fitνSuper-K
Eve
nts/
0.1
GeV
0.5
1
1.5
2
2.5
3Data
CCQEμν CCnon-QEμν CCQEμν CCnon-QEμν
NC CCeν + eν
-mode best fitν
POT2010× beam 4.01νT2K
Energy (GeV)νReconstructed
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5no o
scill
atio
nsR
atio
to 0.51
1.5
Clear evidence of oscillation in anti-μ disappearance
MoriondEW, Mar 19, 2016 Experimental Summary
Long-baseline neutrino experiments: OPERABreakthrough in July 2015 with > 5σ observation of tau neutrino appearance (5 τ candidates)
exploits 732 km (2.5 ms) CNGS μ beam to search for τ appearance
Charged-current neutrino interactions are recorded in detectors (bricks) of lead and emulsion film with sub-micron resolution. Total target of 150k bricks. Additional target trackers & muon spectrometers.
Data between 2008 and 2012 were analysed, corresponding to 18×1019 POT giving 20k neutrino interactions in detector (6.7k analysed)
Event display of 5thτ candidate in emulsion
ChannelExpected background
Expected signal ObservedCharm Had. reinterac. Large μ scat. Total
τ → 1h 0.017± 0.003 0.022± 0.006 0.04± 0.01 0.52± 0.10 3τ → 3h 0.17± 0.03 0.003± 0.001 0.17± 0.03 0.73± 0.14 1τ → μ 0.004± 0.001 0.0002± 0.0001 0.004± 0.001 0.61± 0.12 1τ → e 0.03± 0.01 0.03± 0.01 0.78± 0.16 0Total 0.22± 0.04 0.02± 0.01 0.0002± 0.0001 0.25± 0.05 2.64± 0.53 5
( μ →) τ + N → τ – (→ e,μ,h) + X
Search track with large IP from τ decay,and no μ from PV
→ 5.1σ
Alessandra Pastore
Also limits on sterile neutrinos
MoriondEW, Mar 19, 2016 Experimental Summary
Short-baseline (reactor) neutrino experiments: Daya BayPowerful anti- e source from ß-decay of reactor fission products, detector now completed
measures θ13 from anti- e survival probability O(km) away from reactors, dominated by Δm2
32 term
Detection through anti- e + p → e+ + n reaction (IBD) in Gd doped liquid scintillators. Prompt e+ annihilation γ+ delayed 8 MeV γ’s from neutron capture. Flux uncertainty eliminated by measuring at 3 different detector sites
→ sin2(2θ13) =0.084 ± 0.005 (10/2012–11/2013 data, 2/3rd 8 ADs)
13θ22sin0 0.05 0.1 0.15
]2 e
V-3
| [10
ee2m
Δ|
1.5
2
2.5
3
Daya Bay: 621 days
99.7% C.L.
95.5% C.L.
68.3% C.L.
Best fit
2 χΔ 5
1015
2χΔ5 10 15
MINOS
T2K
[km/MeV]⟩νE⟨ / effL0 0.2 0.4 0.6 0.8
) eν → eν
P(
0.9
0.95
1EH1
EH2
EH3
Best fit
Yiming Zhang
May 2015
Layout of China-based Daya Bay experiment
Two near (effective baselines 512 m and 561 m) and one far (1.6 km) experimental area
17.4 GW total thermal power
MoriondEW, Mar 19, 2016 Experimental Summary
Weighted baseline [km]0 0.5 1 1.5 2
Mea
sure
men
t / P
redi
ctio
n
0.9
0.92
0.94
0.96
0.98
1
nH datanH best fitnGd datanGd best fitnH+nGd result
Daya Bay: 621 days
Short-baseline (reactor) neutrino experiments: Daya BayPowerful anti- e source from ß-decay of reactor fission products, detector now completed
measures θ13 from anti- e survival probability O(km) away from reactors, dominated by Δm2
32 term
Detection through anti- e + p → e+ + n reaction (IBD) in Gd doped liquid scintillators. Prompt e+ annihilation γ+ delayed 8 MeV γ’s from neutron capture. Flux uncertainty eliminated by measuring at 3 different detector sites
→ sin2(2θ13) =0.084 ± 0.005 (10/2012–11/2013 data, 2/3rd 8 ADs)
Layout of China-based Daya Bay experiment
Two near (effective baselines 512 m and 561 m) and one far (1.6 km) experimental area
17.4 GW total thermal power
Yiming Zhang
Brand new analysis using neutrons captured by hydrogen (instead of gadolinium). Independent data sample, different systematics
→ sin2(2θ13) =0.071 ± 0.011 (nH)
→ sin2(2θ13) =0.082 ± 0.004 (nGd & nH combined)
MoriondEW, Mar 19, 2016 Experimental Summary
Short-baseline (reactor) neutrino experiments: Double ChoozMulti-detector setup with ND (0.4 km, since 2015) & FD (1.1 km, since 2011)
New preliminary Double Chooz θ13 measurement with multi-detectors. Nearly iso-flux setup reduces flux uncertainty to < 0.1%. Uncorrelated detection systematic < 0.3%
Combined fit of parameters to FD-I, FD-II, ND data (reactor-off data also used for bkg constraint)
Layout of France based Double Chooz experiment
Two near (effective baselines 512 m and 561 m) and one far (1.6 km) experimental area
17.4 GW total thermal power
Masaki Ishitsuka
1322sin0 0.05 0.1 0.15 0.2 0.25
Double Chooz
Daya Bay
RENO
T2KCPArbitrary
JHEP 1410, 086 (2014)
PRL 115, 111802 (2015)
Preliminary (arXiv:1511.05849)
PRD 91, 072010 (2015) > 02
32 m
< 0232 m
Preliminary (Moriond)
→ sin2(2θ13) =0.111 ± 0.018 (stat + syst, 5.8σ from zero)
MoriondEW, Mar 19, 2016 Experimental Summary
A word on reactor flux anomaliesCannot currently follow-up new physics claims based on absolute reactor flux comparisons
reports recent measurement of anti- e flux using 340k candidates, better than 1% energy calibration, and comparison with model prediction: ~2.5σ overall deviation, ~4σ local deviation at E( e) ~ 5 MeV (shown to be due to reactor ). While an overall deficit may look like disappearance to sterile neutrino, the bump does not!
Consistent with “reactor neutrino anomaly” picture from earlier short baseline measurements (Daya Bay, Reno, Double Chooz): measured / expected anti- e flux ~ 0.94
Anna Hayes explained us that much caution is needed as various uncertainties may in total cover the deficit.
The ~5 MeV bump may be due to prominent fission daughter isotopes (eg, 238U or Plutonium)
In any case, new experiments needed: ~10 very-short baseline experimental projects, among which: SoLid →
En
trie
s / 2
50 k
eV
5000
10000
15000
20000Data
Full uncertainty
Reactor uncertainty
ILL+Vogel
Integrated
Rat
io t
o P
red
icti
on
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1
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1.2
(Hu
ber
+ M
uel
ler)
1
Prompt energy spectrum, Daya Bay,1508.04233, Aug 2015
Red prediction based on Hubert-Müller model, normalised to data
Prompt Energy (MeV)2 4 6 8 1
3 ton SoLid experiment deployed 5.5 m from the BR2 reactor core
Anna Hayes, Nick van Remortel
MoriondEW, Mar 19, 2016 Experimental Summary
Prompt Event Energy [p.e.]500 1000 1500 2000 2500 3000 3500
yea
r×
Eve
nts
/ 233
p.e
. / 9
07 to
n
0
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22 Data
Reactor neutrino
Best-fit U+Th with fixed chondritic ratio
U fit with free chondritic ratio
Th fit with free chondritic ratio
Neutrinos from the Sun: Borexino (LNGS)New measurements after the 2014 breakthrough evidence for primary pp fusion neutrinos
initially designed for measurement of 0.86 MeV Be-7 solar e’s via -e scattering and electron recoil measurement (also IBD)
270 t liquid scintillator, surrounded by 890 t buffer fluid; Installed in 9.5 m diameter nylon vessel, 1.3km underground
Extremely high radiopurity allows 250 keV threshold
Sandra Zavatarelli
“Money” plot published in 2014. Resulting pp neutrino flux consistent with photon luminosity within 10% precision
Since that measurement Borexino focused on:
Detection (proof) of “CNO” cycle in Sun
Tests of e-charge conservation (e → γ , ), giving τe > 6.6×1028 years
Detection of geo-anti- e (largest bkg reactors)
5.9σ observation
Syntheticpile-up
7Be
210Po CNO 85Kr
210Bi
pep 214Pb
Energy (keV)150 200 250 300 350 400 450 500 550
10–5
10–4
10–3
10–2
10–1
1
10
102
103
104
2/d.o.f. = 172.3/147
pp : 144 ± 13 (free) 210Po: 583 ± 2 (free)7Be : 46.2 ± 2.1 (constrained) 14C: 39.8 ± 0.9 (constrained)pep : 2.8 (fixed) Pile-up: 321 ± 7 (constrained) CNO : 5.36 (fixed) 210Bi: 27 ± 8 (free)214Pb: 0.06 (fixed) 85Kr: 1 ± 9 (free)
a
Eve
nts
(c.p
.d. p
er 1
00 t
per
keV
)
pp
14C
MoriondEW, Mar 19, 2016 Experimental Summary
measured over 11 orders of magnitude, but highest energy sources not well known
Neutrino astronomy with IceCubeIceCube studies astrophysical neutrino properties (and through atmospheric neutrinos also oscillation phenomena)
Neutrinos point back to their sources:
1.5–2.5 km deep in South Pole ice~1 km3 active volume in 86 stringsMeasures Cherenkov light”track” and “cascade” signatures~100k detected neutrinos / year (> 200 GeV) among which a few dozens astrophysical
TeV-scale muon (“track”) neutrino event superimposed on view of IceCube Lab
Jan Auffenberg
Characteristic signatures:
Direction ☺Energy res
Direction Energy res ☺
Direction ☺Energy res ☺
Large atmospheric μ and μ backgrounds
MoriondEW, Mar 19, 2016 Experimental Summary
Energy spectrum > 60 TeV after 4 years of data53 good events, up to ~2 PeV, 6.5σ signalHard spectrum. E –2 model may be too simple
Neutrino astronomy with IceCubeHighest energy neutrinos have lowest atmospheric neutrino background
IceCube Preliminary
PoS (ICRC2015) 1081
IceCube also sees 5.9σ excess of up-going μ (CC only) 0.2–8.3 PeV energy over atmospheric background (normalised at 100 TeV)
Possible pattern in spectral index vs energy
No significant point source
Jan Auffenberg
beheric neutrino background
C only) 0.2–8.3 PeV energy over atmospheric
Jan Auffenberg
PoS (ICRC2015) 1081
No significant clustering found
Shower-like events are marked with + and those containing tracks with ×
MoriondEW, Mar 19, 2016 Experimental Summary
Neutrino astronomy with IceCubeFlavour decomposition
Measurement of neutrino flavour can give hints about source of astrophysical neutrinos
Pion decay should produce e : μ: τ = 1 : 1 : 1 (at earth)
If muons suppressed (eg, due to large Bfields): 1 : 1.8 : 1.8 (earth)
If from neutron decay: 2.5 : 1 : 1 (earth)
But: no hint for (“double-bang”) tau neutrinos yet
Interesting, but insufficient data yet
→ Next generation IceCube-Gen2: ~10 km3 (R&D)
Jan Auffenberg, Gwenhae l de Wasseige
IceCube also now belongs to elite of experiments who have observed oscillation through μ disappearance: compatible Δm2
32, θ23 measurements
Also search for sterile neutrinos, heavy WIMP annihilation, solar flares
MoriondEW, Mar 19, 2016 Experimental Summary
Of which quantum nature are neutrinos ?Search for neutrinoless double beta decay (0 ββ) in 136Xe (EXO200) and 130Te (CUORE)
Γ0 ββ |M0 ββ|2 m2ββ→ observation would indicate:
Non-zero Majorana mass term( Heavy right-handed N might be responsible )Infer information on mass & hierarchy (theory input)
Experiments require: • large mass • high isotopic abundance • good energy resolution • high efficiency • low background
2 ββ 0 ββ (LFV)
Paolo Gorla, Yung-Ruey Yen
MoriondEW, Mar 19, 2016 Experimental Summary
Of which quantum nature are neutrinos ?Search for neutrinoless double beta decay (0 ββ) in 136Xe (EXO200) and 130Te (CUORE)
Γ0 ββ |M0 ββ|2 m2ββ→ observation would indicate:
Non-zero Majorana mass term( Heavy right-handed N might be responsible )Infer information on mass & hierarchy (theory input)
Experiments require: • large mass • high isotopic abundance • good energy resolution • high efficiency • low background
2 ββ 0 ββ (LFV)
Paolo Gorla, Yung-Ruey Yen
enriched (~81%) liquid-Xe TPC (136Xe → 136Ba + 2e–) installed in nuclear waste isolation plant in New Mexico, US.
bolometric technique using array of tellurium dioxide crystals (130Te → 130Xe + 2e–) cooled to ~10 mK! Good E resolution, no PID
Reconstructed Energy (keV)2470 2480 2490 2500 2510 2520 2530 2540 2550 2560 2570
Eve
nts
/ (2
keV
)
0
2
4
6
8
10
12
14
16
18/NDF = 43.9/462χ y
r))
⋅ k
g ⋅
Eve
nt R
ate
(cou
nts
/(ke
V
0
0.05
0.1
0.15
0.2
0.25
)σ(R
esid
ual
4−2−024
Qßß value (2528 keV)
9.8 kg·yr 130Te exposure
CUORE-0 + Cuoricino: <mββ> < (270–650) meV
2014 result using 100 kg·yr: <mββ> < (190–470) meV
Presented here new search for 2 ββ to excited 136Ba, which de-excites via 2 γ’s → MV analysis
MoriondEW, Mar 19, 2016 Experimental Summary
Nucleon decay — GUT messengers
Cannot reach expected GUT energy in Lab. Even Enrico Fermi’s Globatron(that was to be built in 1994) would with LHC technology “only” reach 20,000 TeV CM energy
MoriondEW, Mar 19, 2016 Experimental Summary
Messengers from GUT: baryon decayRemember: KamiokaNDE stands for Kamioka Nucleon Decay Experiment
presented new proton decay limits combining all SK I–IV data (1996–now)
Volodymyr Takhistov
No significant excess found, strong new limits:
τ(p → e+ π0) > 1.7 × 1034 years(no events seen in R1/2, 0.07/0.54 expected)
τ(p → μ+ π0) > 7.8 × 1033 years
(less sensitive because μ+ through decay to e+,0/2 events seen in R1/2, 0.05/0.82 expected, two events background like properties)
τ(p → K+ ) > 6.6 × 1033 years (K+ below Ch. threshold, detect through decays,no events seen in SB/C, 0.39/0.56 expected)
p → μ+ π0
p → e+ π0
Looked also for more exotic phenomena.
Order of magnitude sensitivity gain on p → e+ π0 expected from Hyper-K
MoriondEW, Mar 19, 2016 Experimental Summary
Direct Dark Matter Searches
DirectDetection
(DM collision nuclear recoils)
Effective scattering Lagrangian may have scalar (SI A2) or axial-vector (SD nuclear spin, no coherence) terms
Dominant background from electrons recoiling after X-ray or γ-ray interactions
MoriondEW, Mar 19, 2016 Experimental Summary
Direct Dark Matter Searches
Similar experimental challenges as for the elusive neutrinos
Deep underground
Excellent radio-purity
Shielding around active volume
Redundancy in signal detection
MoriondEW, Mar 19, 2016 Experimental Summary
Direct dark matter searches: CDMSliteHigh bias voltage signal amplification to gain sensitivity to lower WIMP masses
looks for keV-scale recoils from elastic scattering of WIMPs off target nuclei. Uses up to 19 Ge and 11 Si detectors placed in Soudan mine. Ionisation charges & phonons (heat) are measured and used to discriminate electron (ER*) from nuclear recoils (NR).
CDMSlite: operate 1 Ge detector at higher bias voltage to amplify the phonon signal.
Two runs. Second run had reduced acoustic noise (→ lower threshold) and increase exposure
CDMSlite
*ER from Compton scatters due to radioactive detector components, intrinsic ß decays, solar scattering off electrons
Elias Lopez Asamar
New parameter space excluded between 1.6–5.5 GeV DM mass
SuperCDMS now ended. Follow-up programme: SuperCDMS SNOLAB (2.1 km deep)
Exclusion limit assumes all events in signal region are WIMPs
MoriondEW, Mar 19, 2016 Experimental Summary
Direct dark matter searches: CRESST–IIImproved sensitivity to low-mass WIMPs: threshold is key
at LNGS uses cryogenic calcium tungstate (CaWO4) crystals to measure scintillation light and phonons to separate ERs from NRs. TES (~15 mK) and SQUID signal measurement & amplification.
Sub-keV energy thresholds and a high-precision energy reconstruction.
Combined with the light target nuclei, CRESST-II has potential to explore < 1 GeV dark matter particle
Franz Pröbst
Extends searches to sub-GeV range
Systematic studies still ongoing. Follow-up programme with 50–100 eV threshold starts in Apr 2016
MoriondEW, Mar 19, 2016 Experimental Summary
Direct dark matter searches: XENON1002nd phase of XENON DM experiment at LNGS running since 2009, predecessor of XENON1T
uses 61 (100) kg target (active veto) liquid-gas xenon filled TPC. High-density, high atomic number, sensitivity to spin-dependent interactions through ~50% odd isotopes, low threshold due to high ionization and scintillation yield, low backgrounds, self-shielding target. LXe scintillation light measured by PMTs. Light from prompt scintillation (S1) and delayed ionization (S2) allows to discriminate ER from NR.
Constanze Hasterok
2012/2013 results:
Recent result (2015) addresses DAMA’s periodic signal: XENON100 does not find significant periodicity, DAMA phase & amplitude excluded at 4.8σ; DAMA-like DM models excluded to at least 3.6σ
Follow-up programme XENON1T commissioning almost completed, first results expected this year
XENON10
CDMS
ZEPLIN−III
WIMP Mass [GeV/c2]
SD
WIM
P−
neut
ron
cros
s se
ctio
n [c
m2 ]
neutron
101
102
103
104
10−40
10−39
10−38
10−37
10−36
10−35
10−34
XENON100 limit (2013)± 2σ expected sensitivity± 1σ expected sensitivity
XENON10
CDMS
PICASSO
COUPP
SIMPLE
KIMS
IceCube (bb)
IceCube W+ W
−
WIMP Mass [GeV/c2]
SD
WIM
P−
prot
on c
ross
sec
tion
[cm
2 ]
proton
101
102
103
104
10−40
10−39
10−38
10−37
10−36
10−35
10−34
10−33 XENON100 limit (2013)
± 2σ expected sensitivity± 1σ expected sensitivity
]2WIMP Mass [GeV/c6 7 8 910 20 30 40 50 100 200 300 400 1000
]2W
IMP
-Nuc
leon
Cro
ss S
ecti
on [
cm
-4510
-4410
-4310
-4210
-4110
-4010
-3910
]2WIMP Mass [GeV/c6 7 8 910 20 30 40 50 100 200 300 400 1000
]2W
IMP
-Nuc
leon
Cro
ss S
ecti
on [
cm
-4510
-4410
-4310
-4210
-4110
-4010
-3910
]2WIMP Mass [GeV/c6 7 8 910 20 30 40 50 100 200 300 400 1000
]2W
IMP
-Nuc
leon
Cro
ss S
ecti
on [
cm
-4510
-4410
-4310
-4210
-4110
-4010
-3910
DAMA/I
DAMA/Na
CoGeNT
CDMS (2010/11)EDELWEISS (2011/12)
XENON10 (2011)
XENON100 (2011)
COUPP (2012)
SIMPLE (2012)
ZEPLIN-III (2012)
CRESST-II (2012)
XENON100 (2012)observed limit (90% CL)
Expected limit of this run:
expectedσ 2 ± expectedσ 1 ±
MoriondEW, Mar 19, 2016 Experimental Summary
Direct dark matter searches: LUXLiquid-Xe experiment at Sanford, South Dakota, US, 1.5 km underground
is very similar as XENON100 based on a dual-phase Xe target. LUX has larger active target and lower threshold (3 keV vs. 6.6 keV), ie, sensitivity to lower WIMP masses.
Reanalysis of 2013 data (95 live days, 145 kg fiducial mass) with improved calibration, event reconstruction and background modelling improving the sensitivity especially at low WIMP masses
Spin-independent
Paolo Beltrame
101
102
103
10−1
100
101
102
103
104
105
8B
SuperCDMS 2014
CDMSlite 2015
PandaX 2015
DarkSide−50 2015
XENON100 2012
LUX 2014
This Result
mWIMP
( GeV/c2 )
WIM
P−nu
cleo
n cr
oss
sect
ion
( zb
)
10−45
10−44
10−43
10−42
10−41
10−40
WIM
P−nu
cleo
n cr
oss
sect
ion
( cm
2 )
S1 (phd)0 5 10 15 20 25 30 35 40 45 50
[S2(
phd)
]10
log
2
2.5
3
3.5
4
3 9
1.7
15
2.9
21
4.2
27
5.4
33 keVnr
6.6 7.8 9.0 10.2 keVee
MoriondEW, Mar 19, 2016 Experimental Summary
)2WIMP Mass (GeV/c1 10 210 310 410 510
)2S
D W
IMP
-neu
tron
cro
ss-s
ectio
n (c
m
-4310
-4210
-4110
-4010
-3910
-3810
-3710
-3610
-3510
-3410
DAMA
ZEPLIN-IIICDMS
KIMS
MSDM g=0.25
MSDM g=1.45
PICASSO
XENON100
XENON10
LZ Projected
LUX 90% C.L.
)2WIMP Mass (GeV/c1 10 210 310 410 510
)2S
D W
IMP
-pro
ton
cros
s-se
ctio
n (c
m-4310
-4210
-4110
-4010
-3910
-3810
-3710
-3610
-3510
-3410
DAMA
ZEPLIN-IIICDMS
KIMSPICASSO
)bSuperK (b
)-W+SuperK (W)-τ+τ
SuperK (
PICO-2L PICO-60
XENON100
XENON10
LZ Projected
)b
IceCube (b
)-W+
IceCube (W
)-τ+
τIceCube (
LUX 90% C.L.
Direct dark matter searches: LUXLiquid-Xe experiment at Sanford, South Dakota, US, 1.5 km underground
is very similar as XENON100 based on a dual-phase Xe target. LUX has larger active target and lower threshold (3 keV vs. 6.6 keV), ie, sensitivity to lower WIMP masses.
LUX has also recently published spin-dependent limits using the same dataset
Spin-dependent elastic WIMP-proton scattering cross-sectionSpin-dependent elastic WIMP-neutron scattering cross-section
Paolo Beltrame
Follow-up programme LZ = LUX + ZEPLIN entering CD-2 review, start foreseen for 2025
MoriondEW, Mar 19, 2016 Experimental Summary
Direct dark matter searches: OutlookHealthy experimental programme in preparation with orders of magnitude improved sensitivity
] 2WIMP mass [GeV/c6 10 20 30 100 200 1000 2000 10000
]2W
IMP-
nucl
eon
Cro
ss S
ectio
n [
cm
4910
4810
4710
4610
4510
4410
4310
4210
4110
4010
3910DAMA/Na
DAMA/ICDMS-Si (2013)
XENON10 (2013)
SuperCDMS (2014) PandaX (2014)DarkSide-50 (2015)
XENON100 (2012) LUX (2015)
y)*
XENON1T (2 t
yXENON1T Sensitivity in 2 tExpected limit (90% CL)
expected 2 expected 1
*LUX2015 model
] 2WIMP mass [GeV/c6 10 20 30 100 200 1000 2000 10000
]2W
IMP-
nucl
eon
Cro
ss S
ectio
n [
cm
4910
4810
4710
4610
4510
4410
4310
4210
4110
4010
3910DAMA/Na
DAMA/ICDMS-Si (2013)
XENON10 (2013)
SuperCDMS (2014) PandaX (2014)DarkSide-50 (2015)
XENON100 (2012) LUX (2015)
y)*
XENON1T (2 t
y)*
XENONnT (20 t
yXENON1T Sensitivity in 2 tExpected limit (90% CL)
expected 2 expected 1
*LUX2015 model
] 2WIMP mass [GeV/c6 10 20 30 100 200 1000 2000 10000
]2W
IMP-
nucl
eon
Cro
ss S
ectio
n [
cm
4910
4810
4710
4610
4510
4410
4310
4210
4110
4010
3910DAMA/Na
DAMA/ICDMS-Si (2013)
XENON10 (2013)
SuperCDMS (2014) PandaX (2014)DarkSide-50 (2015)
XENON100 (2012) LUX (2015)
y)*
XENON1T (2 t
y)*
XENONnT (20 t
Billard et al., Neutrino Discovery limit (2013)
yXENON1T Sensitivity in 2 tExpected limit (90% CL)
expected 2 expected 1
*LUX2015 model
Next generation experiments may reach irreducible coherent –N scattering background limit
Example extrapolation from XENONnT
MoriondEW, Mar 19, 2016 Experimental Summary
Gravitational Waves
A new Popstarin science
MoriondEW, Mar 19, 2016 Experimental Summary
Gravitational Waves
LIGO Hanford site (Washington, US) LIGO Livingston (Louisiana, US)
A new Popstarin science
VIRGO (Cascina, Italy) — not operating in Sep 2015
… reporting on Feb 11th, 2016 an earthshattering measurement
MoriondEW, Mar 19, 2016 Experimental Summary
Gravitational Waves
MoriondEW, Mar 19, 2016 Experimental Summary
Gravitational Waves: LIGO / VIRGOHuge signal of binary black hole merger in LIGO, first noticed by online burst detection system
measurement is an example of scientific perseverance
(a)
(b)
Spin-2 GW lengthens one arm while shortening other and vice versa in laser interferometer
ΔL = δLx − δLy = h(t) L
Optical signal measured proportional to strain h(t)
Enhancements to basic Michelson interferometer:
Test mass mirrors multiply effect of GW on light phase by ~300
Power recycling mirror on input amplifies laser light
Output signal recycling broadens bandwidth
Isolation of test masses from seismic noise, low thermal noise. Vibration isolation of all components and vacuum to reduce Raleigh scattering
System of calibration lasers and array of environmental sensors Two (better three!) detectors to localise GW and measure polarisation
Alessio Rocchi
MoriondEW, Mar 19, 2016 Experimental Summary
Gravitational Waves: LIGO / VIRGOHuge signal of binary black hole merger in LIGO, first noticed by online burst detection system
Then, on Sep 14, 2015 at 09:51 UTC (11:51 am CEST) [total 16 days of simultaneous two-detector observational data]
H1 data shifted by 6.9 ms
Extremely loud event ( c = 23.6)
Maximum strain (10–21) times 4 km gives length deformation: 4×10–18 m ~ 0.5% size of proton
Measured spectrum well reproduced by GW calculation after fitting parameters
→ GW150914 (> 5.1σ over bkg)
Time series filtered with a 35–350 Hz bandpass filter to suppress large fluctuations outside the detectors’ most sensitive frequency band, and band-reject filters to remove the strong instrumental spectral lines seen on previous page
Times shown are relative to Sep 14, 2015 at 09:50:45 UTC
^
Alessio Rocchi
MoriondEW, Mar 19, 2016 Experimental Summary
Gravitational Waves: LIGO / VIRGOHuge signal of binary black hole merger in LIGO, first noticed by online burst detection system
GW150914
Over 0.2 s, frequency and amplitude increase from 35 to 150 Hz (~8 cycles)
To reach 75 Hz orbital frequency, objects need to be very close ~350 km and massive (→ black holes)
Two black holes of initially 36 and 29 solar masses (M ) inspiral with ~half c
The black holes merge within tens of ms
Inspiral, merging and ringdown leave characteristic amplitude and frequency gravitational wave pattern
Total radiated GW energy 3.0 ± 0.5 M
It’s direct observation follows upon the demonstration of GW from energy loss in binary pulsar systems (1982)
Alessio Rocchi
MoriondEW, Mar 19, 2016 Experimental Summary
Gravitational Waves: LIGO / VIRGOHuge signal of binary black hole merger in LIGO, first noticed by online burst detection system
Observation of GW150914 bundles several discoveries:
First direct detection of GWs
First observation of binary black hole merger
Relatively heavy stellar-mass black holes (> 25 M ) exist in nature
Observation of ”no-hair-conjecture”
Most relativistic binary event seen (v/c ~ 0.5)
Limit on graviton mass (< 1.2×10–22 eV)
Likely not a unique BBH event: inferred rate 2–400 Gpc–3 yr–1 at higher end of predictions
Adding VIRGO will improve localisation of GW; new interferometers upcoming in India & Japan
EM and high-E follow-up programme (no HEN coincidence seen by ANTARES and IceCube)
Alessio Rocchi
MoriondEW, Mar 19, 2016 Experimental Summary
Gravitational Waves: LIGO / VIRGOHuge signal of binary black hole merger in LIGO, first noticed by online burst detection system
Observation of GW150914 bundles several discoveries:
First direct detection of GWs
First observation of binary black hole merger
Relatively heavy stellar-mass black holes (> 25 M ) exist in nature
Most relativistic binary event seen (v/c ~ 0.5)
Best limit on graviton mass (< 1.2×10–22 eV)
Likely not a unique BBH event: inferred rate 2–400 Gpc–3 yr–1 at higher end of rate predictions
Adding VIRGO will improve localisation of next observation; new interferometers upcoming in India & Japan
EM and high-E follow-up programme (no HEN coincidence seen by ANTARES and IceCube)
Observation of GW150914 bundles severaldiscoveries:
First direct detection of GWs
First observation of binary black hole merger
Relatively heavy stellar-mass black holes (> 25 MMM ) exist in nature
Most relativistic binary event seen (v/vv c ~ 0.5)
Best limit on graviton mass (< 1.2×10–22 eV)
Likely not a unique BBH event: inferred rate 2–400 Gpc–3 yr–1 at higher end of rate predictions
Adding VIRGO will improve localisation of nextobservation; new interferometers upcoming in India & Japan
EM and high-E follow-up programme (no HENcoincidence seen by ANTARES and IceCube)
Gravitational waves joined the club for multi-messenger astronomy together with photons, cosmic rays, neutrinos
PRL116, 061102 (2016): Huge impact paper: >100 citations within 1 monthcf: ATLAS/CMS July 2012 Higgs discovery papers have > 5600 citations by now
LIGO/Virgo published (so far) 12 follow-up papers about detector & analysis details and implications of GW150914
Alessio Rocchi
MoriondEW, Mar 19, 2016 Experimental Summary
Every galaxy is expected to host supermassive black holes with > 1M sun masses in its centre, formed during galaxy creation process
NGC 4889, the brightest elliptical galaxy in the Coma cluster (94 Mpc ~ 300 Mly from earth), hosts a record BH of 21 billion times mass of Sun, event horizon diameter of ~130B km (Sun: 1.4M km)
From NASA/ESA Hubble Space Telescope, 11 Feb 2016https://www.spacetelescope.org/news/hei c1602
MoriondEW, Mar 19, 2016 Experimental Summary
Flavour Physics
(Heavy) flavour physics
Study flavour mixing & CP violation in all its aspects
Look for new physics far beyond the current energy frontier in rare and forbidden processes
By these measurements we hope to get insight into the mystery of the observed flavour structure (which is related to Higgs sector)
The cavern in the North Area shortly before the NA62/2 run in autumn 2014
MoriondEW, Mar 19, 2016 Experimental Summary
)2 cC
and
idat
es /
( 1
MeV
/0
50
100
150
200
250
300Claimed X(5568) state
Combinatorial
LHCb Preliminary
Pu
ll
-4-2024
]2c) [MeV/±πs0m(B
5520 5540 5560 5580 5600 5620 5640 5660 5680 5700
Hadron zoo: XYZ mesonsTopic of Moriond QCD, only this much…
announced new state in m(Bs(→J/ φ) π±) spectrum which may be a tetra-quark (bsud) [ 1602.07588, Feb 2016 ]
π π
Picture from Stephen Lars Olsen, La Thuile 2016
5.5 5.55 5.6 5.65 5.7 5.75 5.8 5.85 5.90
20
40
60
80
100
120
140
]2 ) [GeV/c S0 (Bm
2 )
/ 20
MeV
/c S0
N (
B
-1 D0 Run II, 10.4 fb
did not confirm the observation in 20 times larger Bs sample. Upper limit on ρ ~ 1%, but this may depend on beam/energy/ analysis. No public material yet, but more informa-tion expected this week.
mX ~ 5568 MeVΓX ~ 22 MeV
ρ(X→Bs /Bs) ~ 5–12%
Jeroen van Tilburg
Other experiments are also looking
MoriondEW, Mar 19, 2016 Experimental Summary
The CKM matrix and moreLong-term effort to overconstrain CKM matrix continues. Huge contributions from LHCb
dmK
K
sm & dm
ubV
sin 2
(excl. at CL > 0.95) < 0sol. w/ cos 2
excluded at CL > 0.95
-1.0 -0.5 0.0 0.5 1.0 1.5 2.0-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5excluded area has CL > 0.95
EPS 15
CKMf i t t e r
Jeroen van Tilburg
LHCb reported:
|Vub / Vcb| from Λb → pμ at 5% precision (closer to exclusive B-factory result)
World’s best single Δmd measurement: 0.5050 ± 0.0021± 0.0010 ps–1
(B-factories: σave = 0.005 ps–1)
Precision on sin(2 ) approaches that of B-factories: 0.73 ± 0.04 ± 0.02
World’s best constraints on CP violation in B0
(s) mixing (asls, asl
d) in agreement with SM (D0 sees 3.6σ deviation)
Search for CPT violation (difference in mass or width) in B0
(s) system, measurement of sidereal phase dependence of CPT violating parameter
(tree) together with sin(2ß) (mix) or |Vub| (tree), fixes the unitarity triangle. All other measurements probe these two.
MoriondEW, Mar 19, 2016 Experimental Summary
The CKM matrix and moreHuge LHCb effort on CKM angle γ
can be measured through interference of b → u with b → c tree transitions
Malcolm John
b
u
c
u
W− s
u
B− D0
K−b
u
u
u
W−
s
c
B−
K−
D0
Hadronic parameters are: rB and strong FSI phase δB
Theoretically clean measurement, but large statistics needed due to CKM suppression of amplitudes.
Hence use B±, B0, Bs, and many D decay modes requiring different techniques; also DK* and DsK used. Some modes show large CP asymmetries (example below)
ADS: B±→ Dh±, D→ π+K–
5100 5200 5300 5400 5500
)
2 cE
vent
s / (
10
MeV
/
50
100
KD]+K[B
LHCb
5100 5200 5300 5400 5500
0
0
+KD]K+[+B
LHCb
8σ
5100 5200 5300 5400 5500] 2c) [MeV/Dh(m
5100 5200 5300 5400 5500
]° [γ
1-C
L
0
0.2
0.4
0.6
0.8
1
0 50 100 150
68.3%
95.5%
LHCbPreliminary
Bs
decays
B0
decays
B+ decays
Com
bina
tion
γcombined = 71 deg+7– 8
CKM fit: 68 ± 2 deg(γ measurement not in fit)
MoriondEW, Mar 19, 2016 Experimental Summary
Charm @ LHCb: CP violation and mixingExploiting huge recorded charm sample from Run-1
mixing frequency extremely low, challenging high-statistics measurement, CP violation small in SM
New mixing analysis using D0 → K– π+ π– π+. Sensitive to strong phase difference needed for γmeasurement via B+ → D0K+ (with D0 → K– π+ π– π+)
R(t) ≈ (rK3πD
)2 − rK3πD RK3π
D · y′K3π
t
τ+
x2 + y2
4
(t
τ
)2WS D0 → K+ π– π+ π–
––– (t) = –––––––––––––– (t) =RS D0 → K– π+ π– π+
sensitive to mixing, to ratio of CF to DCS amplitudes and their interference (strong phase δ)
τt /2 4 6 8 10 12
WS/
RS
3
3.5
4
4.5
5
5.5
63−10×
LHCb
DataUnconstrained fitNo-mixing fit
Using 11.4M RS, 43k WS
Confirms charm mixing
Taking x, y from WA, allows to measure RK3π
D · y′K3πrK3πD R
Alex Pearce
&
New results were shown for CP violation in charm:
ΔACP = ACP(D0/D0 → K+K–) – ACP(D0/D0 → π+π–)
D0 flavour inferred from soft pion charge in: D*+ → D0 π+
Earlier 0.6 fb–1 result exhibited 3.5σ discrepancy with SM, not confirmed with larger data sample.
New, full 3 fb–1 result:
ΔACP = −0.10 ± 0.08stat ± 0.03syst %
– –
MoriondEW, Mar 19, 2016 Experimental Summary
Rare B decaysBs → μμ decay unambiguously observed by CMS & LHCb in Nov 2014 using Run-1 dataset
Relatively precise SM prediction, measurable branching fraction
Long search before it was finally observed
B0s
X+
W−X0
t
b
s
μ+
μ−
B0s
W+
W−Z0
t
b
s
μ+
μ−
Year1985 1990 1995 2000 2005 2010 2015
BR
UL(
95%
CL)
or
mea
sure
men
t
-1010
-910
-810
-710
-610
-510
-410
-μ+μ → 0sSM: B
-μ+μ → 0SM: BBelleL3CDFUA1CLEOARGUS
ATLASCMSLHCbD0BABAR
2011 2012 2013 2014
-910
-810
-710EPS2013
Johannes Albrecht, Sanjay Kumar Swain
MoriondEW, Mar 19, 2016 Experimental Summary
Rare B decaysBs → μμ decay unambiguously observed by CMS & LHCb in Nov 2014 using Run-1 dataset
Relatively precise SM prediction, measurable branching fraction
B0s
X+
W−X0
t
b
s
μ+
μ−
B0s
W+
W−Z0
t
b
s
μ+
μ−
]2c [MeV/−μ+μm5000 5200 5400 5600 5800
)2 cS
/(S
+B
) w
eigh
ted
cand
. / (
40 M
eV/
0
10
20
30
40
50
60 DataSignal and background
−μ+μ →s0B
−μ+μ →0BCombinatorial bkg.Semileptonic bkg.Peaking bkg.
CMS and LHCb (LHC run I)
SM
0BS0 1 2 3 4 5 6 7 8 9
Lln
Δ2−
0
2
4
6
8
10SM
c
SMs0B
S0 0.5 1 1.5 2 2.5
Lln
Δ2−
0
10
20
30
40SM
b
B → μμ
Bs → μμ
B(Bs → μμ) = 2.8 × 10–9 (6.2σ) | SM: 3.7 ± 0.2 × 10–9
B(B → μμ) = 3.9 × 10–10 (3.2σ) | SM: 1.1 ± 0.1 × 10–10
+0.7–0.6
CMS & LHCb combined:
+1.6–1.4
Johannes Albrecht, Sanjay Kumar Swain
MoriondEW, Mar 19, 2016 Experimental Summary
Rare B decaysPreliminary Run-1 Bs → μμ search presented at this conference by ATLAS
Features:
BDT to suppress hadrons faking muons (fight peaking backgrounds)
BDT to suppress continuum background
2D fit to cont. BDT bins & m (μμ) (unbinned)
Event yield normalised to B+ → J/ K+ (input: fs /fd)
Control channels: B+ → J/ K+ and Bs → J/ φ
3.1σ expected significance for Bs → μμ [SM]
BR(Bs → μμ) = 0.9 × 10–9
< 3.0 × 10–9 (95% CL)
BR(B → μμ) < 4.2 × 10–10 (95% CL)
+1.1–0.8
Compatibility with SM: 2.0σ
Sandro Palestini
di-muon mass [MeV]
4800 5000 5200 5400 5600 5800
Eve
nts
/ 40
MeV
0
5
10
15
20
25
30
35
40 2011-2012 dataTotal fitCombinatorial bkgSS-SV bkg
+ sB
PreliminaryATLAS
-1= 7 TeV, 4.9 fbs-1= 8 TeV, 20 fbs
0.346 < BDT < 0.446
di-muon mass [MeV]
4800 5000 5200 5400 5600 5800
Eve
nts
/ 40
MeV
0
2
4
6
8
10
12
14
16
18 2011-2012 dataTotal fitCombinatorial bkgSS-SV bkg
+ sB
PreliminaryATLAS
-1= 7 TeV, 4.9 fbs-1= 8 TeV, 20 fbs
0.446 < BDT < 1.000
MoriondEW, Mar 19, 2016 Experimental Summary
Flavour anomaliesb → s μ+μ– continues to produce interesting results, more channels added
showed results with full angular analyses for K*μμ (8 independent CP-averaged observables). Best experimental precision on AFB, FL, …
Also angular and diff. BR analysis of Bs → φμμ, and diff. BR analysis of B+ → K+μμ
Johannes Albrecht
b sW
γ, Z0
t μ−
μ+
b s
μ+
μ−
di
H0
g
Use ratio to cancel FF dependence: Full Run-1 dataset and new analysis confirms discrepancy
]4c/2 [GeV2q0 5 10 15
5'P
-2
-1
0
1
2LHCb
SM from DHMV
Global fit with new physics parameterisation (C9NP, C10
NP) seems to reproduce observed discrepancy pattern
]4c/2 [GeV2q5 10 15
]4 c-2
GeV
-8 [
102 q
)/d
μμ
φ→ s0
BdB
( 0
1
2
3
4
5
6
7
8
9
SM pred.SM (wide)SM LQCDDataData (wide)
LHCb
Differential branching ratio of Bs → φμμ decay
P’5 measurements from ATLAS & CMS in work
MoriondEW, Mar 19, 2016 Experimental Summary
Flavour anomaliesLess plagued by hard to estimate theoretical uncertainties are lepton universality tests
measure ratios of semileptonic B decays. Robust SM predictions
Johannes Albrecht, Pablo Goldenzweig
]4c/2 [GeV2q0 5 10 15 20
KR
0
0.5
1
1.5
2
SM
LHCbLHCb
LHCb BaBar Belle
R(D)0.2 0.3 0.4 0.5 0.6
R(D
*)
0.2
0.25
0.3
0.35
0.4
0.45
0.5BaBar, PRL109,101802(2012)Belle, arXiv:1507.03233LHCb, arXiv:1506.08614Average
= 1.02χΔ
SM prediction ) = 55%2χP(
HFAG
Prel. EPS2015
New measurement by Belle using semileptonic tagging of recoil B:
RD* = 0.302 ± 0.030stat ± 0.011syst [SM: 0.252 ± 0.003, 1.6σ]
Also studied kinematic distributions (additional NP sensitivity)
HFAG: p-value for SM: 3.9σ
Belle semilep.
MoriondEW, Mar 19, 2016 Experimental Summary
Charged lepton flavour violation: SM-free signals!A very active field of BSM searches
1940 1960 1980 2000 2020
Year
90%
–CL
boun
d
10–14
10–12
10–10
10–8
10–6
10–4
10–2
100
μ eγ
μ 3e
μN eN
τ μγ
τ 3μ
Only null observation to date
Mar
cian
o et
al.,
Ann
u. R
ev.
Nuc
l. P
art.
Sci
.58,
315
(20
08),
up
dat
ed
MoriondEW, Mar 19, 2016 Experimental Summary
Charged lepton flavour violationNew analysis of NA48/2 2003–2004 data sample to search for lepton number violation
looked for the decay: K+ → π– μ+ μ+ (negligible contribution from SM or neutrino oscillation expected)
Karim Massri
Main background from K+ → π– π+ π+ with 2 π+ → μ+ decays
Total of 2×1011 K± decays in fiducial detector volume
± π μ±μ± ×
M
o
No excess observed. Strong 90% CL limit:
BR(K+ → π– μ+ μ+ ) < 8.6 ×10–11
Also looked into di-muon invariant mass of opposite sign K+ → π+ μ+ μ– sample for resonances. None seen.
Outlook for NA62: expect to reach 10–12
LFV sensitivity (and 10–11 for π0 → eμ)
MoriondEW, Mar 19, 2016 Experimental Summary
Rare kaon decays: NA62New result on 2007 dataset and /2 is ramping up
presented new measurement on 2007 dataset:
π0
γ
γ
e−
e+F (x)
− pe−)
x)
mπ0)2 ≡ xmin):
≈ 1 + a x + …F(x)
(in timelike region)π0, η, η′
x0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Eve
nts
/ 0.0
1
10
210
310
410
510Data
D0π ±π → ±K
ν±μ D0π → ±K
NA62Preliminary
~1.1 M fully reconstructed
Dalitz π0
TFF slope0π0.1− 0.05− 0 0.05 0.1
Geneva-Saclay (1978)
Saclay (1989)
SINDRUM I @ PSI (1992)
TRIUMF (1992)
NA62 (2016)
30k eventsFischer et al.
32k eventsFonvieille et al.
54k eventsMeijer Drees et al.
8k eventsFarzanpay et al.
1M events(preliminary)
aNA62 = (3.70 ± 0.53stat
± 0.36syst) × 10–2
Measurement of timelike transition form-factor (TFF) slope with π0 → e+e–γDalitz decays (1.2% BR) using ~5B triggered π0 from K±→ π±π0 (~20B K± in decay region)
TFF important to model muon g–2 LBLS contribution (other experimental information from spacelike measurements of e+e– → e+e–γ*γ* → e+e–π0 by CELLO, CLEO, BABAR)
Challenge for F(x) extraction: rad. corrections (included in MC)
F(x) fit using MC templates
Giuseppe Ruggiero
MoriondEW, Mar 19, 2016 Experimental Summary
towards a measurement of K+ → π± (SM: (8.4 ± 1.0) × 10–11, BNL E949: (17 ± 11) × 10–11) Additional physics goals: standard kaon physics and new physics searches
Goal: 10% K+ → π± BR measurement
Requirements: 5 trillion K+ decays (~50 signal events) / year (possibly already in 2016)
similar order for background suppression (< 10 events / year, dominated by K+ → π±π0)
Rare kaon decays: NA62/2Eagerly awaited results on K+ → π± are on their way. 2014/15 data for commissioning
]4/c2 [GeVmiss2m
-0.04 -0.02 0 0.02 0.04 0.06 0.08 0.1 0.12
mis
s2
dmΓd
to
tΓ1
-710
-610
-510
-410
-310
-210
-110
1
)γ(μν+
μ→+K
eν0π+ e→+
K
μν0π+μ→+K
)γ(0π+π→+K
)1010× (νν+π→
+K
-π+π+π→+K0π0π+π→+
K
eν+e-π+
π→+K
Reg
ion
I
Region II
Most sensitive variable: m2miss = (pK+ – pπ+)2
PIDPhoton rejection
Giuseppe Ruggiero
K decay
2015 dataOTS + Kaon ID + Vertex cut
Region I
Reg
ion
II
Clo
se to
des
ign
per
form
ance
MoriondEW, Mar 19, 2016 Experimental Summary
Electroweak precision physics
The LHC experiments —as do D0 & CDF since long, and continuing —are investing efforts into precision measurements of EW observables: mW, mtop, sin2θW
All are very challenging
[GeV]tm140 150 160 170 180 190
[G
eV]
WM
80.25
80.3
80.35
80.4
80.45
80.568% and 95% CL contours
measurementst and mW
fit w/o M measurements
H and M
t, m
Wfit w/o M
measurementst and mW
direct M
1 world comb. WM 0.015 GeV = 80.385 WM
1 world comb. tm = 173.34 GeVtm
= 0.76 GeV GeV theo 0.50 = 0.76
= 125.14 GeV
HM = 50 G
eV
HM = 300 G
eV
HM = 600 G
eV
HMG fitter SM
Jul ’14
MW = 80.3584± 0.0046mt ± 0.0030δtheomt ± 0.0026MZ± 0.0018Δαhad
± 0.0020αS ± 0.0001MH± 0.0040δtheoMW
GeV ,
= 80.358± 0.008tot GeV .
sin2θeff = 0.231488± 0.000024mt ± 0.000016δtheomt ± 0.000015MZ± 0.000035Δαhad
± 0.000010αS ± 0.000001MH± 0.000047
δtheo sin2θfeff
,
= 0.23149± 0.00007tot ,
SM Predictions [1407.3792, EW fit]
The LHC Run-1 is not over yet: high-quality, extremely well understood data sample for precision measurements
[ exp WA: σ = 15 MeV ]
[ exp WA: σ = 0.00016 ]
Global electroweak fit was masterpiece of LEP/SLD era. Discovery of Higgs over-constrains the fit and
dramatically improves predictability
MoriondEW, Mar 19, 2016 Experimental Summary
[pb]tt
σ
50 100 150 200 250 300 350
ATLAS+CMS Preliminary = 7 TeV s summary, tt
σ
(*) Superseded by results shown below the line
WGtopLHC Mar 2016
NNLO+NNLL PRL 110 (2013) 252004, PDF4LHC = 172.5 GeVtopm
scale uncertainty
uncertaintySα ⊕ PDF ⊕scale
total stat
(lumi)±(syst) ±(stat) ± tt
σ
Effect of LHC beam energy uncertainty: 3.3 pb (not included in the figure)
ATLAS, l+jets -1=0.7 fbintL 7 pb± 9 ± 4 ±179
ATLAS, dilepton (*) -1=0.7 fbintL pb 7− 8+ 11−
14+ 6 ±173
ATLAS, all jets (*) -1=1.0 fbintL 6 pb± 78 ± 18 ±167
ATLAS combined -1=0.7-1.0 fbintL 7 pb± 7− 8+ 3 ±177
CMS, l+jets (*) -1=0.8-1.1 fbintL 7 pb± 12 ± 3 ±164
CMS, dilepton (*) -1=1.1 fbintL 8 pb± 16 ± 4 ±170
(*)μ+hadτCMS, -1=1.1 fbintL 9 pb± 26 ± 24 ±149
CMS, all jets (*) -1=1.1 fbintL 8 pb± 40 ± 20 ±136
CMS combined -1=0.8-1.1 fbintL 8 pb± 11 ± 2 ±166
LHC combined (Sep 2012) -1=0.7-1.1 fbintL 6 pb± 8 ± 2 ±173
νμX→ATLAS, l+jets, b -1=4.7 fbintL 3 pb± 17 ± 2 ±165
, b-tagμATLAS, dilepton e -1=4.6 fbintL 3.6 pb± 4.2 ± 3.1 ±182.9
missT-E
jets, NμATLAS, dilepton e -1=4.6 fbintL 3.3 pb± 9.5−
9.7+ 2.8 ±181.2
+jetshadτATLAS, -1=1.7 fbintL 46 pb± 18 ±194
ATLAS, all jets -1=4.7 fbintL 7 pb± 57− 60+ 12 ±168
+lhadτATLAS, -1=4.6 fbintL 3 pb± 23 ± 9 ±183
CMS, l+jets -1=5.0 fbintL 3.6 pb± 12.0 ± 6.0 ±161.7
μCMS, dilepton e -1=5.0 fbintL 3.8 pb± 4.0− 4.5+ 2.1 ±173.6
+lhadτCMS, -1=2.2 fbintL 3 pb± 22 ± 14 ±143
+jetshadτCMS, -1=3.9 fbintL 3 pb± 32 ± 12 ±152
CMS, all jets -1=3.5 fbintL 3 pb± 26 ± 10 ±139
(GeV)+lψJ/M0 50 100 150 200 250
Eve
nts
/ ( 1
0 G
eV )
0
20
40
60
80
100
3.04) GeV± = (173.53 tM
+ Jets channelμ/eμμ/ee/μe/
PreliminaryCMS (8 TeV)-119.7 fb
(GeV)tM170 180
)m
ax-lo
g(L/
L0
1
2
3
4
Traditional kinematic top mass measurement method approaches systematic limit of b-quark hadronisation
Ways to improve (lot of pioneering work by CMS):
Choose more robust observables (eg, wrt. b fragmentation)
Electroweak precision measurementsTop mass from LHC and Tevatron
Benjamin Stieger
LHC kinematic top mass measurements:
Select charmed mesons (rare but very clean signature)
Use dilepton kinematic endpoint (clean but large theoretical uncertainties)
Use cross-sections or differential variables (promising but difficult to achieve competitive precision
Currently best result (CMS): 1.7 GeV uncertainty
We heard a beautiful talk about alternative methods to measure the top mass
MoriondEW, Mar 19, 2016 Experimental Summary
have extracted weak mixing angle from Z/γ* asymmetry measurements
Uncertainties at Tevatron dominated by statistical uncertainties, LHCb equally, ATLAS & CMS by PDF uncertainties.
Data-driven “PDF replica rejection” method applied by CDF
Complex measurements (in particular physics modelling) that are important to pursue, but precision of hadron colliders not yet competitive with LEP/SLD
Electroweak precision measurementssin2θW and Z asymmetries from hadron colliders
Arie Bodek, William James Barter
effWθ
2sin
0.224 0.226 0.228 0.23 0.232 0.234effWθ
2sin
0.224 0.226 0.228 0.23 0.232 0.234
0.0002±0.2315
0.0003±0.2322
0.0003±0.2310
0.0005±0.2315
0.0010±0.2315
0.0012±0.2308
0.0032±0.2287
0.0011±0.2314
0.0015±0.2329
0.0012±0.2307
LEP + SLD
(b)FBLEP A
LRSLD A
D0
CDF
ATLAS
CMS
LHCb
=7TeVsLHCb
=8TeVsLHCb
Phys. Rept. 427 (2006) 257
Phys. Rept. 427 (2006) 257
Phys. Rev. Lett. 84 (2000) 5945
Phys. Rev. Lett. 115 (2015) 041801
Phys. Rev. Lett. D89 (2014) 072005
arXiv:1503:03709
Phys. Rev. Lett. D84 (2011) 112002
+ Newest CDF result: 0.23221 ± 0.00046
Figure from LHCb 1509.07645
MoriondEW, Mar 19, 2016 Experimental Summary
have presented progress towards the (challenging) mW measurement at the LHC
Measurement relies on excellent understanding of final state
Observables: pT, , pT, , mT as probes of mW
Challenges, high-precision:
Momentum/energy scale (incl. had. recoil) calibration: Z, J/ , Y
Signal efficiency and background modelling
Physics modelling:
o Production governed by PDF & initial state interactions (pert & non-pert): use W+, W–, Z, W+c data for calibration, and NNLO QCD calculations + soft gluon resummation
o EW corrections well enough known
o Probes very sensitive to W polarisation (and hence to PDF, including its strange density)
Electroweak precision measurementsW mass: towards a first measurement at the LHC via decay to lepton + neutrino
Mariarosaria D'Alfonso
0
0.25
0.5
0.75
1
80.2 80.3 80.4 80.5 80.6
Entries 0
80.2 80.6MW[GeV]
ALEPH 80.440±0.051
DELPHI 80.336±0.067
L3 80.270±0.055
OPAL 80.415±0.052
LEP2 80.376±0.033χ2/dof = 49 / 41
CDF 80.389±0.019
D0 80.383±0.023
Tevatron 80.387±0.016χ2/dof = 4.2 / 6
Overall average 80.385±0.015
Current experimental picture for mW
Project: Experiments are in a vigorous process of addressing the above issues. Many precision measurements (differential Z, W + X cross sections, polarisation analysis, calibration performance, …) produced on the way. Also theoretical developments mandatory. Long-term effort.
MoriondEW, Mar 19, 2016 Experimental Summary
presented a new m(Z) measurement using a W-like Z → μμ analysis (replacing one μ by recomputed MET)
Electroweak precision measurementsW mass: towards a first measurement at the LHC via decay to lepton + neutrino
Mariarosaria D'Alfonso
Proof-of-principle analysis, but differences with full m(W) analysis remain: event selection, background treatment and of most of the theory uncertainties, …
7 TeV dataset used (lower pileup)
Scale and resolution calibration relies on J/ & Y
Track-based MET
W transverse recoil calibrated using Z+jets events
Results (depending on observable used):
Statistical errors: 35–46 MeV
Total systematics: 28–34 MeV
QED radiation: ~23 MeV (dominant)
Lepton calibration: 12–15 MeV
LEP
MoriondEW, Mar 19, 2016 Experimental Summary
The LHC at 13 TeV
Huge milestone achieved in 2015 with record proton–proton collision energy of 13 TeV
After a rocky start, the LHC delivered Lint = 4.2 fb–1, Lpeak = 5.0×1033 cm–2 s–1
This luminosity already increase the new physics reach for many searches
Great year for experiments with many results available for the summer conferences, and a huge amount for the end-of-year jamboree, and much more at this conference
Expect 1×1034 cm–2 s–1 and ~30 fb–1 in 2016
Jörg Wenninger
MoriondEW, Mar 19, 2016 Experimental Summary
l t0
500
1000
1500
2000
2500
3000
3500
4000
4500
Tota
l In
teg
rate
d L
um
inosit
y (
pb
¡1)
Preliminary Offline Luminosity
LHC Delivered: 4012.95 pb¡1
CMS Recorded: 3610.95 pb¡1
0
500
1000
1500
2000
2500
3000
3500
4000
4500
Day in 2015
27/05 28/06 30/07 31/08 02/10 04/11
]-1
Tot
al In
tegr
ated
Lum
inos
ity [f
b
0
1
2
3
4
5
6 = 13 TeVs ATLAS Online Luminosity
LHC Delivered
ATLAS Recorded
-1Total Delivered: 4.34 fb-1Total Recorded: 4.00 fb
Peak luminosity:
Lmax = 5.2 × 1033 cm–2 s–1
2015 LHC proton–proton luminositiesMost results reported at this conference use total 2015 datasets
LHCb after luminosity levelling: 0.32 (0.36) fb–1 recorded (delivered)
Luminosity monitors calibrated with beam-separation scans. Current precisions: 5.0% (ATLAS), 2.7% (CMS), 3.8% (LHCb)
Pileup profiles: ATLAS/CMS: <μ>50 ns = 20, <μ>25 ns = 13 (<μ>8TeV = 21), LHCb: <μ> ~ 1.7
Total in 2015 (recorded): B = 3.8 T: 2.9 fb–1
B ≠ 3.8 T: 0.8 fb–1
(due to problem with cryogenic supply)
3.3–3.6 fb–1 for physics 2.3–3.3 fb–1 for physics
Jörg Wenninger
MoriondEW, Mar 19, 2016 Experimental Summary
SM and Top Physics
Celebrated last year at Moriond EW the 20th anniversary of the top discovery at the Tevatron
Dimuon mass distribution collected with various dimuon triggers by CMS
CDF plot
MoriondEW, Mar 19, 2016 Experimental Summary
Inclusive W and Z productionVery rich physics: strong PDF dependence, probes for QCD, precision electroweak physics
studied single gauge boson production at 7, 8, 13 TeV, LHCb covers complementary phase space in x, Q2
William James Barter
-Wfidσ / +W
fidσ1.15 1.2 1.25 1.3 1.35
ATLAS Preliminary-113 TeV, 85 pb
total uncertaintystat. uncertainty
ABM12LHCCT10nnloNNPDF3.0MMHT14nnlo68CL
-Wfidσ / +W
fidσ = -/W+WR
Zfidσ / ±W
fidσ9 9.2 9.4 9.6 9.8 10 10.2 10.4 10.6 10.8
ATLAS Preliminary-113 TeV, 85 pb
total uncertaintystat. uncertainty
ABM12LHCCT10nnloNNPDF3.0MMHT14nnlo68CL
Zfidσ / ±W
fidσ = W/ZR
10.0 10.5 11.0
Preliminary CMS (13 TeV)-143 pb
Theory: FEWZ (NNLO)
Observation: NNPDF3.0
Observation
Uncertainty
(inner uncertainty: PDF only)
Ztotσ/W
totσ
NNPDF3.0-0.06+0.0710.55
CT14-0.09+0.0910.55
MMHT2014-0.09+0.0810.53
ABM12LHC-0.02+0.0410.56
HERAPDF15-0.09+0.1110.61
1.25 1.30 1.35 1.40
Preliminary CMS (13 TeV)-143 pb
Theory: FEWZ (NNLO)
Observation: NNPDF3.0
Observation
Uncertainty
(inner uncertainty: PDF only)
-Wtotσ/+W
totσ
NNPDF3.0-0.012+0.0111.354
CT14-0.014+0.0141.350
MMHT2014-0.008+0.0111.348
ABM12LHC-0.004+0.0031.371
HERAPDF15-0.013+0.0141.353
Note: fiducial cross-section ratios Note: fiducial cross-section ratios
Leptonic decays of Z & W are also standard candles to verify and calibrate e/μ performance
13 TeV W/Z cross section measurements (→ right plots)
pT(Z) @ 8 TeV from ATLAS shows resummation needed at low pT to describe data, NNLO below data at high pT
Charge asymmetry results by CMS and LHCb rather well predicted by theory
LHCb high-rapidity cross sections well predicted with NNLO and PDFs
8 TeV Z → μμ angular analysis by CMS, sensitive to Z polarisation and decay structure
Also: LHCb σZ (2.0 < η < 4.5) in agreement with SM (PDFs)
MoriondEW, Mar 19, 2016 Experimental Summary
Diboson productionHighly important sector of LHC physics, intimately related to electroweak symmetry breaking
studied diboson production at 7, 8, 13 TeV. Detailed inclusive, fiducial and differential cross-section analyses at 8 TeV. First 13 TeV results. Theoretical predictions at NNLO needed to match data.
Tiesheng Dai
Each of these measurements in an experimental tour de force
[fb
/GeV
]Z T
pΔ/
fid.
σΔ 1−10
1
Data 2012Powheg
MC@NLOSherpa
ATLAS
-1 = 8 TeV, 20.3 fbs
ν →Z ±W ℓ′ ℓℓ
[fb]
fid.
σΔ
1
10
[GeV]ZT
p0 50 100 150 200 250
Rat
io to
Pow
heg
1
1.5
2
∞
ZZ @ 13 TeV measured by ATLAS & CMS, WZ by CMS: all agree with SM
WW @ 8 TeV cross-sections agree with SM NNLO + pT resummation
WZ @ 8 TeV by ATLAS shows deviations from SM (NLO only)
Zγ @ 8 TeV by ATLAS & CMS, matched by NNLO SM predictions
VBS: evidence in W+W+qq channel, new 8 TeV results on (W/Z)γqq (CMS), and WZqq (ATLAS), no observation yet
Tri-boson process Wγγ& Zγγ observed by CMS, evidence for Wγγ by ATLAS
Large set of anomalous coupling limits
MoriondEW, Mar 19, 2016 Experimental Summary
Top-antitop production at 13 TeVIncrease of cross section by factor of 3.3 over 8 TeV
studied top production in many ways at 13 TeV → very prompt analyses turn around
Pedro Ferreira da Silva
Not
revi
ewed
,for
inte
rnal
circ
ulat
ion
only
[TeV]s2 4 6 8 10 12 14
cro
ss s
ectio
n [p
b]t
Incl
usiv
e t
10
210
310WGtopLHC
ATLAS+CMS Preliminary Mar 2016)-1Tevatron combined 1.96 TeV (L = 8.8 fb)-1 7 TeV (L = 4.6 fbμATLAS e
)-1 7 TeV (L = 5 fbμCMS e)-1 8 TeV (L = 20.3 fbμATLAS e
)-1 8 TeV (L = 19.7 fbμCMS e)-1 8 TeV (L = 5.3-20.3 fbμLHC combined e
)-1 13 TeV (L = 3.2 fbμATLAS e)-1 13 TeV (L = 43 pbμCMS e
)-1 13 TeV (L = 85 pbμμATLAS ee/)-1ATLAS l+jets 13 TeV (L = 85 pb
)-1CMS l+jets 13 TeV (L = 42 pb
WGtopLHC
NNLO+NNLL (pp)
)pNNLO+NNLL (pCzakon, Fiedler, Mitov, PRL 110 (2013) 252004
uncertainties according to PDF4LHCS
α ⊕ = 172.5 GeV, PDF topm
[TeV]s13
600
800
1000
Robust eμ final state gives most precise inclusive results at all CM energies
Differential cross-section measurements at 13 TeV show reasonable modelling, though some deviations at large jet multiplicity
MoriondEW, Mar 19, 2016 Experimental Summary
Single top quark productionIncrease of cross section by factor of 2.5 (t-channel) over 8 TeV
have so far released t-channel measurement at 13 TeV
Pedro Ferreira da Silva
q
q′
W
b
t
]Ve [Ts
Incl
usiv
e cr
oss-
sect
ion
[pb]
1
10
210
7 8 13
WGtopLHCATLAS+CMS PreliminarySingle top-quark productionMarch 2016
t-channel
Wt
s-channel
ATLAS t-channel
ATLAS-CONF-2015-079112006, ATLAS-CONF-2014-007, (2014) PRD90
CMS t-channel
CMS-PAS-TOP-15-004090, (2014) 035, JHEP06 (2012) JHEP12
ATLAS Wt064 (2016) 142, JHEP01 (2012) PLB716
CMS Wt231802 (2014) 022003, PRL112 (2013) PRL110
LHC combination, WtATLAS-CONF-2014-052, CMS-PAS-TOP-14-009
ATLAS s-channel
arXiv:1511.05980L., ATLAS-CONF-2011-118 95% C.
CMS s-channelL. arXiv:1603.02555 95% C.
58 (2014) PLB736NNLO , MSTW2008nnloVeG = 172.5topm
scale uncertainty
091503, (2011) PRD83NNLL + NLO054028 (2010) 054018, PRD81 (2010) PRD82
, MSTW2008nnloVeG = 172.5topm contribution removedtWt: t
uncertaintysα ⊕ PDF ⊕scale
74 (2015) 10, CPC191 (2010) NPPS205NLO ,top= m
Fμ=
Rμ, VeG = 172.5topm
CT10nlo, MSTW2008nlo, NNPDF2.3nlo (PDF4LHC)VeG 60 = removalt veto for tb
TWt: p
VeG 65 =F
μ and
scale uncertainty
uncertaintysα ⊕ PDF ⊕scale
VeG = 172.5top
All exp. results are w.r.t. m
stat syst
“t-channel”
“Wt-channel”
“s-channel”(not easier at 13 TeV)
Tevatron: 6.3σ, ATLAS Run-1: 3.2σ
MoriondEW, Mar 19, 2016 Experimental Summary
Top-antitop production and a vector boson at 13 TeVFirst results on important ttV process, in it’s own right, and as background to ttH and searches
showed new 13 TeV results
Emmanuel Monnier
t
t
g
g Z
q′
q
W
qt
t
Different production processes and thus 13/8 TeV cross-section ratios for ttZ & ttW: 3.6 & 2.4
Analyses combine several multilepton final states, difficult mis-ID background
At 8 TeV, both processes observed, and found to agree with SM prediction (ttW ~1σ up in both ATLAS & CMS)
2j(=0b) 1b)≥2j( 3j(=0b) 3j(=1b) 2b)≥3j( 4j(=0b) 4j(=1b) 2b)≥4j(
Eve
nts
10
20
30
40
50
60
70
80
90
Ztt
WZ
Xtt
rare
data-driven
Data
(13 TeV)-12.7 fbCMSPreliminary
ATLAS: ttW: 1.38 ± 0.70 ± 0.33 pbttZ: 0.92 ± 0.30 ± 0.11 pb
CMS:ttZ: 1.07 pb
SM (NLO): ttW: 0.57 ± 0.06 pbttZ: 0.76 ± 0.08 pb
+0.35–0.31
+0.17–0.14
3L-WZ-CR4L-ZZ-CR
3L-noZ-2b-SSμ2
Dat
a / P
red.
0
0.5
1
1.5
2
Eve
nts
1
10
210
ATLAS Preliminary-1 = 13 TeV, 3.2 fbs
Post-Fit
Data Ztt
Wtt WZZZ tZ
tWZ Htt
Other Fake leptons
Uncertainty
Preliminary ttW/Z results from ATLAS, ttZ from CMS:
MoriondEW, Mar 19, 2016 Experimental Summary
Top property measurementsThis is a huge field of research, studying polarisation, asymmetries, P/CP violation, FCNC
Emmanuel Monnier, Christian Schwanenberger
Tevatron AFB(tt) and NNLO SM prediction have converged towards each other
Charge asymmetries at LHC in agreement with SM
D0 has beautiful new measurement of P and CP-odd observables (CP-odd one found compatible with zero)
Asymmetry (%)20− 0 20 40
0.5−
6.5
D0 note 6445-CONF (2014)
)-1D0 Dileptons (9.7 fb 8.6±18.0
PRD 90, 072011 (2014)
)-1D0 Lepton+jets (9.7 fb 3.0±10.6
CDF Public Note 11161
)-1CDF Combination (9.4 fb 4.5±16.0
CDF Public Note 11161
)-1CDF Dilepton (9.1 fb 13± 12
PRD 87, 092002 (2013)
)-1CDF Lepton+jets (9.4 fb 4.7±16.4
NLO SM, W. Bernreuther and Z.-G. Si, PRD 86, 034026 (2012)
NNLO SM, M. Czakon, P. Fiedler and A. Mitov, arXiv:1411.3007
ttFBTevatron A
En
trie
s
050
100150200250300350400450
-1DØ, 9.7 fbDataNo Spin CorrWith Spin CorrBackground
Discriminant R0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1D
ata
- M
C
-500
50
Eve
nts/
0.1
0
2000
4000
6000
8000
10000
12000
14000
16000ATLAS
-1 = 8 TeV, 20.3 fbs
Data
tSM t
(A=0)tt
Background
, 180 GeV1t~1t
~
Fit
π [rad] / φΔ0 0.2 0.4 0.6 0.8 1
8
Top-antitop spin correlations established at LHC, used by ATLAS to look for “stealth stop”. First 4.2σ evidence for spin correlations by D0.
FCNC processes t → qg, Zq, Hqprobed by ATLAS & CMS, no signal
MoriondEW, Mar 19, 2016 Experimental Summary
Higgs boson Physics
Display of H → eeμμ candidate from 13 TeV pp collisions. The electrons have a transverse momentum of 111 and 16 GeV, the muons 18 and 17 GeV, and the jets 118 and 54 GeV. The invariant mass of the four lepton system is 129 GeV, the di-electron invariant mass is 91 GeV, the di-muon invariant mass is 29 GeV, the pseudorapidity difference between the two jets is 6.4 while the di-jet invariant mass is 2 TeV. This event is consistent with VBF production of a Higgs boson decaying to four leptons.
MoriondEW, Mar 19, 2016 Experimental Summary
In 2015 ATLAS & CMS achieved full Run-1 Higgs combinationAs by product: combined observation of H → ττ decay and VBF production mode
Parameter value0 0.5 1 1.5 2 2.5 3 3.5 4
μ
ttHμ
ZHμ
WHμ
VBFμ
ggFμ
Run 1LHC PreliminaryCMS and ATLAS ATLAS
CMSATLAS+CMS
σ 1±σ 2±
Parameter value0 0.5 1 1.5 2 2.5 3 3.5 4
bbμ
ττμ
WWμ
ZZμ
γγμ
Run 1LHC PreliminaryCMS and ATLAS ATLAS
CMS
ATLAS+CMS
σ 1±
Differential cross-section measurements
Limit on invisible Higgs branching ratio of < 25%
Constraints on anomalous off-shell coupling, spin/CP, LFV, forbidden decays (FCNC) and other scalar particles (BSM Higgs)
Higgs decay processes
combinations of Higgs mass and coupling measurements
Also:
Higgs production processes
13/8 TeV cross section ratios of 2~2.4 for VH, ggH, VBF, but 3.9 for ttH
→ K13/8 ~ 0.8 for ttH3.3/fb
Lidia Dell'Asta
mH = 125.09 ± 0.24 GeV
MoriondEW, Mar 19, 2016 Experimental Summary
One word on lepton flavour violation in Higgs decaysBoth experiments have finalised their Run-1 LFV analyses
While H → μe is severely constrained from flavour physics, H → τμ, τe are not (~10% limits)
CMS released early 2015 a H → τμ search finding a slight (2.4σ) excess
ATLAS has completed full analysis (including H → τe) for this conference
Lidia Dell'Asta, Joachim Kopp
Meant to be examples of flavour violation?
S/(
S+
B)
Wei
ghte
d E
vent
s / 2
0 G
eV
0
10
20
30
40
50
60
Data
Bkgd. uncertainty
SM H
ττ→Z
Other
t, t, tt
μ, e, τMisID'd
LFV Higgs, (B=0.84%)
Data
Bkgd. uncertainty
SM H
ττ→Z
Other
t, t, tt
μ, e, τMisID'd
LFV Higgs, (B=0.84%)
(8 TeV)-119.7 fb
CMS
[GeV]col
)τμM(100 200 300
Bkg
d (f
it)D
ata-
Bkg
d (f
it )
-0.1
0
0.1
H → τμ:
ATLAS: BR = 0.53 ± 0.51% < 1.43% (95% CL)
CMS:BR = 0.84 % < 1.51% (95% CL)
H → τe:
ATLAS: BR = –0.3 ± 0.6% < 1.04%(95% CL)
+0.39–0.37
MoriondEW, Mar 19, 2016 Experimental Summary
Current 13 TeV data sample still marginal for H125But important to look for the signal in an agnostic way at new CM energy
looked for Higgs decays to bosonic and fermionic channels
Seth Zenz
[GeV]4lm
80 90 100 110 120 130 140 150 160 170
Eve
nts/
2.5
GeV
0
2
4
6
8
10
12
14
16Data
= 125 GeV)H
Higgs (mZZ*
tZ+jets, t+V, VVV tt
Uncertainty
4l ZZ* H -113 TeV, 3.2 fb
ATLAS Preliminary
μ = σdata / σSM = 0.82
H →→ ZZ* → 4
+0.57– 0.43σtot,data = 12 pb
σtot,SM = 51 ± 5 pb
+25–16
Expected significance (SM): 2.8σ
Expected significance (SM): 3.4σ
MoriondEW, Mar 19, 2016 Experimental Summary
Current 13 TeV data sample still marginal for H125But important to look for the signal in an agnostic way at new CM energy
looked for Higgs decays to bosonic and fermionic channels
Seth Zenz
μ = 0.69
H → γγ
+0.47– 0.42σtot,data = 40 ± 26 ± 2lumi pb
σtot,SM = 51 ± 5 pb
+16 –10
Expected significance (SM): 1.9σ
Expected significance (SM): 2.7σ
MoriondEW, Mar 19, 2016 Experimental Summary
Current 13 TeV data sample still marginal for H125But important to look for the signal in an agnostic way at new CM energy
looked for Higgs decays to bosonic and fermionic channels
Seth Zenz
Extracted cross sections vs CM energy
[TeV] s7 8 9 10 11 12 13
[pb]
H
→ppσ
10−
0
10
20
30
40
50
60
70
80
90ATLAS Preliminary = 125.09 GeVHm H→ppσ
QCD scale uncertainty
)sα PDF+⊕(scale Tot. uncert. γγ→H l4→*ZZ→H
comb. data syst. unc.
-1 = 7 TeV, 4.5 fbs-1 = 8 TeV, 20.3 fbs
-1 = 13 TeV, 3.2 fbs
H → 4 , fiducial cross sectionCombined H → 4 , γγ
MoriondEW, Mar 19, 2016 Experimental Summary
First search for ttH production at 13 TeV by CMSMost interesting of the SM channels at current luminosity
showed preliminary results for ttH in all major Higgs decay channels: H → γγ, multi-leptons, bb
Highly complex analyses, huge effort to get these done so quickly after data taking
Johannes Hauk g
g
t
H
t
H →→ γγ,tt → 0 & 1 leptons
μ = 3.8 +4.5– 3.6
ttH → multi-leptons2 same charge / 3 leptons
μ = 0.6 +1.4– 1.1
e±μ±
H → bbtt → 1 & 2 leptons
μ = –2.0 ±1.8 < 2.6 (95% CL)
= 125 GeVH at mSM
σ/σ = μBest fit
10− 5− 0 5
Combined
Dilepton
Lepton+Jets
CMS Preliminary (13 TeV)-12.7 fb
MoriondEW, Mar 19, 2016 Experimental Summary
Searches — a fresh start*
*A few anomalies from Run-1 are to be followed up in Run-2
LHC-13
MoriondEW, Mar 19, 2016 Experimental Summary
[GeV]Tm
Eve
nts
/ 10
GeV
110
1
10
210
310
410
510Diboson & single-toptt
Z+jets MisID j
MisID e/ 5) 200 GeV ( +H
W+jets 10) 1000 GeV ( +H
Data
ATLAS Preliminary-1 = 13 TeV, 3.2 fbs
[GeV]Tm210 310
Dat
a / S
M
00.5
11.5
2Uncertainty
Eve
nts
/ G
eV
3−10
2−10
1−10
1
10
210 Dataττ →H/A
= 25β = 500 GeV, tanAmMulitjet
ττ→Zντ→W
, single topttOthersUncertaintyPre-fit background
ATLAS Preliminary -1 = 13 TeV, 3.2 fbs
hadτhadτ →H/A
[GeV]totTm
200 300 400 500 600 700 800 900 1000Dat
a/P
red
012
BSM Higgs boson searchesSingle BEH doublet and form of potential simple but Nature may be more complex
(only results recalled here, more shown by Allison) mainly heavy BSM searches interesting
H+ → τ : sensitivity better than Run-1 at mass > 250 GeV
H / A → ττ: similarly, improved sensitivity at mass > 700 GeV
A → Z(→ , ) h125(→ bb): improved sensitivity > 800 GeV
H → ZZ(→ qq, qq, 4 ) / WW (→ qq): searches addressed 1–3 TeV mass range with boosted bosons
X → hh → bbγγ: small excess in Run-1 at mX~300 GeV, not yet excluded at 13 TeV
X → hh → bbττ resonant (and non-resonant) search
H+ → τ H / A → ττ
A → Zh
Allison McCarn
None of these many searches showed anomaly so far [GeV]kinfit
Hm300 400 500 600 700 800 900 1000
[1/G
eV]
kinf
itH
dN/d
m
4−10
3−10
2−10
1−10
1
10
210 CMSpreliminary
(13 TeV)-12.7 fb
Datatt
QCDDrell-YanOther bkg.bkg. uncertainty
= 800 GeVHm = 450 GeVHm = 300 GeVHm
hh) = 10 pb→ BR (H× H) →(ppσ
hτhτbb
channel
X → hh → bbττE
vent
s / 1
00 G
eV
1−10
1
10
210
310
410
510Data
=113 fb)σ Zh (→A=600 GeVAm
DibosonVhtt
Single topW+(bb,bc,cc,bl)W+clZ+(bl,cl)Z+(bb,bc,cc)Z+lUncertaintyPre-fit background
ATLAS Preliminary -1Ldt = 3.2 fb∫ = 13 TeV s
2 jets, 2 tags≥0 lep.,
< 500 GeVVT
p≤150 GeV
< 140 GeVbb
m≤110 GeV
(Vh) [GeV]Tm200 300 400 500 600 700 800 900 1000D
ata/
Pre
d.
0.5
1
1.5
MoriondEW, Mar 19, 2016 Experimental Summary
Searches in high-pT multijet final states at 13 TeVProcesses with large cross-sections, sensitivity to highest new physics scales
Clemens Lange
Dijet resonance and angular distribution
High-pT multijets produced, eg, by strong gravity
High-pT lepton + jets (strong gravity)
Second generation scalar lepto-quark pair production (μq-μq final state, excl. < 1.2 TeV)
None of these searches showed an anomaly so far
Eve
nts
1
10
210
310
410
510
|y*| < 0.6Fit Range: 1.1 - 7.1 TeV
-value = 0.67pQBH (BM)
3× σ*, q
data
- fi
tS
igni
fican
ce
2−
0
2
[TeV]jjm2 3 4 5 6 7
MC
Dat
a-M
C
1−
0
1JES Uncertainty
ATLAS-1=13 TeV, 3.6 fbs
DataBackground fitBumpHunter interval
= 4.0 TeV*q
*, mq = 6.5 TeV
thQBH (BM), m
1
10
|y*| <Fit Ra
-valupQBH
σ*, q
data
- fi
tS
igni
fican
ce
2−
0
2
2
MC
Dat
a-M
C
1−
0
1JES Uncertainty
[GeV]TS3000 4000 5000 6000 7000
Eve
nts
/ 0.1
TeV
-410
-310
-210
-110
1
10
210
310
410
510 CMS Preliminary
(13 TeV)-12.2 fb
8≥Data with multiplicity
Bkg prediction from data
= 5 TeV, n=6BH
= 4 TeV, MDM
= 6 TeV, n=6BH
= 4 TeV, MDM
= 7 TeV, n=6BH
= 4 TeV, MDM
= 8 TeV, n=6BH
= 4 TeV, MDM
[GeV]TS2500 3000 3500 4000 4500 5000 5500 6000 6500 7000
(Dat
a -
Fit)
/Fit
-2-1.5
-1-0.5
00.5
11.5
2
MoriondEW, Mar 19, 2016 Experimental Summary
Searches in high-pT multijet final states at 13 TeVProcesses with large cross-sections, sensitivity to highest new physics scales
Pieter Everaerts
None of these searches showed an anomaly so far
Eve
nts
1
10
210
310
[TeV]jjm
Sig
nific
ance
2−1−012
1 2 3 4
ATLAS Preliminary -1=13 TeV, 3.2 fbsData
Background fitBumpHunter intervalSSM Z', 1.25 TeVLeptophobic Z', 1.5 TeV
2 b-tag
50× σSSM Z',
50× σLeptophobic Z',
p-value = 0.71
Eve
nts
20
40
60
80 Datatt
Other SM=1 pb)σZ' 3 TeV (
+jets, 1 t tagμe/ (13 TeV)-12.6 fb
PreliminaryCMS
[GeV]tt
M0 1000 2000 3000 4000
Dat
a/B
kg
0.51
1.5
Top-tagged data sample
MoriondEW, Mar 19, 2016 Experimental Summary
Searches in leptonic final states (I)Canonical searches for new physics in high-mass Drell-Yan production (Z’, W’)
have analysed their full 2015 dataset and presented results for + – and final states
Eve
nts
210
110
1
10
210
310
410
510
610 Data*Z/
Top QuarksDibosonMulti-Jet & W+Jets
(3 TeV)Z’ = 20 TeV
-LL
PreliminaryATLAS-1 = 13 TeV, 3.2 fbs
Dilepton Search Selection
Dielectron Invariant Mass [GeV]90100 200 300 400 1000 2000 3000
Dat
a / B
kg
0.60.8
11.21.4
100
Good high-mass Drell-Yan modelling crucial → SM diff. cross-section measurements paired with searches
High-pT muon reconstruction challenges detector alignment
No anomaly found. SSM Z’ / W’ benchmark limits set at 3.4 / 4.4 TeV (2.9 / 3.3 TeV at 8 TeV)
ATLAS also looked into high-mass eμ (LFV) production. Main background top-antitop. No anomaly seen
m(ee) [GeV]70 100 200 300 1000 2000
Eve
nts
/ GeV
6−10
5−10
4−10
3−10
2−10
1−10
1
10
210
310
410
510Data
-e+e→/Zγ
ττ, tW, WW, WZ, ZZ, tt
Jets = 2 TeV)
Z'Narrow Z' (M
(13 TeV)-12.6 fb
CMSPreliminary
Ent
ries
110
1
10
210
310
410
510
610 -1 = 13 TeV, 3.3 fbs
DataWTop
*Z/DibosonMultijet
W’ (2 TeV)
W’ (3 TeV)
W’ (4 TeV)
PreliminaryATLAS
selection W’
Transverse mass [GeV]200 300 1000 2000
Dat
a / B
kg
0.60.8
11.21.4
Eve
nts
1−10
1
10
210
310
410
510
610 Data
νμ →W
tt
*γZ/
Diboson
SSM W' 2.4 TeV
SSM W' 3.6 TeV
CMSPreliminary
miss
T+Eμ
(13 TeV)-12.2 fb
(GeV)TM210×2 210×3 310 310×2 310×3
Dat
a/M
C
0
0.5
1
1.5
2
Systematic uncertainty band
James Catmore
MoriondEW, Mar 19, 2016 Experimental Summary
M = 2.9 TeV !!!Display of rare colossal e+e– candidate event with 2.9 TeV invariant massEach electron candidate has 1.3 TeV ET
Back-to-back in φHighest-mass Run-1 events: 1.8 TeV (ee), 1.9 TeV (μμ)
MoriondEW, Mar 19, 2016 Experimental Summary
Searches for diboson resonances (hh, Vh, VV)
High pT of bosons boosts hadronic decay products giving merged jets
as in the other searches: 10 Run-2 analyses presented. Hadronic decay modes use jet substructure analysis to reconstruct bosons. Important strong interaction backgrounds
Max Bellomo, Maurizio Pierini
Eve
nts/
100
GeV
-110
1
10
210
310ATLAS Preliminary
-1 = 13 TeV, 3.2 fbs
WZ selection
Data 2015
Fit bkg estimation
Fit exp. stats error
[GeV]JJm1000 1200 1400 1600 1800 2000 2200 2400
Pul
l
-202
Some excess of events around 2 TeV (globally 2.5σ for ATLAS) seen in WZ mode at 8 TeV in fully hadronic channel, not seen in the other decay channels
So far no excess in 13 TeV data around 2 TeV, also other diboson searches do not show anomaly
Eve
nts
/ 94.
7 G
eV
-110
1
10
210
310
410CMS data
2 par. background fit
= 0.029 pb)σWZ (→W'(2 TeV)
WZ, high-purity
> 200 GeVT
| < 2.4, pη|
| < 1.3jjηΔ > 1 TeV, |jjM
(13 TeV)-12.6 fb
CMSPreliminary
Dijet invariant mass [GeV]1000 1500 2000 2500 3000 3500
σD
ata-
Fit
-3-2-10123
MoriondEW, Mar 19, 2016 Experimental Summary
Supersymmetry (I)With jets & MET
have updated their most sensitive SUSY searches using (b-)jets and MET
g
g
t
t
p
p
t
χ01
t
t
χ01
t
q
qp
p
χ01
q
χ01
q
g
gp
p
χ01
q
q
χ01
q
q
Benefit from improved background modelling (better generators & theory, better tuning), but can still find large scale factors from control region normalisation of SM processes in extreme corners of phase spacePersonal remark: need to make sure our analyses are optimised for discovery (not limits)
Eve
nts
/ 200
GeV
1
10
210
310
410
510ATLAS Preliminary
-1 = 13 TeV, 3.3 fbsGtt 1-lepton pre-selection
Data 2015Total backgroundttSingle top + W/Z/htt
Z+jetsW+jetsDiboson
100)× σ = 1600, 200 (0
1χ∼
, mg~
Gtt: m
100)× σ = 1400, 800 (0
1χ∼
, mg~
Gtt: m
[GeV]incleffm
500 1000 1500 2000 2500 3000
Dat
a / S
M
0
1
2
[GeV]g~m1000 1200 1400 1600 1800 2000
[GeV
]10χ∼
m
0
200
400
600
800
1000
1200
1400
1600-1ATLAS 8 TeV, 20.1 fb
)expσ1 ±Expected limit (
)theorySUSYσ1 ±Observed limit (
t
+ 2m0
1χ∼ < mg~m
)g~) >> m(q~, m(0
1χ∼+t t→ g~ production, g~g~
All limits at 95% CL
PreliminaryATLAS-1=13 TeV, 3.3 fbs
-1ATLAS 8 TeV, 20.1 fb
)expσ1 ±Expected limit (
)theorySUSYσ1 ±Observed limit (
600
10000
200
4000000000000000000000000000000000000000000000
No significant anomaly seen in 7 different jets + MET analyses presented
Chris Young
MoriondEW, Mar 19, 2016 Experimental Summary
Supersymmetry (II)With leptons, jets & MET
target production of W/Z + jets + MET, as well as top through gluino decay (via stop)
g
g
t
t
p
p
t
χ01
t
t
χ01
t
Lower backgrounds than in jets + MET studies, but also lower signal
Henning Kirschenmann
9 searches presented, including two looking for same-charge lepton pairs and 3 leptons. No anomalies (apart from Z+MET)
g
g
χ02
χ±1
p
p
q q
χ01
Z/h
χ01
W
Small excess (2.2σ) observed, 3σ excess was seen by ATLAS in that channel at 8 TeV
Excess was not confirmed by CMS/8 TeV, neither at 13 TeV
A small CMS/8 TeV excess (2.6σ) off-Z was not confirmed
[GeV]llm50 100 150 200 250 300 350 400
Eve
nts
/ 20
GeV
0
5
10
15
20
25
30
35 Data 2015
Standard Model (SM)
+jets)* (from Z/
Flavour symmetric
Rare top
WZ/ZZ
-1 = 13 TeV, 3.2 fbs
ee+
ATLAS Preliminary
[GeV]g~m
600 800 1000 1200 1400 1600
[GeV
]0 1χ∼
m
0
200
400
600
800
1000
1200
-310
-210
-110
1
(13 TeV)-12.3 fbCMS Preliminary
NLO+NLL exclusion1
0χ∼ ±' Wq q → g~, g~ g~ →pp
theoryσ 1 ±Observed
experimentσ 1 ±Expected
)0
1χ∼
+mg~
= 0.5(m±
1χ∼m
95%
C.L
. upp
er li
mit
on c
ross
sec
tion
[pb]
SUS-15-006 Δɸ (0b)
Opposite sign dilepton search (here on-Z)
MoriondEW, Mar 19, 2016 Experimental Summary
Third generation quark partnersSearches for direct production
may be the lightest sfermions. They have low cross-sections, so run-2 luminosity just enough to increase sensitivity
Vector-like quarks* (VLQ) singly or pair produced decay to bW, tZ or tH. Also exotic X5/3 → tW possible
Signatures are b-jets, jets, possibly leptons and MET
Pieter Everaerts
t
t
tW
tW
p
p
χ01
b �
ν
χ01
b
q
q
b
bp
p
χ01
b
χ01
b
*Hypothetical fermions that transform as triplets under colour and who have left- and right-handed components with same colour and EW quantum numbers
[GeV]1b
~m100 200 300 400 500 600 700 800 900 1000 1100
[GeV
]0 1χ∼
m
0
100
200
300
400
500
600
700
800
Best SR
forb
idde
n
01χ∼
b
→ 1b~
=8 TeVs, -1 + 2 b-jets, 20.1 fbTmissATLAS E
=8 TeVs, -1ATLAS monojet, 20.3 fb
0
1χ∼ b → 1b
~Bottom squark pair production,
-1=13 TeV, 3.2 fbs
ATLAS Preliminary)
theorySUSYσ1 ±Observed limit (
)expσ1 ±Expected limit (
All limits at 95% CL
Total of 10 Run-2 analyses
No anomaly seen
Sensitivity improved over Run-1
Similar for VLQ searches
MoriondEW, Mar 19, 2016 Experimental Summary
Mass [GeV]
0 500 1000 1500 2000 2500 3000
Ent
ries
/ 50
GeV
3−10
2−10
1−10
1
10
data
background) = 1200 GeVg~m() = 1600 GeVg~m(
ATLAS Preliminary-1 = 13 TeV, 3.2 fbs
stable selection
Searches in unconventional final statesATLAS & CMS also started to look for long-lived massive particle at 13 TeV
(due to: large virtuality, low coupling, mass degeneracy, eg, scale-suppressed colour triplet sclar from unnaturalness by Tony Gherghetta).
Multitude of signatures, some requiring dedicated triggers, most requiring dedicated analysis strategies.
Revital Kopeliansky
Mass from dE/dx measured in Pixel only (sensitivity to metastable particles)
Mass (GeV)0 1000 2000
Tra
cks
/ bin
2−10
1−10
1
10
210
Observed
Data-based SM prediction
Stau (M = 494 GeV)
(13 TeV)-12.4 fb
CMSPreliminary
Tracker + TOF
ATLAS and CMS have so far looked into heavy long-lived SUSY particles at 13 TeV
Analysis uses tracker dE/dx and TOF from muon system
[ns]τ
2−10 1−10 1 10 210 310 410
[GeV
]g~
Low
er li
mit
on m
600
800
1000
1200
1400
1600
1800
2000
2200
2400 ExpectedObserved
Phys. Rev. D92, 072004Displaced vertices Phys. Rev. D88, 112003Stopped gluino JHEP 01 (2015) 068Stable charged
ATLAS-CONF-2015-062 missTJets+E
To appearPixel dE/dx
not includedtheorySUSYσ95% CL limits.
=8 TeVs, -118.4-20.3 fb
=13 TeVs, -13.2 fb
PreliminaryATLAS
Status: March 2016 = 100 GeV1
0χ∼ ; m
1
0χ∼ g/qq → R-hadron g~
}}
=1)γβ=0, η(r for Beampipe Inner Detector Calo MS
Pro
mpt
Sta
ble
[m]τc
3−10 2−10 1−10 1 10 210 310 410
MoriondEW, Mar 19, 2016 Experimental Summary
Searches for dark matter production at the LHCCanonical signature is ‘X+MET’ with large variety of ‘X’
Requires boost for triggering. Depending on coupling it can be made by different objects.
Matteo Cremonesi
DM
DM
SM
SM
DirectDetection
(DM collision nuclear recoils)
Indirect detection
Production at colliders
Energetic gluon/photon radiation in the initial sate
Eve
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/ 50
GeV
210
110
1
10
210
310
410
510
610
710ATLAS Preliminary
-1 = 13 TeV, 3.2 fbsSignal Region
>250 GeV miss
T>250 GeV, E
Tp
Data 2015
Standard Model) + jets Z(
) + jets W(
) + jets W(
) + jets eW(
ll) + jetsZ(
Dibosons
+ single toptt
) = (350, 345) GeV0
, b~
m()= (150, 1000) GeV
med, M
DM(m
=5600 GeVD
ADD, n=3, M
[GeV]T
Leading jet p400 600 800 1000 1200 1400
Dat
a / S
M
0.5
1
1.5
Eve
nts
0.3
1
23
10
2030
100
200300
Data) + jetsννZ() + jetsνW(l
ttsingle tVV, VHmultijetBkg. unc.
=100 GeVΦm=1000 GeVΦm
(13 TeV)-12.17 fb
CMSPreliminary 2 b-tag category
=1 GeVχ
DM+bb/tt, m
scalar mediator
DM + heavy flavour
(GeV)TE
200 300 400 500 600 700 800 900 1000Dat
a / B
kg
00.5
11.5
2 0.065±Data/Bkg = 1.030 /ndf = 1.03, K-S = 1.0002χ
pre-fit post-fit
Experimentally challenging to control Z/W+jetsbackground. Theory input needed.
Several 13 TeV results already available:
jets + MET
γ + MET
V + MET
bb/tt + MET
No anomaly seen so far
MoriondEW, Mar 19, 2016 Experimental Summary
The return of the limits …
[GeV]
g~m
1000
1200
1400
1600
1800
2000
[GeV
]
1
0 χ∼m
0
200
400
600
800
1000
1200
1400
1600
-1
ATLAS 8 TeV, 20.1 fb
)expσ1 ±
Expected limit ( )
theorySUSY
σ1 ±
Observed limit (
t
+ 2
m0
1χ∼
< m
g~m
)g~
) >> m(
q~, m
(0
1χ∼
+t t→ g~
production,
g~g~
All limits at 95% CL
Preliminary
ATLAS -1
=13 TeV, 3.3 fb
s
-1
ATLAS 8 TeV, 20.1 fb
)expσ1 ±
Expected limit ( )
theorySUSY
σ1 ±
Observed limit ()g~ )
) >> m(
q~ ), m
(0
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MoriondEW, Mar 19, 2016 Experimental Summary
Light quanta
Used since forever as detection probe
Recent example: H → yyFirst medical X-ray by Wilhelm Röntgen of his wife Anna Bertha
Ludwig's hand, Nov 1895[First Nobel price of physics, 1901]
MoriondEW, Mar 19, 2016 Experimental Summary
Diphoton resonance searches: ATLASUpdated preliminary results presented this week
showed dedicated searches for a spin-0 and a spin-2 diphoton resonance.
Main difference is acceptance: spin-0: ET(γ1) > 0.4 mγγ, ET(γ2) > 0.3 mγγ, spin-2: ET(γ1/2) > 55 GeV
Photons are tightly identified and isolated. Typical purity ~94%
Background modelling empirical in spin-0, and (mainly) theoretical in spin-2 case (for high-mass search)
Marco Delmastro
Eve
nts
/ 20
GeV
1−10
1
10
210
310
410ATLAS Preliminary
Spin-0 Selection-1 = 13 TeV, 3.2 fbs
Data
Background-only fit
[GeV]γγm200 400 600 800 1000 1200 1400 1600
Dat
a -
fitte
d ba
ckgr
ound
10−
5−
0
5
10
15
Eve
nts
/ 20
GeV
1−10
1
10
210
310
410 PreliminaryATLAS
Spin-2 Selection-1 = 13 TeV, 3.2 fbs
Data
Background-only fit
[GeV]γγm200 400 600 800 1000 1200 1400 1600 1800 2000
Dat
a -
fitte
d ba
ckgr
ound
10−
5−
0
5
10
15
2878 events (mγγ > 200 GeV) 5066 events (mγγ > 200 GeV)
Spin-0 analysis Spin-2 analysis
MoriondEW, Mar 19, 2016 Experimental Summary
Diphoton resonance searches: ATLASUpdated preliminary results presented this week
Event properties in signal region appear similar to those in sidebands, within large statistical uncertainties
Marco Delmastro
] L
ocal
sig
nific
ance
[0
0.5
1
1.5
2
2.5
3
3.5
4
[GeV]X m
200 400 600 800 1000 1200 1400 1600
[%]
X/m
X
0
2
4
6
8
10
ATLAS Preliminary -1 = 13 TeV, 3.2 fbs Spin-0 Selection
X [GeV]G*m
600 800 1000 1200 1400 1600 1800 2000
Pl
M/k
0.05
0.1
0.15
0.2
0.25
0.3 ]Lo
cal s
igni
fican
ce [
0
0.5
1
1.5
2
2.5
3
3.5
Spin-2 Selection-1 = 13 TeV, 3.2 fbs PreliminaryATLASSpin-0 analysis Spin-2 analysis
Background-only p-value scan versus resonance mass and width:
Lowest p-value at ~750 GeV, Γ ~ 45 GeV (6%)
Local / global Z = 3.9 / 2.0σ
Lowest p-value at ~750 GeV, Γ ~ 7% of mass
Local / global Z = 3.6 / 1.8σ
Global p-values derived with respect to scan planes
MoriondEW, Mar 19, 2016 Experimental Summary
Diphoton resonance searches: ATLASUpdated preliminary results presented this week
Compatibility with 8 TeV result (slight reanalysis: latest e/γ calibration, 13 TeV analysis method)
Marco Delmastro
P-value at 750 GeV, Γ ~ 6% of mass: 1.9σ
Compatibility: gg = 4.7 / qq = 2.7 scaling: 1.2σ / 2.1σ
Global p-values derived with respect to scan planes
Eve
nts
/ 20
GeV
1−10
1
10
210
310
410ATLAS Preliminary
Spin-0 Selection-1 = 8 TeV, 20.3 fbs
Data
Background-only fit
[GeV]γγm200 400 600 800 1000 1200 1400 1600 1800
Dat
a -
fitte
d ba
ckgr
ound
10−
5−
0
5
10
15
• 1 9 σ at m = 750 GeV Γ /m = 6% No significant excessE
vent
s / 2
0 G
eV
1−10
1
10
210
310
410 PreliminaryATLAS
Spin-2 Selection-1 = 8 TeV, 20.3 fbs
Data
Background-only fit
[GeV]γγm200 400 600 800 1000 1200 1400 1600 1800 2000
Dat
a -
fitte
d ba
ckgr
ound
15−10−
5−05
101520
No excess at 750 GeV
Compatibility: gg / qq scaling: 2.7σ / 3.3σ
Spin-0 analysis Spin-2 analysis
MoriondEW, Mar 19, 2016 Experimental Summary
Diphoton resonance searches: ATLASDigression: ATLAS also presented 13 TeV Zγ searches this week
Narrow resonance search, split into Z → and Z → qq final states (qq dominant at high mass).
Background from empirical function
Allison McCarn
Eve
nts
/ 20
GeV
2−10
1−10
1
10
210
310ATLAS Preliminary
-1=13 TeV, 3.2 fbs
DatabBackground-only fit,
[GeV]γJm1000 1500 2000 2500 3000
Dat
a -
b20−10−
01020
Eve
nts
/ 20
GeV
2−10
1−10
1
10
210
310
DatabBackground-only fit,
ATLAS Preliminary
-1=13 TeV, 3.2 fbs
[GeV]γllm200 400 600 800 1000 1200 1400 1600
Dat
a -
b
20−10−
01020
No excess in spectra, limits following expectation
γZ (→ ) γZ (→ qq)
MoriondEW, Mar 19, 2016 Experimental Summary
Diphoton resonance searches: CMSUpdated preliminary results presented this week
searches agnostically for spin 0 and 2 bosons. Updated 13 TeV analysis with improved ECAL calibration (~30% improved resolution above mγγ ~ 500 GeV), and including 0.6 fb–1 of B-field off data
Acceptance: ET(γ1/2) > 75 GeV, at least one γ with | | < 1.44 (barrel), split EB-EB, EB-EE
Dedicated calibration of B-field-off data, slightly lower γ-ID efficiency, better resolution, harder PV finding
Empirical background modelling
Pasquale Musella
Eve
nts
/ ( 2
0 G
eV )
1
10
210
Data
Fit model
σ 1 ±
σ 2 ±
EBEB
(GeV)γ γm400 600 800 1000 1200 1400 1600
stat
σ(d
ata-
fit)/
-2
0
2
(13 TeV, 3.8T)-12.7 fbCMS Preliminary
Eve
nts
/ ( 2
0 G
eV )
1
10
210 Data
Fit model
σ 1 ±
σ 2 ±
EBEB
(GeV)γ γm400 600 800 1000 1200 1400 1600
stat
σ(d
ata-
fit)/
-2
0
2
(13 TeV, 0T)-10.6 fbCMS Preliminary
Eve
nts
/ ( 2
0 G
eV )
1
10
210 Data
Fit model
σ 1 ±
σ 2 ±
EBEE
(GeV)γ γm400 600 800 1000 1200 1400 1600
stat
σ(d
ata-
fit)/
-2
0
2
(13 TeV, 3.8T)-12.7 fbCMS Preliminary
Eve
nts
/ ( 2
0 G
eV )
1
10Data
Fit model
σ 1 ±
σ 2 ±
EBEE
(GeV)γ γm400 600 800 1000 1200 1400 1600
stat
σ(d
ata-
fit)/
-2
0
2
(13 TeV, 0T)-10.6 fbCMS Preliminary
MoriondEW, Mar 19, 2016 Experimental Summary
Diphoton resonance searches: CMSUpdated preliminary results presented this week
CMS has also looked into event properties of excess region and found them consistent with sidebands
CMS combines 13 TeV with spin-0 and 2 searches from 8 TeV data. Results found to be compatible.
Resulting p-value scans (lowest width models, giving largest excess at 750 GeV, shown here):
Lowest p-value at ~750 GeV (760 for 13 TeV data only), narrow width
Local / global Z = 3.4σ / 1.6σ (2.9σ / < 1 for 13 TeV data only)
(GeV)Sm210×5 310 310×2 310×3
0p-410
-310
-210
-110
J=0-4 10× = 1.4 mΓ
Combined
8TeV
13TeV
σ1
σ2
σ3
(8 TeV)-1 (13 TeV) + 19.7 fb-13.3 fbCMS Preliminary
(GeV)Gm210×5 310 310×2 310×3
0p
-410
-310
-210
-110
J=2-4 10× = 1.4 mΓ
Combined
8TeV
13TeV
σ1
σ2
σ3
(8 TeV)-1 (13 TeV) + 19.7 fb-13.3 fbCMS Preliminary
Pasquale Musella
MoriondEW, Mar 19, 2016 Experimental Summary
Alessandro Strumia:
Today it could be everything, including nothing.
MoriondEW, Mar 19, 2016 Experimental Summary
Alessandro Strumia:
Today it could be everything, including nothing.
Soon we shall know more.
MoriondEW, Mar 19, 2016 Experimental Summary
Moriond EW (51st edition) has been memorable
It exhibited once again the challenges today’s experimental physics takes on and overcomes
The discovery of the Higgs boson required the construction of a huge accelerator and ultra-sophisticated particle detectors to find the events buried under 1012 times larger backgrounds
The direct observation of gravitational waves required to measure over 4 km a relative length deformation two hundred times smaller than the size of a proton.
Similar things can be said about neutrino physics, dark matter searches, etc. It is breathtaking.
Accomplishing these measurements requires great ideas, visionary leadership, long-term support by governments & society, innovative & highest quality hardware and software, computing resources, operational & maintenance support, precise & unbiased analysis — and above all: dedication
Given what we have seen this week, I have no worry. We live in an extraordinary period for fundamental experimental research in physics
MoriondEW, Mar 19, 2016 Experimental Summary
Congratulations to the 50th anniversary of Moriond EW & UT.
There will be ample material for an exciting next half a century !
MoriondEW, Mar 19, 2016 Experimental Summary
Spare slides
MoriondEW, Mar 19, 2016 Experimental Summary
Very short-baseline (reactor) neutrino experiments : SoLidPut neutrino experiment closer to the source to test anti-neutrino flux models
highly segmented plastic scintillation detector coated with Lithium-6, designed to measure flux and energy of anti- e at very short baseline distances between 6–10 m from the compact BR2 test reactor with highly-enriched uranium core in Mol (Belgium).
Challenge is background suppression in proximity of reactor (high captured neutron–e/γ separation) and precise location of IBD products: not only time difference, but also spatial information used to reconstruct IBD events
3 ton SoLid experiment deployed 5.5 m from the BR2 reactor core
Long-term goal: run experiment for three years to resolve reactor neutrino anomaly w/o relying on theoretical calculations. Results with 290 kg prototype presented.
time (16 ns)0 50 100 150 200 250
am
plit
ude (
AD
C c
ount)
-50
0
50
100
150
200
250
300
350
400horizontal fibre
vertical fibre
SoLid preliminary
Example neutron waveform
time (16 ns)0 50 100 150 200 250
am
plit
ude (
AD
C c
ount)
0
100
200
300
400
500
600
700
800horizontal fibre
vertical fibre
SoLid preliminary
Example EM waveform
Nick van Remortel
MoriondEW, Mar 19, 2016 Experimental Summary
Of which quantum nature are neutrinos ?EXO-200 showed new limits on neutrinoless double beta decay (0 ββ) in 136Xe → 136Ba + 2e–
enriched (~81%) liquid-xenon TPC (shielded + active muon veto) is installed in nuclear waste isolation plant in New Mexico, US.
Experiments require: • large mass • high isotopic abundance • good energy resolution • high efficiency • low background
2 ββ 0 ββ (LFV)
Requires non-zero Majorana mass term
Γ0 ββ |m |2
mmin [eV]
|mββ
| [
eV]
NS
IS
Cosm
ological Limit
Current Bound
10−4 10−3 10−2 10−1 110−4
10−3
10−2
10−1
1
1σ2σ3σ
100 kg·yr 136Xe exposure:
Lower limit on mMaj( ) = 0.2–0.4 eV (90% CL)
Dominant uncertainty from nuclear matrix element
Lightest mass [eV]
Effe
ctiv
e m
ass,
|m|
[eV
]
m3 lightest
m3 heaviest
oscillation constraints
Yung-Ruey Yen
MoriondEW, Mar 19, 2016 Experimental Summary
Of which quantum nature are neutrinos ?CUORE (“heart”) at LNGS is one of several next generation 0 ββ experiments
bolometric technique using array of tellurium dioxide crystals (130Te → 130Xe + 2e–) cooled to ~10 mK → low heat capacity: single particle interaction produces measurable rise in temperature
CUORE-0 (2013–2015): 11 kg 130Te || CUORE (2016–…): 206 kg 130TeSensitivity (detector mass)1/2
Lower limit on mMaj( ) = 0.3–0.8 eV (90% CL)
Reconstructed Energy (keV)2470 2480 2490 2500 2510 2520 2530 2540 2550 2560 2570
Eve
nts
/ (2
keV
)
0
2
4
6
8
10
12
14
16
18/NDF = 43.9/462χ y
r))
⋅ k
g ⋅
Eve
nt R
ate
(cou
nts
/(ke
V
0
0.05
0.1
0.15
0.2
0.25
)σ(R
esid
ual
4−2−024
9.8 kg·yr 130Te exposure (CUORE-0):
Qßß value (2528 keV)
(eV)lightestm4−10 3−10 2−10 1−10
(eV
)ββ
m
4−10
3−10
2−10
1−10
1
(c) 76Ge(a) 130Te (This work)(b) 136Xe
CUORE 90% C.L. sensitivity
IH
NH
CUORE-0 + Cuoricino: T1/20 ββ > 4.0 1024 yr
Paolo Gorla
MoriondEW, Mar 19, 2016 Experimental Summary
Cosmological neutrinos: Baryonic Acoustic OscillationsNeutrino physics in the Lyman- forest (2 < z < 5) using BOSS data
offers laboratory with sensitivity to the neutrino mass: free-streaming primordial neutrinos leave their imprint into large-scale structure (LSS) observables:
Set expansion rate at BBN
Suppression of power on small scales probed, eg, by Lyman- forest BAO data
Slow down growth of structure
Reproduce numerically using hydrodynamical models large-structure formation using different neutrino masses.
Combine results on Lyman- forest with CMB (Planck, WMAP, ACT, SPT)
)-1k (h Mpc-410 -310 -210 -110 1
(m
assl
ess)
k (
mas
sive
) / P
kP
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
Level from CMB
Lyman-alpha
= 0.5 eV, z=4ν mΣ
= 0.5 eV, z=2ν mΣ
= 0.5 eV, z=0ν mΣ
= 1.0 eV, z=4ν mΣ
= 1.0 eV, z=2ν mΣ
= 1.0 eV, z=0ν mΣ
Pivot scale
mΩ0.26 0.28 0.3 0.32 0.34 0.36 0.38 0.4 0.42 0.44
ν m
Σ0
0.2
0.4
0.6
0.8
1
1.2 Planck (TT+lowP)
0 + Hα Ly-
+ Planck (TT+lowP) α Ly-
Σm < 1.1 eV (Ly- alone)
< 0.23 eV (CMB, Planck)
< 0.12 eV (Ly- & CMB & BAO combined)
Graziano Rossi
Large list of possible systematic uncertainties
MoriondEW, Mar 19, 2016 Experimental Summary
Life in 2015: 13 TeV / 8 TeV inclusive pp cross-section ratio
1 10 100 1000 10000
QBH (6 TeV) QBH (5 TeV)
Q* (4 Tev) Z' SSM (3 TeV)
gluino pair (1.5 TeV) stop pair (0.7 TeV)
A(0.5 TeV, ggF+bbA) ttH ttZ tt
H (VBF) H (ggF)
WH t (t-channel) t (s-channel)
ZZ Z(ll)
W(ln) Minimum bias
9000 370
56 10
46 8.4
4.0 3.9
3.6 3.3
2.4 2.3
2.0 2.5
2.2 2.0
1.7 1.6
1.2 Larger cross section increase for gluon induced than for quark induced processes.
Early Run-2 puts emphasis on searches
MoriondEW, Mar 19, 2016 Experimental Summary
New CP violation results in b-hadrons from LHCbApart from the results shown below, new measurements in Lb sector
contributes to vanilla CKM CP physics through various Bd meson measurements
For example: world’s best Δmd from LHCb: 0.5050 ± 0.0021± 0.0010 ps–1 (B-factories: σave = 0.005 ps–1)
Sean Benson
-2 -1 0 1 2 3
BaBarPRD 79 (2009) 072009
0.69 0.03 0.01
BaBar c0 KSPRD 80 (2009) 112001
0.69 0.52 0.04 0.07
BaBar J/ (hadronic) KSPRD 69 (2004) 052001
1.56 0.42 0.21
BellePRL 108 (2012) 171802
0.67 0.02 0.01
ALEPHPLB 492, 259 (2000)
0.84 +-01
.
.80
24 0.16
OPALEPJ C5, 379 (1998)
3.20 +-12
.
.80
00 0.50
CDFPRD 61, 072005 (2000)
0.79 +-00
.
.44
14
LHCbPRL 115 (2015) 031601
0.73 0.04 0.02
Belle5SPRL 108 (2012) 171801
0.57 0.58 0.06
AverageHFAG
0.69 0.02
sin(2 ) sin(2 1)H F A GH F A GMoriond 2015PRELIMINARY
LHCb approaches precision on sin(2 ) from B-factories:
Current picture of corresponding φs
measurements fully consistent with SM
Data-driven studies of penguin pollution using Bs → J/ K* together with SU(3). Excellent experimental precision of < 0.015 on Δφs(J/ φ)
MoriondEW, Mar 19, 2016 Experimental Summary
Heavy flavour production at 13 TeV
measured heavy flavour production processes, such as prompt & non-prompt J/ , and B+(→ J/ K+) cross-sections. In agreement with predictions.
[TeV]s5 10
b]μ
[σ
0
5
10
15
20
ψJ/LHCb Prompt
[TeV]s5 10
b]μ
[σ
0
1
2
3
4
-b-fromψJ/LHCb FONLL
σ 1±FONLL,
-b-fromψJ/LHCb FONLL
σ 1±FONLL,
Fiducial region: pT < 14 GeV and 2.0 < y < 4.5
) [GeV]-μ+μ(T
p 5 6 7 8 910 20 30 40 50 60
Non
-pro
mpt
Fra
ctio
n
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0ATLAS Preliminary
, |y| < 0.75-1ATLAS 13 TeV, 6.4 pb
, 0.25 < |y| < 0.50-1ATLAS 7 TeV, 2.1 fb
, |y| < 0.75-1ATLAS 2.76 TeV, 4 pb
, |y| < 0.60-1) 1.96 TeV, 39.7 pbpCDF (p
Non-prompt contribution to total rate rises rise from approximately 25% at pT,μμ of 8 GeV to 65% at 40 GeV
b/G
eV]
μ [T
X)/
dp+
B→
(pp
σd
3−10
2−10
1−10
1
10|<2.4)
BData (13 TeV, |y
|<2.4)B
Data (7 TeV, |y
|<2.4)B
FONLL (13 TeV, |y
|<2.4)B
FONLL (7 TeV, |y
|<2.4)B
PYTHIA (13 TeV, |y
|<2.4)B
PYTHIA (7 TeV, |y
CMS Preliminary (13 TeV)-150.8 pb
) [GeV]± Kψ(J/T
p0 20 40 60 80 100
FO
NLL
σ /
dσd
0.5
1
1.5
2
Diff. cross section for |yB| < 2.4 and √s = 7, 13 TeV
Cross-sections rise mostly due to CM energy; harder pT spectrum at 13 TeV than at 8 TeV
Total σ(pp bb+X ) = 515 ± 2 ± 53 μb
Sanjay Kumar Swain
MoriondEW, Mar 19, 2016 Experimental Summary