yu. kudenko and m . khabibullin institute for nuclear research, moscow
DESCRIPTION
Neutrino oscillations : recent results and perspectives. Yu. Kudenko and M . Khabibullin Institute for Nuclear Research, Moscow. IHEP, Protvino , Russia, 27 June 2013. OUTLINE neutrino oscillations long baseline accelerator experiments measurements of 13 - PowerPoint PPT PresentationTRANSCRIPT
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Yu. Kudenko and M. Khabibullin
Institute for Nuclear Research, Moscow
Neutrino oscillations: recent results and perspectives
IHEP, Protvino, Russia, 27 June 2013
1XXIX-th International Workshop on HEP, Protvino 26-28 June, 2013
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OUTLINE
neutrino oscillations
long baseline accelerator experiments
measurements of 13 - accelerator experiments - reactor experiments
near and far future perspectives
2XXIX-th International Workshop on HEP, Protvino 26-28 June, 2013
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Standard Model
LEP experiments: from the width of Z
Three active neutrinos
Three neutrino flavours: e Neutrino – partner of charged lepton: W ee W W
Neutrinos – massless particlesLepton numbers Le L L conservationNeutrino oscillations forbiddenCP = 1 in lepton sector
N = 2.984 ± 0.008
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Neutrino oscillation hypothesis
e
L
- neutrino – antineutrino transitions- non-zero mass and mixture of neutrinos- oscillation probability depends of neutrino mass, neutrino energy E and path length L
source detector
e
3
2
1
Ue
3
2
1
mmmWeak interaction
eigenstatesMass eigenstates
B. Pontecorvo: the idea of massive neutrino and oscillations – 1957
Weak (active) eigenstates are not equal to mass eigenstates4XXIX-th International Workshop on HEP, Protvino 26-28 June, 2013
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2 types of oscillation experimentsBaseline, L fixedNeutrino energy, E measured
Oscillation experiments:Appearance and Disappearance
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w/o oscillation
m2 =2.8 x 10-3 eV2 sin22 = 1.0
K2K: first LBL experiment
K2K confirmed SK result: oscillations of atmospheric neutrinos
Null oscillation probability = 0.0050%(4.1)
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MINOS
5.4 kT Far Detector~1 kT Near Detector
Proton beam: 120 GeV protons - beam: - 92.9%, anti-- 5.8%, (e + anti-e)- 1.3%, peak energy ~(3-9) GeV
Far Detector 5.4 kton magnetized Fe/Sci Tracker/Calorimeterr Near Detector 980 ton at L 1 kmthe same technology inboth detectors
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|Δm|2=(2.35+0.11-0.08) x 10-3 sin2(2)>0.91 (90% CL)
anti-Δm2=(2.64+0.28-0.27) x 10-3 sin2(2)>0.78 (90% CL
2894 events detected in MINOS Far Detector 3564 events expected in the absence of oscillations
226 events detected in MINOS Far Detector 312 events expected in the absence of oscillations
J.de Jong, NOW2012MINOS
no tension between neutrinos and antineutrinos
anti-almost finalresult
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arXiv:1304.6335
MINOS: combined + anti-
a hint on non-maximal mixing angle 23
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OPERA
High energy, long baseline beam( E 17 GeV L ~ 730 km )
direct search
pure beam: 2% anti ; <1% e
P( ) = cos413sin223sin2[1.27m223L(km)/E(GeV) ]
E/L ~ 2.310-2 10m223 (atm)
kink
Expectation after 5 years data taking:~22000 interactions~120 interactions~10 reconstructed<1 background event
Target mass ~1300t
Main background
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For |m|2 =2.5 x 10-3 eV2
18.9x1019 POT
2.7 tau events expected
0.3 events background
3 candidates observed
1st event
2nd event
OPERA
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Oscillation results
atm
sol
CHOOZ +atm + LBLsin2(2θ13)<0.11 (90%CL)
Solar + KamLAND
SK + K2K + MINOS
LSND
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By June 2011
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2
1
1212
1212
1313
1313
2323
2323
1 0 0 0 cos sin -0 sin cos
cos 0 sin-
0 1 0 sin 0 cos
cos sin- 0sin cos 00 0 1
i
ie
e
e
321
321
321
UUUUUUUUU
Ueeee
U1
2
3
oscillations and mixing
atmosphericsolar
link between atmospheric and solar
U parameterization: three mixing angles 12 23 13
CP violating phase 222jiij mmm
0231
223
212 mmm
two independent m2
232
231
223
eV104.2
atmm
mm
3 families
23~450
Standard Model: neutrinos are massless particles
eV017.5 252212
solmm
12~340
sin2213 < 0.15 at 90% CL by June 201113XXIX-th International Workshop on HEP, Protvino 26-28 June, 2013
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Before Summer 2011
only upper limit on 13 23 maximal? mass hierarchy (sign of m31
2) no hint on CP violation
T.Schwetz, M.Tortola,J.Valle, hep-ph:1103.0734v2
?? 13 , mass hierarchy , ??
~2.5x10-3eV2
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Importance of 13
- Zero value of 13 would be a hint on a new symmetry (tri-bi-maximal)
- Zero value of 13 would eliminate a possibility for the CKM mechanism in neutrino mixing
- A non-zero value of 13 opens a door for searching of leptonic CP violation
- A non-zero (and not small) value of 13 gives good chances for measurement of mass hierarchy and CP violation in neutrino oscillations using present neutrino beams and detectors
The size of 13 Future Program of neutrino physics
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Tokai
SuperK
LONG-BASELINE NEUTRINO OSCILLATION EXPERIMENT
JAPANTokyo
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Т2 : - К search for e - measurement of 13
- - СР violation
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TargetHornsDecay Pipe
SuperK
Off-axis beam conception:neutrino detectors are placed at a small angle with respect to theproton beam
With 2.5 degree off-axisangle the neutrinoenergy is tuned to theoscillation maximum
- >500 members from 12 countries- Russia: INR RAS
ND280 J-PARC
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SuperKamiokande – Т2К Far Detector
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50 kt of pure water; Fiducial Volume: 22.5 ktInner Detector: >11000 PMTs (20”)Outer Detector: ~2000 PMTs (8”)(see talk by M. Smy)
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About two years ago, T2K published FIRST clear indication
of electron neutrino appearance ( 13 ≠
0)
Expected BG1.5±0.3evts
6 e events First T2K result
published in June 2011
Then,1 - Confirmation from MINOS2 - Precise measurements by Double Chooz Daya Bay RENO
1.43x1020 POTJanuary 2010 – March 2011
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Energy spectra of e events
KS = 47.5%
Detected 11 evensExpected 3.3 0.4(syst) events for 13=0, NH and = 0
Run1 + Run2 + Run3
e events
p-value = 6%
3.1 observation of e
3.01x1020 POTStatistics accumulated from January 2010 to July 2012
T2K Collaboration, arXiv:1304.0841
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T2K: e events July 2012
Probability (p-value) to observe 11events for 13 = 0 0.08%
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13 and
Daya Bay
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13 0
T2K
MINOS
DChooz Daya Bay Reno
Reactor experiments
Accelerator experiments
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T2K first indication of θ13 ≠ 0 3.1σ significance MINOS θ13 =0 disfavored at 1.7 σ
Double Chooz θ13 ≠ 0 at 3.1σ Daya Bay
e
e
ee
sin²2θ13 = 0.089 ± 0.010(stat) ± 0.005(syst) ~ 8σ significance
RENO sin²2θ13 = 0.113 ± 0.013(stat) ± 0.019(syst) 4.9σ significance
ee
ee
θ13 has been well measured by 5 experiments
MINOS
13: one year storyfrom upper limit to precise measurement !
13 9 1 deg
R.Barbiery ICHEP2012
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Measurement: 58 events observed Monte Carlo: 196.2 events no oscillationsMonte Carlo: 57.8 events with oscillations
Run 1+Run 2 Run 3
T2K: disappearance3.1x1020 POT
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T2K:
T2K obtained best sensitivityto mixing angle 23
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Sterile neutrinos
strong tension between appearance and disappearance data
tension between signals and negative results
MiniBooNe/LSND, reactor, Ga anomalies
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CP-even
CP-odd
Solar
Matter
ijijijij cs cos sin GeVEcmgEnGeVa eF
352 106.722
)( eP aa
e in matter
change sign for NH IH
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13 0The strength of CP violation in neutrino oscillations
JCP = Im(Ue1U2Ue2U
1) = Im(Ue2U3Ue3U
2) = = cos12sin12cos213sin13cos23sin23sin
Jarlskog invariant JCP
Quark sector JCP 310-5
Lepton sector JCP 0.02sin
all mixing angles 0 JCP 0 if 0
Real chance to test CP violation in neutrino oscillations
JCP
neutrinos quarks
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CP measurements
P( e) for sin2213=0.1
If 13 0 and not too smallmeasurement of in LBL accelerator experiments
132
13
12212
sin~)(
sinsin
2sin4)()(
)()(
e
ee
eeCP
P
ELm
PPPP
A
(1)
(2)
- wide energy muon neutrino beam- measurements of two oscillation maxima
- neutrino and antineutrino beams- massive far detector
and anti- narrow beams tuned to 1st oscillation maximum
wide (anti-) beam to cover 1st and 2nd oscillation maxima
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LBL experiments: near and far future
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Matter effect in LBL experiments
E 2 GeV
Nova LBNE
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Nova
R.Patterson, Neutrino 2012
Neutrino off-axis narrow-band beam from FNAL L = 810 km, E~2GeV, 700 kW beam power
Experiment will start data taking in late 2013
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Nova: early sensitivityM.Messier talk Prague CP violation Colloquium, May 2013
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T2K and Nova C.Backhouse, NNN Workshop, 4-6 October 2012
Possible measurement of mass hierarchy and CP violation
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LBNE
Neutrino beam from FNAL to HomestakeL = 1300 km, Ep=120 GeV, 700 kW NuMI beam, E = 0.5 – 5 GeV
Far detector 10 kt LAr TPC, on surfaceNo near detector
The US based LBL project
Sensitivity to MH and CP phase
e
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LBNE: Far Detector conceptM.Diwan, talk at ISOUP13
Later phase: 34 kt LAr TPC underground
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LBNE: Near Detector options
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LBNE: sensitivity to
Several options for LBNE far detector
arXiv:1110.6249
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T2HKT.Nakaya, NNN2012
3
The LBL project in Japan e
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MH is known !
T2HK: CPV discovery potential
High sensitivity to CP phase for systematics < 5%
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LAGUNA-LBNOWide-band neutrino beam from CERN to Pyhasalmi (Finland)
Depth 1400 m 4000m.w.e.
Far neutrino detectors
LAr + MIND
LENA
e
14 countries,47 institutions300 membersRussia:INRPNPI
Near detector
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P (e)
matter effect - easy to measure MH - more difficult CP violation
2nd maximum 1st maximum
LAGUNA-LBNO
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MH: 100% at >5 CPV: ~60% at 3
CERN SPS 400 GeV POT(x 1020)
Sensitivity LAGUNA-LBNO
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S.Wojcicki, NNN2012
and MH
P( e)
P(an
ti-
a
nti-
e)
295km
810km
1300km
2300km
LBL experiments
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Conclusion
- 3 neutrino mixing angles are measured and non-zero
- Large 13 opens door for searching of CP-violation in lepton sector
- Time to start MH and measurements
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