some highlights of the babar experiment - tu dresdenschubert/talks/0410-zeuthen.pdf · 2004. 10....
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27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 1
PEP-II and BABARObservation of Direct CP Violation in B → K πDecays B → ccK and B → ssKCP Asymmetries in Decays B → ππ and ρρDescribing and Fitting Asymmetries in the Standard ModelThe CKM Matrix Element |Vcb|Test of CPT Symmetry, Tau and Charm, Radiative Return
K. R. Schubert, TU DresdenK. R. Schubert, TU Dresden
Seminar DESY Zeuthen, 27/10/04
Highlights ofthe BABAR Experiment
Some
+- +-
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27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 2
cpv K und B
∆t/τ(KS)
cpv2-k&b1999
N
106
105
104
103
102
A
0.4
0.2
0
-0.2
-0.4
K → π+π−
∆t/τ(KS)
1999
B→(cc)KS
B0
B0
N
A
BABAR
2004
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27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 3
Search for CPV(B) was not „blind“. There was a clearStandard-Model expectation:
e+
e-γ
ge ϒ(4S),10.58 GeVB0
B0
c sgw
K0
J/ψ
gs
g
Wgw
c
( ) ( )( ) ( ) ( )[ ].proddecay0000
0000
sin2sin//// ttm
KJBKJBKJBKJBA
SS
SS −∆⋅=→Γ+→Γ→Γ−→Γ
= βψψψψ
d
dgs
b
b
ge
Value of sin2β given by St.Model quark mixing: 0.5 – 0.8. But ≈ 3.107 BB events necessary!Best production method:
É
¿
10
Vub*/Aλ3 Vtd/Aλ3
β
α
γ
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27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 4
Plan reachedE [GeV] e- / e+ 9.0 / 3.1 yesI [A] e- / e+ 0.6 / 2.1 1.5 / 2.4L [cm-2 s-1] 3 x 1033 9.2 x 1033
Lint [pb-1/day] 135 710
The B-Meson Factory PEP-II
![Page 5: Some Highlights of the BABAR Experiment - TU Dresdenschubert/talks/0410-zeuthen.pdf · 2004. 10. 28. · German Contributions to the BABAR Calorimeter 10 % of 6580 CsI(Tl) crystals](https://reader036.vdocuments.mx/reader036/viewer/2022071421/611a804f983ec23ca6002f20/html5/thumbnails/5.jpg)
27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 5
Slac Site Photo
← Linac
← Fixed-TargetExperiments
← BABAR← SLD
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27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 6
Lumi curves
Daily and Integrated Luminosity, Oct 1999 - Aug 2004
Design
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27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 7
Best shift, no trickle
PEP-II Lumi
HER currentLER currentFrom the daily PEP-II protocols
Best shift, LER only trickleNov 2003
Best shift, double trickleMar 2004
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27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 8
Canada [4]U of British ColumbiaMcGill U MontrealU de MontréalU of Victoria
China [1]Inst. of High Energy Physics, Beijing
France [5]LAPP AnnecyLAL OrsayU Paris 6 et 7Ecole PolytechniqueCEA Saclay
Germany [5]RU BochumU DortmundTU Dresden U HeidelbergU Rostock
Great Britain [10]U of BirminghamU of BristolBrunel UniversityU of EdinburghU of LiverpoolImperial College LondonQueen Mary & Westfield CollegeRoyal Holloway U of LondonU of ManchesterRutherford Appleton Laboratory
Norway [1]U of Bergen
Russia [1]Budker Inst., Novosibirsk
Spain [1]Barcelona / Valencia
INFN PadovaINFN PerugiaINFN PisaINFN Roma INFN TorinoINFN Trieste
79 Institutes, 11 Countries, 608 Authors
e-
e+
The BABAR Collaboration
Italy [12]INFN BariINFN FerraraINFN Frascati INFN GenovaINFN MilanoINFN Napoli
Netherlands [1]NIKHEF Amsterdam
U of CincinnatiU of ColoradoColorado State UFlorida A&MHarvard UU of IowaIowa State ULBNL BerkeleyLLNL LivermoreU of LouisvilleU of MarylandU of MassachusetsMIT CambridgeU of MississippiMount Holyoke CollegeU of Notre DameOhio State UU of OregonU of PennsylvaniaPrairie View A&MPrinceton USLAC U of South CarolinaStanford UU of TennesseeU of Texas at AustinU of Texas at DallasVanderbiltU of WisconsinYale U New Haven
USA [38]SUNY AlbanyCaltech PasadenaUC IrvineUC Los AngelesUC RiversideUC San DiegoUC Santa BarbaraUC Santa Cruz
23 / 9 / 2004
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27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 9
detector picture
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27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 10
German Contributions to the BABAR Calorimeter
10 % of 6580 CsI(Tl) crystals
All photodiodes
Optimisation ofcrystal light yield
Mechanics of readout electronics
Lightpulser system for monitoring
Bhabha calibration
πo calibration
e identification
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27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 11
Direct CP Violation in B0 → K+π -
Tree and Penguin,
2 different weak phases:
CPV, if strong φ also differs.
d
Vub
d
b
s
u
ʉ
Wg
Vtsb s
uʉ
W
d dBABAR, PRL 93 (2004) 131801
227 M BB, A=[n(K-π+) -n(K+π -)] / [n(K-π+)+n(K+π -)], PID by DIRC (θC,nγ),
∆E = E*(Kπ) -√s/2, mES=√s/4 - p(Kπ)2,σ(∆E) = 27 MeV, σ(mES) = 2.6MeV.
Dominant Bg. e+e - →qq :
|cosθS(Kπ;rest)|<0.8
removes 80%.
Likelihood separation of
π+π -,K+π -,K-π+,K+K-, and bgusing ∆E, mES,2θC, Fisher.
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27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 12
Direct CP Violation in B0 → K+π– (2)
B0
B0
Likelihood fit gives
1606 ± 51 Kπ,
467 ± 33 ππ, 3 ± 12 KK,
consistent with measured BF.
A = -0.133 ± 0.030 ± 0.009 (4.2 σ).
More B0 than B0 decays.
First CP-violating observation
without any time information.
BELLE Aug. 2004
A = -0.101 ± 0.025 ± 0.005 (3.9 σ).
hep-ex / 0408100
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27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 13
Four Observed Types of CP Violation
1. CPV in K0K0 mixing: Re εK (not yet seen in B0B0 mixing)
2. CPV in mixing-decay interference: Im εK, sin2β(B→ccK), S(B0 →π+π-)
3. CPV in decays into one final state: Re ε‘, C(B0 →π+π-), A(B0 →K+π-)
4. CPV in decays into two final states: Im ε‘
Now Discussion of Type 2:
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27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 14
Measurement of time-dependent CP-Asymmetries
−Γ∆±
Γ∆ = ± ∆ ∆ ∆ ∆m, ( ) [1 sin cos ]
4 CP CP
tCP f d f df t e S m t C m t
Decay distributions f+ (f-) when tag = B0(B0) in Y(4S) → B0 B0
( ) ( )00LHd BmBmm −=∆
Asymmetry
λλ
−=
+
2
2
1 | |1 | |
CP
CP
CP
ff
f
C
λλ
=+ 2
2Im1 | |
CP
CP
CP
ff
f
S
+ −
+ −
−∆ = = ∆ ∆ − ∆ ∆
+( ) sin cos
CP CP CPf f d f df fA t S m t C m tf f
CPV parameter Type 3 CPV,or Type 1
000000 , BqpBBBqpBB HL −=+=
CP
CP
CP
CP
CP
CPf
ff
f
ff A
Apq
AA
pq
⋅⋅=⋅= ηλType 2 CPV
For fCP = J/ψ KS:λ = - e-i2β, C=0, S=sin2β
00 , BHfABHfA CPfCPf CPCP==
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27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 15
Measurement of time-dependent CP-Asymmetries (2)
( ) ( ) ( )( ) ( ) ( ) tt-t~t) msin(2sinD
/B/B
/B/Bt~A~
0000
0000
∆∆∆⋅∆∆⋅⋅=Ψ→Γ+Ψ→Γ
Ψ→Γ−Ψ→Γ=∆ ∫ dr
KJKJ
KJKJ
SS
SS β
4: Flavour Determination of the other B Meson (“tag”)
1, 2, 3: B Reconstruction into CP Eigenstate
Υ(4S) e+
βγ = 0.55
6: Determination of ∆t = ∆z/βγc
5: Determination of the fraction w of mistags
Dilution D = (1-2w) reduces observed asymmetry.
8: sin2β Fit to both Time Distributions
7: Determination of the ∆z reso-lution function
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27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 16
ϒ
flavour eigenstate, here from B0,decay at t1 „tags“ the flavour
of the other B at time t1.
Such events are very rare, o(10-6), therefore we use inclusive tagging for CPA measurements with now Q = ηtagD2 = 0.30.
A fully reconstructed event
CP eigenstate, decay at t2,either from B0 or from B0,
∆t = t2-t1.
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27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 17
Newest BABAR Results on Asymmetries in B→ccK
227 M BB, cc = J/ψ, ψ(2S), χc1, ηc with KS (ηCP = -1),
J/ψ with KL (ηCP = +1) and K0* (ηCP,eff = +0.51),
Q = 0.305 ± 0.004.
hep-ex / 0408127
βλ
= + ± ±= = ± ±
sin2 0722 0.040 0.023/ 0.950 0.031 0.013
.A A
KS KL
BELLE 2003: 0.733±0.057±0.028
WA: 0.726 ± 0.037 (19.5σ)
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27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 18
CP Asymmetries in B0 → φKφ
d
g
Vts
d
b s
ss
W
Pure penguin, expect λf = ηf e-2iβ
- ηf S(φ) = sin2β = 0.73, C (φ) =0.
KS
KL
BF = (7.6 ± 1.3 ± 0.5)10-6
BABAR, hep-ex / 0408072 227 M BB
114±12 KS, -ηS= +0.29±0.3198±18 KL, -ηS= +1.05±0.51
-ηS = +0.50 ± 0.25
C = 0.00 ± 0.23 ± 0.05
+0.07-0.04
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27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 19
CP Asymmetries in B0 → η‘K BF = (55.4 ± 5.2 ± 4.0)10-6
η‘
d
g
Vts
d
b s
ss
W
d
Vub
d
b
su
ʉ
W
Since uʉ in η‘ reached
by a tree, C(η‘) ≠0,
S(η‘) ≠ -sin2β possible:
BABAR, hep-ex / 0408090
819 ± 38 events
S = 0.27± 0.14 ± 0.03
≠ 0.73 with 3.0 σ
C = -0.21 ± 0.10 ± 0.03
227 M BB
only KS
→ π+π− and π0π0
η‘ → ρ0 γ and
η‘ → ηπ+π−,
η → γγ, π+π− π0
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27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 20
Summary on sin2β CP-Asymmetries
BELLE, all newBABAR, all new
2.4σ from s-penguin to sin2β (cc)
combined: 3.6 σ New Physics? Needs urgently more data.
2.7σ from s-penguin to sin2β (cc)
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27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 21
Measurements of the Angle α
É
¿
10
Vub*/Aλ3 Vtd/Aλ3
β
α
γ
Measurable in decaysB0,B0 → π+π-, π±ρ± and ρ+ρ-
with same tagged ∆t-depenent asymmetry as in B0,B0 → J/ψ KS
d
W
Vcb
d
b c
cs
J/ψ KS: Tree
A(∆t)=sin2β sin∆m∆t A(∆t) = Ccos∆m∆t + Ssin∆m∆t
if tree only: C=0, S=sin2α
if tree + penguin: C≠0, S=sin2αeff, models or Gronau-London for α-αeff.
d
Vub
d
b
dʉ
u
π+π-, π±ρ±, ρ+ρ-: Tree plus Penguin
W
d
g
Vtd
d
b d
ʉu
W
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27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 22
CP Asymmetries in B0 → π+π− BABAR, hep-ex / 0408089 227 M BB
C2 + S2 ≤ 1
Experiment Sππ Cππ = - Aππ
BABAR 2004 -0.30 ± 0.17 ± 0.03 -0.09 ± 0.15 ± 0.04
BELLE 2004 -1.00 ± 0.21 ± 0.07 -0.58 ± 0.15 ± 0.07
HFAG avg. -0.61 ± 0.14 -0.37 ± 0.11DisagreementScaled average
2.5 σ-0.61 ± 0.22
2.2 σ-0.37 ± 0.16
Even with scaled
errors there is
evidence for CP
violation in π+π−,
2.8 σ for type-2,
2.3 σ for type-3.
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27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 23
Gronau-London ππ Isospin Analysis PRL 65 (1990) 3381
requires B+ π+ π0, B- π - π0 rates,
t-dependent rates of tagged B0 π + π -, t-integrated rates of tagged B0 π0 π0
and B0 π0 π0
in order to determine θ = αeff - α.
2θ2/−+A
2/−+A00A
00A
00 ++ = AA
Measurement of B0B0 π0 π0 average gives only limit on θ .
BF(B0 → π+π−) = (4.6 ± 0.4) 10-6 and C give A+- and A+-,BF(B+ → π+π0) = (5.6 ± 0.6) 10-6 gives A+0,
BF(B0 → π0π0) = (1.51 ± 0.28) 10-6 gives limits on A00 and A00
α α ≤ o- 35 at 90% CLeff Much better situation in ρρ:
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27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 24
CP Asymmetries in B0 → ρ+ρ−
L.Roos (BABAR), Moriond (EW) 2004
122 M BB
vector-vector mode with 3 final
states, 2 with ηCP=+1, one with -1.
Results: BF = (30 ± 4 ± 5)10-6
flong = 0.99 ± 0.03
Dominated by ηCP=+1
Slong = -0.19 ± 0.33 ± 0.11
Clong = -0.23 ± 0.24 ± 0.14
B+ ρ+ρ0 BF = ( 26.4 ± 6.4 ) 10-6 (BABAR & BELLE)flong = 0.962 (BABAR & BELLE)
B0 ρ0 ρ0 BF < 1.1 10-6 (90% CL) BABAR new with 227 M BB
+0.049- 0.065
BABAR, hep-ex / 0408061
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27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 25
Gronau-London ρρ Isospin Analysis BABAR, hep-ex / 0408061
The ρ+ρ− asymmetry results
Slong = -0.19 ± 0.33 ± 0.11
Clong = -0.23 ± 0.24 ± 0.14
do not violate CP but give
very good information on α:
α = (96 ±10stat ± 4sys ±11GL+elw.pg)o
1σ
90%
É
¿
10β
α
γ
VtdVtb*/(-VcdVcb
*)VudVub*/(-VcdVcb
*)
At this moment, the fourbest constraints on the CKM matrix are Vud, Vcb,β from B → ccK, andα from B → ρ+ρ−.
d
γ, Zb
ʉ
ud
d
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27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 26
A Short Reminder of the CKM Matrix
νeL
e-L
Wgw
tL
b‘LW
gw
cL
s‘LW
gw
uL
d‘LW
gw
bVsVdVb
bVsVdVs
bVsVdVd
tbtstd
cbcscd
ubusud
⋅+⋅+⋅=
⋅+⋅+⋅=
⋅+⋅+⋅=
'
'
'
bVsVdVb
bVsVdVs
bVsVdVd
tbtstd
cbcscd
ubusud
⋅+⋅+⋅=
⋅+⋅+⋅=
⋅+⋅+⋅=
***'
***'
***'
( ) ( ).2/1,2/1
.0
1)1(2/1
)(2/1
22
***
23
22
32
ληηλρρ
ληρλλλλ
ηρλλλ
−⋅=−⋅=
=++
⎟⎟⎟
⎠
⎞
⎜⎜⎜
⎝
⎛
−−−−−
−−≈
tbtdcbcdubud VVVVVV
AiAA
iAV
Vij describes quark mixing as
consequence of Higgs
couplings to quarks. If Vij ≠ Vij*,
Higgs couples differently
to q and q and produces CPV.
![Page 27: Some Highlights of the BABAR Experiment - TU Dresdenschubert/talks/0410-zeuthen.pdf · 2004. 10. 28. · German Contributions to the BABAR Calorimeter 10 % of 6580 CsI(Tl) crystals](https://reader036.vdocuments.mx/reader036/viewer/2022071421/611a804f983ec23ca6002f20/html5/thumbnails/27.jpg)
27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 27
ckmLfit-0405-4
É¿ Fit to Measurements of Vub, Vtd, εK, and sin2β
εK sin2β
Vtd
Lfitckm
Vub
ckmLfit, May 2004
![Page 28: Some Highlights of the BABAR Experiment - TU Dresdenschubert/talks/0410-zeuthen.pdf · 2004. 10. 28. · German Contributions to the BABAR Calorimeter 10 % of 6580 CsI(Tl) crystals](https://reader036.vdocuments.mx/reader036/viewer/2022071421/611a804f983ec23ca6002f20/html5/thumbnails/28.jpg)
27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 28
ckmLfit-0410-1
Including the newest BABAR measurements of β and α
εK sin2β
Vtd
Lfitckm
Vub
ckmLfit, October 2004
![Page 29: Some Highlights of the BABAR Experiment - TU Dresdenschubert/talks/0410-zeuthen.pdf · 2004. 10. 28. · German Contributions to the BABAR Calorimeter 10 % of 6580 CsI(Tl) crystals](https://reader036.vdocuments.mx/reader036/viewer/2022071421/611a804f983ec23ca6002f20/html5/thumbnails/29.jpg)
27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 29
ckmLfit-0410-1 with fit results
Including the newest BABAR measurements of β and α
εK sin2β
Vtd
Lfitckm
Vub
γγ
λ = |Vus|= 0.2240 ± 0.0038, Aλ2 = |Vcb|=0.0416 ± 0.0008,
Aλ3√ρ2+η2 = |Vub|=0.0038 ± 0.0003, γ = 60o ± 11o.
γ
ckmLfit, October 2004
![Page 30: Some Highlights of the BABAR Experiment - TU Dresdenschubert/talks/0410-zeuthen.pdf · 2004. 10. 28. · German Contributions to the BABAR Calorimeter 10 % of 6580 CsI(Tl) crystals](https://reader036.vdocuments.mx/reader036/viewer/2022071421/611a804f983ec23ca6002f20/html5/thumbnails/30.jpg)
27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 30
Γ(B → Xcℓν)
BABAR‘s Newest Vcb Determination PR D 69 (2004) 111103
PR D 69 (2004) 111104
PRL 93 (2004) 011803
Two measurements of moments in
inclusive decays B → Xcℓν
m(Xc)
E(ℓ)
HQE:
q q
Vcb
bνℓ
cW
1
g n qn q Quark level rate
with and HQE parameters mb,mc,µπ,µG,ρD, and ρLS . These
parameters are not calculated but fitted to measurements of 20 moments
of dΓ/dEℓ and 28 of dΓ/dmX. These 48 moments are different functions
of the same 6 parameters. With τB as only external input, the fit determines
mb,mc,µπ,µG,ρD,ρLS,and |Vcb| and BF(B → Xc ℓν) = Γ(B → Xc ℓν) . τB .
![Page 31: Some Highlights of the BABAR Experiment - TU Dresdenschubert/talks/0410-zeuthen.pdf · 2004. 10. 28. · German Contributions to the BABAR Calorimeter 10 % of 6580 CsI(Tl) crystals](https://reader036.vdocuments.mx/reader036/viewer/2022071421/611a804f983ec23ca6002f20/html5/thumbnails/31.jpg)
27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 31
B → Xeν
ϒ(4S) → B B → e± e± X, 52 M BB
a) e+(p)e-(>1.4GeV)e-(p)e+(>1.4GeV)
b) e+(p)e+(>1.4GeV)e-(p)e-(>1.4GeV)
a)
b)
(1) Lepton Energy Moments
As function of Emin, determine( )
( )
( ) ( )[ ]
( ) ( )[ ] dEdEdEME
MEM
dEdEdEME
MEM
dEdEdE
MEM
dEdEdEM
E
E
E
E
∫
∫
∫
∫
Γ−=
Γ−=
Γ=
Γ=
min
min
min
min
3min1
0min3
2min1
0min2
0min1
min0
1
1
1
![Page 32: Some Highlights of the BABAR Experiment - TU Dresdenschubert/talks/0410-zeuthen.pdf · 2004. 10. 28. · German Contributions to the BABAR Calorimeter 10 % of 6580 CsI(Tl) crystals](https://reader036.vdocuments.mx/reader036/viewer/2022071421/611a804f983ec23ca6002f20/html5/thumbnails/32.jpg)
27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 32
(2) Hadronic-Mass Moments ϒ(4S) → Breco Brecoil → Breco ℓνX
89 M BB, Observed mass of the X system for
Eℓ >0.9GeV Eℓ >1.6GeV Correction
<mXn>obs → <mX
n >true
using Monte Carlo
As function of Emin, determine
for n = 1, 2, 3, 4.
( ) ( ) ( )X
XX
X
nXn dm
dmEEddm
dmEEdmEM ∫∫
>Γ>Γ= minmin
minll
![Page 33: Some Highlights of the BABAR Experiment - TU Dresdenschubert/talks/0410-zeuthen.pdf · 2004. 10. 28. · German Contributions to the BABAR Calorimeter 10 % of 6580 CsI(Tl) crystals](https://reader036.vdocuments.mx/reader036/viewer/2022071421/611a804f983ec23ca6002f20/html5/thumbnails/33.jpg)
27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 33
Mass
Moments
Energy
Moments
Because of high correlations, only 27 of the 48 moments enter into the fit.
χ2 =15.0 for NDoF =20. Fit results in Uraltsev‘s „kinetic scheme“:
(3) Moment Results and HQE Fits
Emin (GeV)
mb(1 GeV) – mc(1 GeV) = (3.44 ± 0.03exp ± 0.02HQE ± 0.01αs) GeV
GeVGeVmGeVGeVm
eXBBrV
c
b
c
cb s
)02.006.007.018.1()1()02.004.005.061.4()1(
)%06.016.061.10()(10)6.02.04.04.04.41(||
s
s
SL
HQEexp
HQEexp
HQEexp
3HQEexp
α
α
α
ν
±±±=±±±=
±±=→×±±±±= −
Γ ± 2.0%
![Page 34: Some Highlights of the BABAR Experiment - TU Dresdenschubert/talks/0410-zeuthen.pdf · 2004. 10. 28. · German Contributions to the BABAR Calorimeter 10 % of 6580 CsI(Tl) crystals](https://reader036.vdocuments.mx/reader036/viewer/2022071421/611a804f983ec23ca6002f20/html5/thumbnails/34.jpg)
27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 34
⎟⎟⎠
⎞⎜⎜⎝
⎛⎥⎦
⎤⎢⎣
⎡⎟⎟⎠
⎞⎜⎜⎝
⎛ΓΓΓΓ
−⎟⎟⎠
⎞⎜⎜⎝
⎛=⎟⎟
⎠
⎞⎜⎜⎝
⎛=⎟⎟
⎠
⎞⎜⎜⎝
⎛∂∂
2
1
2221
1211
2221
1211
2
1
2
1
2 ψψ
ψψ
µψψ i
mmmm
ti ik
CPT- and ∆Γ-Independent Measurement of B0B0 Mixing
mik and ΓikHermitean
( )( ) .2/,)(
,2/,)(000
000
HHHt
H
LLLt
L
mieBqpBtB
mieBqpBtBH
L
Γ+=⋅−=
Γ+=⋅+=−
−
γ
γγ
γ
If CPT, m11=m22, Γ11=Γ22, andCPV(Type1)1 ⇔≠
pq
sin2β analysisassumes ΓL= ΓH
If CPT violated, also two eigenstates BL, BH
[ ][ ] t
H
tL
H
L
eBqBptB
eBqBptBγ
γ
δδ
δδ−
−
⋅⋅+⋅−⋅−⋅=
⋅⋅−⋅+⋅+⋅=000
000
2121)(
2121)(symmetry CPT with as
2/2/
1212
2121
Γ−Γ−
=mm
pq
( )
( ) ( ).2/Im
,/Re,
2/i2/i,2/,2/
,Im211,/Re2,2
11221122
12
1212121212
mmm
mmmmm
mpqmmmmmm LHLH
∆Γ−≈∆≈
∆Γ−∆Γ−
=Γ−Γ=Γ−=
Γ−≈Γ≈Γ−Γ=∆Γ≈−=∆
δδδδδδδδδ ,
2/i2/i
∆Γ−∆Γ−
=mm δδδ
![Page 35: Some Highlights of the BABAR Experiment - TU Dresdenschubert/talks/0410-zeuthen.pdf · 2004. 10. 28. · German Contributions to the BABAR Calorimeter 10 % of 6580 CsI(Tl) crystals](https://reader036.vdocuments.mx/reader036/viewer/2022071421/611a804f983ec23ca6002f20/html5/thumbnails/35.jpg)
27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 35
For pairs Btag Brec from the Y(4S) we have with ∆t = trec-ttag:
( ) ( )⎥⎦
⎤⎢⎣
⎡∆∆⋅+⎟
⎠⎞
⎜⎝⎛ ∆
∆Γ⋅−∆∆⋅+⎟
⎠⎞
⎜⎝⎛ ∆
∆Γ⋅∝ −+∆Γ tmststmctc
tN sinIm
2sinhRecos
22cosh
2e
dd t-
Coefficients c+,c-,s given as functions of Af, |q/p|, δ, λf = qAf/pAf , e.g.:BtagBrec
B0 B0
B0 B0
B0 B0
B0 B0
B0 BCP
B0 BCP
c+
f may be flavour
(D*π...)[„Bflav“]
or CP eigenstate
(J/ψ KS...)[„BCP“]
0
0,2
0,4
0,6
0,8
1
-8 -6 -4 -2 0 2 4 6 8
unmix(0)mix(0)unmix(0.4)mix(0.4)
N BtagBflav
∆Γ/Γ =0 and 0.4
∆t [Γ-1]0
0,2
0,4
0,6
0,8
1
-8 -6 -4 -2 0 2 4 6 8
Btag(0)Bbartag(0)Btag(0,4)Bbartag(0,4)
N
∆t [Γ-1]
BtagBCP
sin2β=0.7same ∆Γ/Γ
![Page 36: Some Highlights of the BABAR Experiment - TU Dresdenschubert/talks/0410-zeuthen.pdf · 2004. 10. 28. · German Contributions to the BABAR Calorimeter 10 % of 6580 CsI(Tl) crystals](https://reader036.vdocuments.mx/reader036/viewer/2022071421/611a804f983ec23ca6002f20/html5/thumbnails/36.jpg)
27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 36
Effects of ∆Γ and CPT Violation on dN/d∆t :
Dt(Flavour-tag and CP-rec)
0
0,2
0,4
0,6
0,8
1
-8 -6 -4 -2 0 2 4 6 8
Btag(z=0,DG=0)Bbartag(z=0,DG=0)Btag(z=0.4,DG=0)Bbartag(z=0.4,DG=0)Btag(z=0.4i,DG=0)Bbartag(z=0.4i,DG=0)Btag(z=0,DG=0.4)Bbartag(z=0,DG=0.4)
N
∆t [Γ-1]
Re δ: - + + -Im δ: + + - -∆Γ: - - - -
BtagBCP
sin2β = 0.7
∆Γ/Γ=0.4
δ = - 0.2
δ = - 0.2 i
![Page 37: Some Highlights of the BABAR Experiment - TU Dresdenschubert/talks/0410-zeuthen.pdf · 2004. 10. 28. · German Contributions to the BABAR Calorimeter 10 % of 6580 CsI(Tl) crystals](https://reader036.vdocuments.mx/reader036/viewer/2022071421/611a804f983ec23ca6002f20/html5/thumbnails/37.jpg)
27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 37
BABAR analysis with 88 M BB PRL 92 (2004) 181801
flavour samples
D(*)π, D(*)ρ, D(*)a1, J/ψK*0
20 600 events
CP samples
J/ψK0S, ψ(2S)K0
S, χc1K0S. J/ψK0
L
1 200 events
![Page 38: Some Highlights of the BABAR Experiment - TU Dresdenschubert/talks/0410-zeuthen.pdf · 2004. 10. 28. · German Contributions to the BABAR Calorimeter 10 % of 6580 CsI(Tl) crystals](https://reader036.vdocuments.mx/reader036/viewer/2022071421/611a804f983ec23ca6002f20/html5/thumbnails/38.jpg)
27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 38
BABAR results on ∆Γ and δ
|q/p| = 1.029±0.013 ±0.011
Dileptons:0.998±0.006±0.007Combined: 1.005±0.008
No CPV observedin mixing.
sign(Reλ).∆Γ/Γ =-0.008±0.037±0.018|∆Γ/Γ| < 0.08 (90% CL)
|δm/Γ| < 0.05 (90% CL)
δΓ/Γ ∈ [-0.08, 0.02] (90%)
and:Neither ∆Γ/Γ nor CPT violation influence BABAR‘s sin2β.
2|δ|
![Page 39: Some Highlights of the BABAR Experiment - TU Dresdenschubert/talks/0410-zeuthen.pdf · 2004. 10. 28. · German Contributions to the BABAR Calorimeter 10 % of 6580 CsI(Tl) crystals](https://reader036.vdocuments.mx/reader036/viewer/2022071421/611a804f983ec23ca6002f20/html5/thumbnails/39.jpg)
27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 39
BABAR Highlights in Charm Physics
m(Dsπ0), GeV
DsJ(2317)
PRL 90 (2003) 242001
DsJ(2458)all Dsπ0γ
Ds*π0
Ds(2317)γ
PR D 69 (2004) 031101
Limit on D0D0 Mixing:
D*+ → D0 π+
→ K-π+
→ K+π- 3.6.10-3
→ D0 → K+π- <1.6.10-3
PRL 91 (2003) 171801
![Page 40: Some Highlights of the BABAR Experiment - TU Dresdenschubert/talks/0410-zeuthen.pdf · 2004. 10. 28. · German Contributions to the BABAR Calorimeter 10 % of 6580 CsI(Tl) crystals](https://reader036.vdocuments.mx/reader036/viewer/2022071421/611a804f983ec23ca6002f20/html5/thumbnails/40.jpg)
27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 40
BABAR Highlights in Tau Physics
80 M ττ PRL 92 (2004) 121801
Limits on Neutrinoless Decays: Tau Lifetime:
71 M ττ A. Lusiani (BABAR), TAU04
ττ = (289.4 ± 0.91 ± 0.90) fs
![Page 41: Some Highlights of the BABAR Experiment - TU Dresdenschubert/talks/0410-zeuthen.pdf · 2004. 10. 28. · German Contributions to the BABAR Calorimeter 10 % of 6580 CsI(Tl) crystals](https://reader036.vdocuments.mx/reader036/viewer/2022071421/611a804f983ec23ca6002f20/html5/thumbnails/41.jpg)
27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 41
Radiative Return (ISR)
γISR
mππ < Ecm < mY4S
e+e- → π+ π− π0 γ
B(J/ψ →3π) = (2.18±0.19)% BABAR prelim.(1.50±0.20)% PDG (2.10±0.12)% BES 2003
e+e- → π+ π− π+ π− γ
B(J/ψ →π+π−π+π−) =(3.61±0.26 ±0.26)⋅10-3 BABAR prelim.(4.0±1.0) ⋅10-3 PDG
![Page 42: Some Highlights of the BABAR Experiment - TU Dresdenschubert/talks/0410-zeuthen.pdf · 2004. 10. 28. · German Contributions to the BABAR Calorimeter 10 % of 6580 CsI(Tl) crystals](https://reader036.vdocuments.mx/reader036/viewer/2022071421/611a804f983ec23ca6002f20/html5/thumbnails/42.jpg)
27 / 10 / 04 K. R. Schubert (TU Dresden), Seminar DESY Zeuthen 42
The End
BABAR takes data since October 1999
244/fb recorded, best day 710/pb, (ARGUS 1982-92: 500/pb).
Software problems essentially solved, analysis worldwide
(prompt reconstruction in Padova, skimming in Karlsruhe)
100 Publications in PR-D and PRL
No „New Physics“ discovered, CP Violation is St. Model CPV
CP Violation continues to be the main topic
Precision measurements of CKM matrix elements continue to be
very important for testing if CPV contains New Physics, |Vub|
2.7 σ hint for New Physics in CPV in ssK penguin decays
Strong motivation for studies of a Super-B-Meson-Factory
Come to D. MacFarlane‘s talk here on 10 November