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Transcript of Rare B Decays at Mousumi Datta University of Wisconsin, Madison On behalf of the BaBar Collaboration...
Rare B Decays at
Mousumi DattaUniversity of Wisconsin, Madison
On behalf of the BaBar Collaboration
XII International Workshop on Deep Inelastic Scattering 14-18 April 2004
22
OutlineOutline Introduction
Motivation Experimental techniques
Rare hadronic B decays Radiative and electroweak B decays Purely leptonic B decays Summary Summary
All results are preliminary unless referenced.
DIS 2004Mousumi Datta, University of Wisconsin-Madison
33DIS 2004Mousumi Datta, University of Wisconsin-Madison
SM and Rare B DecaysSM and Rare B Decays Good agreement between Standard Model (SM) and the experimental results up to now.. To be sensitive to possible new physics (NP) and to test SM consider decays with small SM rates. Look at : Look at :
Processes dominated by penguin loops CKM suppressed decays Purely leptonic decaysR
are
B
Deca
ys
44
SM and Rare B Decays (cont’)SM and Rare B Decays (cont’)
New physics particles in loops
might show up in:
Different rates, kinematic distributuios than SM only
Different CP violation than SM only
DIS 2004Mousumi Datta, University of Wisconsin-Madison
Constrain the SM Time dependent CP measurements (L. Li Gioi’s talk) Direct (time integrated) CP measurement Decay rates
Compare theoretical predictions Constrain CKM parameters : |Vtd/Vts| from BK*,
Kinematic distributions : K*, Xsl+l-
55
Direct CP AsymmetryDirect CP Asymmetry Different decay rates for B Different decay rates for B f and B f and B f f
needneed 2 decay amplitudes2 decay amplitudes withwith different weak phase different weak phase and and different strong phasedifferent strong phase: :
( ) ( )
( ) ( )CP
N B f N B fA
N B f N B f
)cos()cos(2
)sin()sin(2
12122122
21
12122122
22
)(2
)(1
)(2
)(1
22112211
aaaa
aa
aa
aaA
eaeaaeaeaa
ff
ff
CP
iif
iif
Weak phase difference
Strong phase difference
Penguin-dominated decays like B K(*), K, K* have small ACP in SM sensitive to extra CP-violating phases due to NPDIS 2004
Mousumi Datta, University of Wisconsin-Madison
66
PEP-II Luminosity PerformanceBest Peformance
PEPII peak Luminosity : 8.305x1033 cm-2 sec-1
24 hours : 660.5 pb-1 On-peak (fb-1)
Run 1+2 82
Run 1+2+3 113
Run 4 data taking in progress:
~100 fb-1 by July 2004.
DIS 2004Mousumi Datta, University of Wisconsin-Madison
89.7106 BB82 fb-1
on-peak data for analysis
124.1106 BB
77
Standard Variables in Standard Variables in (4S) Frame(4S) Framee+e- (4S) BB B produced almost at rest in (4S) frame
For B decay with no missing particles use beam energy to constrain mass and energy of the reconstructed B
**beamB EEE
background
signal
background
0 for signal0 for signal mB for signal**beamB EEE 22
BbeamES PEm
E and mES provide uncorrelated measurement of energy and massDIS 2004Mousumi Datta, University of Wisconsin-Madison
88
Rare Hadronic B DecaysRare Hadronic B Decays Suppressed at tree(T) level due to Cabbibo, FCNC, etc. Significant Penguin (P) contribution.
Hadronic decay modes covered in the talk
Tree diagram Penguin diagram
DIS 2004Mousumi Datta, University of Wisconsin-Madison
B , K, KKB → ρρ and ρK*B K(*)/B (')K(*) and (')/B () ()
99
BB • Measure Measure effeff from time dependent CP analysis from time dependent CP analysis
of Bof B00++- - decaydecay
• Constrain using isospin connection for decays
BF(B0+-)=
(4.70.60.2)10-6
(PRL, hep-ex/0207055)
B0+-
@ 82 fb-1
60.19.0
0
10)6.05.5(
)(BF
B
(PRL, hep-ex/0303028)(PRL, hep-ex/0303028)
DIS 2004Mousumi Datta, University of Wisconsin-Madison
d
u
u
Tree CKM suppressed
Penguin diagram
B+-
Color suppressed
tree for B00
B++0 @ 82 fb-1
1010
B000 @ 113 fb-1
BF(B000) = (2.1 ± 0.6 ± 0.3)10-6
Observed events = 46 ± 13 ± 3(PRL ,hep-ex/0308012)(PRL ,hep-ex/0308012)
SM prediction BF ~ (0.3-1.1)10-6
4.2
0
0002
(
(sin
BBF
BBF
With WA Br(B00 )
|-eff |<48o at 90% c.l.
BB (Cont’) (Cont’)
Observation of significant excess of 00 events
Bound on penguin pollutionGrossman Quinn bound PRD 58
(1998) 017504
1111
Summary of BF (10-6) for K, and KKModeMode BF (10BF (10-6-6)) AAcp cp L (fbL (fb-1-1))
K+ - 17.9 0.9 0.7
-0.1070.0410.01
3
82, 113
K0 + 22.31.71.1 -0.050.080.01 82
K+ 0 -0.090.090.01 82
K0 0 11.4 1.7 0.8
0.030.360.11 82
+ - 4.7 0.6 0.2
- 82
+ 0 82
0 0 2.1 0.6 0.3
- 113
K+ K- < 0.6 @ 90% CL - 82
K+ K0 < 2.5 @ 90% CL - 82
K0 K0 < 1.8 @ 90% CL - 82
6.05.5 0.19.0
0.18.12 2.11.1
02.003.0 18.017.0
KK decays more sensitive to rescattering : No sign of rescattering (FSI) yet
Acpconsistant with zero
Ratio of BF for and K sensitive to angle
DIS 2004Mousumi Datta, University of Wisconsin-Madison
Time dep. CP analysis of Ks0 using 113 fb-1
Measure sin2
PRL
1212
((++--)/)/(K(K++--)) 0.26 0.26 ± ± 0.04 0.04 ± ± 0.020.02
(K(K++--)/)/(K(K00++)) 0.87 0.87 ± ± 0.08 0.08 ± ± 0.050.05
22(K(K++00)/)/(K(K00++)) 1.15 1.15 ± ± 0.14 0.14 ± ± 0.120.12
(K(K++--)/2)/2(K(K0000)) 0.79 0.79 ± ± 0.12 0.12 ± ± 0.060.06
Isospin ratios
<< 1/2
if tree only
Significant Penguin contribution Isospin symmetry holds well for penguin dominated modes( EW penguin small) Need more statistics for further constraint
Isospin sum rule (Gronau et. al. (2003), hep-ph/0307095) (Lipkin)
BaBar: 1.21 0.13 Belle(LP03): 1.25 0.15 New Physics ?
22
2
00
0000
||
)*Re(
||
||1
)()(
)()(2
P
PT
P
P
KBKB
KBKB EWEW
K and
< 4%
*Ratios calculated by speaker, assuming errors are uncorrelated
DIS 2004Mousumi Datta, University of Wisconsin-Madison
1313
B → ρρ, ρK* and K(*)/
2
2 2 2 21 2 1 2
1 2
1 11 sin sin cos cos
cos cos 4 L L
df f
d d
BVV: Longitudinal polarization
( fL ≡ L / )
Expect:
fL ~ 1 – O(M2V/M2
B)
Time dependent CP analysis: Sin(2) K0 and Sin(2eff) from
Search for direct CP violation.
DIS 2004Mousumi Datta, University of Wisconsin-Madison
1414
B0 + -
NS = 224 ± 29
B B → → ρρρρ and and ρρKK**
ModeMode BF (10BF (10-6-6)) Polarization Polarization ((LL//))
AACPCP
BB00++-- 30 30 4 4 5 5 --
BB++→→ρρ++ρρ00 --0.190.190.230.230.00.0
33
BB00→→ρρ00ρρ00 <2.1 <2.1 @90%CL@90%CL -- --
BB++→→ρρ00K*K*++ )(.
)(.)(sin
0
0002
0
00
BBFf
BBFf
L
LEff
| - Eff| < 13o () at 68% CL
Grossman Quinn bound PRD 58 (1998) 017504
04.003.003.099.0
8.55.22 7.5
4.5
4.26.10 0.36.2
04.097.0 03.007.0
04.096.0 04.015.0
04.020.0 32.029.0
100% Longitudinal Polarization CP even
DIS 2004Mousumi Datta, University of Wisconsin-Madison
L=82 fb-1PRL
Time dep. CP measurement for +- also updated with 113 fb-1. (preliminary)
1515
B B K K(*)(*)//
Mode BF (10-6) ACP Polarisation
K0 - -
K+ 0.040.090.01
-
+ <0.41 @ 90% CL
- -
K*0 11.21.30.8 0.040.120.02
0.650.070.02
K*+ 0.160.170.03
0.460.120.03
Expect similar BF all KK(*)(*) modes BF(+)<410-7 [90% CL](No indication for rescattering – as KK) Polarisation small
5.06.7 3.12.1
5.00.10 9.08.0
1.17.12 2.20.2
hep-ex/0309025
hep-ex/0307026 L=82 fb-1
DIS 2004Mousumi Datta, University of Wisconsin-Madison
Small fL still not understood – may be related to penguins
[Bauer, Pirjol, Rothstein, Stewart, hep-ph/0401188; Kagan]
BK*0 full angular analysis
with 113 fb-1
fL = 0.52 0.07 0.02
(preliminary)
1616
(')K(*) and (')(')//
Decays () and + are dominated by tree diagram as penguin diagrams are suppressed.
K, K*enhanced
K, K*suppressed
Interference
Flavour singlet diagram:
Also important for K*
CKM suppressed
H Lipkin Phys Lett B254 (1991) 247
Similarly for K0, K*0 except no external tree.
DIS 2004Mousumi Datta, University of Wisconsin-Madison
1717
((,,)()(K,K,,,K*,K*,,,00), ), 00, , 00
PR
L 9
1, 1
6180
1 20
03,
PR
L 9
2,0
61801 2
004
Su
bm
itte
d t
o P
RD
h
ep
-ex/0
403025
L=82 fb-1
K BF 3-10 times larger than initially expected values. In agreement with recent NLO QCD prediction (Beneke and Neubert, (2003) Nucl. Phys. B 651, 225).
Large asymmetry predicted for +, small for +
Chiang, Gronau, Luo, Rosner and Suprun [hep-ph/0307395]
DIS 2004Mousumi Datta, University of Wisconsin-Madison
K* measurement not precise enough to determine the presence of flavor singlet component.
1818
CLEO
Isoscalar (Isoscalar (,,,,,,)()(,,,,,,)) 8 of 10 combinations , , , , , , ,
(not , )
L=82 fb-1Submitted to PRL
DIS 2004Mousumi Datta, University of Wisconsin-Madison
1919
Correlated bounds on CP asymmetries in B0Ks
Gronau, Rosner &
Zupan, hep-ph/0403287, April 2004]
Predictions for Predictions for KKss Time Dependent Time Dependent
asymmetry asymmetry S,CS,C
HFAG average
DIS 2004Mousumi Datta, University of Wisconsin-Madison
From 00, 0, 0’, , ’’, ’
From 00, K+K-, 0, ’
Previous bounds
Similar bounds from [Grossman-Ligeti-Nir-Quinn, PRD 68, 015004 (2003).]
2020
Rare decays aren’t so “rare”Rare decays aren’t so “rare”
DIS 2004Mousumi Datta, University of Wisconsin-Madison
2121
BBK*K* and and //BB// :: (PRL, (PRL,
hep-ex/0306038)hep-ex/0306038)BBK*K*
(Preliminary)(Preliminary)
Iso-spin asym. 0-=
= 0.0510.044(stat) 0.023(sys) 0.024(R+/0)
SM prediction: (+5 to +10)%
)()(
)()(*0*0
*0*0
KBKB
KBKB
Time dep. CP analysis
B0 K*0(Ks0) with 113
fb-1
Prediction MeasurementBF(B0K*0(K+-,K0
s0)) 7.5 3.0 3.920.200.24 BF(B+K*+(K+0,K0
s+)) 7.5 3.0 3.870.280.26 ACP(K*(K+-, K+0, K0
s+) < 1% -0.0130.0360.010 BF(B00(+-)) 0.5 – 0.75 < 1.2BF(B++(+0)) 0.8 – 1.5 < 2.1BF(B0(+- 0)) 0.5 – 0.75 < 1.0
10-5
10-6@ 90% CL
L=
82
fb-1
L=
78 f
b-1
DIS 2004Mousumi Datta, University of Wisconsin-Madison
2222
L=82 fb-1Semi-inclusive BSemi-inclusive BXXss
Acp = 0.0250.050.015 (for total sample)
Acp = -0.040.100.02 (for high purity sample)
Submitted to PRL
Xs fully reconstructed
in 12 exclusive
self-tagging modes
DIS 2004Mousumi Datta, University of Wisconsin-Madison
2323
BBKK(*)(*) ll++ll--
SM Prediction (10-6)BF(B → Kl+l-) = 0.350.12 BF(B → K*e+e-) = 1.580.49BF(B K*+-) = 1.190.39
Ali et al. (hep-ph/0112300, 2001)BK*l+l-
BKl+l-
614.013.0 1004.065.0
lKlBBF
633.029.0
* 1010.088.0
llKBBF
L=113.1 fb-1
3.3
>8
PRL, hep-ex/0308042PRL, hep-ex/0308042
,,
,,
,
,,
0
0*0*
0*0*
00
elK
KKKK
llKBllKB
llKBllKB
s
s
s
DIS 2004Mousumi Datta, University of Wisconsin-Madison
2424
L=82 fb-1
Semi-inclusive BSemi-inclusive BXXssll++ll- -
Less theoretical uncertainty Observables: BF, m(l+l-), m(Xs), AFB(m(l+l-))
68.15.1 10))()(6.13.6(
)(
syststat
llXBBF s
• Xs reconstructed in 10 modes: uncounted states ~25% of the total rate
• In signal region m(l+l-)> 0.2 GeV/c2 4110(stat)2(syst) events observed
Prediction for m(l+l-)>0.2 GeV/c2: (4.20.7)10-6 (Ali, hep-ph/0210183, 2002)
DIS 2004Mousumi Datta, University of Wisconsin-Madison
Xse+e- Xs+-
Xsl+l- Xse
2525
BBKK FCNC transition 2 ’s in the final state Reconstruct one B & look for signal in the recoil side
B- K-simulation
Data
80.7 fb-1 BF < 1.05 x10-4
@ 90% CL
Hadronic B SampleHadronic B Sample Semileptonic B SampleSemileptonic B Sample
Combined limit @ 90% CL < 7.0 x 10Combined limit @ 90% CL < 7.0 x 10-5-5
50.7 fb-1
BF < 9.4 x10-5 @ 90% CL
SM Expectation: ~ 410-6
DIS 2004Mousumi Datta, University of Wisconsin-Madison
2626
B++ at
81.4 fb-1
B++ simulation
DataData
BF(B++) < 6.610-6 @ 90% CL
(PRL)
• Purely leptonic decay are Purely leptonic decay are helicity suppressed in SMhelicity suppressed in SM
• B+l+ : SM expectation:
BF(B++) ~ 410-7
BF(B++) ~ 910-5
• Provide measurement of fB|Vub|
• Sensitive to charged Higgs, leptoquarks.
BB++ll++
L=81.4 fb-1
DIS 2004Mousumi Datta, University of Wisconsin-Madison
2727
BB• Multiple ’s in the final state Reconstruct one B & look for signal in the recoil side.
Combined limit
BF < 4.1 x 10-4 at 90% CL
Semileptonic B SampleIncludes e,
total ~ 0.07 %BF < 4.9 x10-4 @ 90% CL
L=81.9 fb-1
Hadronic B Sample Includes e, , , 0, 3
total ~ 0.028 %BF < 7.7 x10-4 @ 90% CL
Existing tightest limit (L3) Existing tightest limit (L3)
BF < 5.7 x 10BF < 5.7 x 10-4-4 at 90% CL at 90% CL
Eextra (GeV)
Semileptonic SampleSemileptonic Sample
DIS 2004Mousumi Datta, University of Wisconsin-Madison
2828
SummarySummary Large amount B mesons produced at B-factories
First observation of many rare decay modes More precise measurement of BFs Tighter upper limits on BFs
BaBar haven’t seen evidence of direct CP violation yet. Precise measurements of ACP in future will enable further tests of models.
No strong evidence of NP. Measurements and search for many more rare
decay modes continuing The expected increase in luminosity of the B
Factories promises a continuing, rich harvest of physics
DIS 2004Mousumi Datta, University of Wisconsin-Madison
Stay tuned for the summer results.
2929
Backup Slides Backup Slides
3030
PEP-II Asymmetric B-Factory at SLACPEP-II Asymmetric B-Factory at SLAC
Asymmetric collider operation at (4S) resonance (Ecms=10.58 GeV)
3.1 GeV e+ and 9 GeV e-
B-mesons in lab have =0.56
(4 )e e S BB
B B production threshold
DIS 2004Mousumi Datta, University of Wisconsin-Madison
3131
The BaBar DetectorThe BaBar Detector
DIRC PID)144 quartz bars
11000 PMs
1.5 T solenoid EMC
6580 CsI(Tl) crystals
Drift Chamber40 stereo layers
Instrumented Flux Return
iron / RPCs (muon / neutral hadrons)
Silicon Vertex Tracker5 layers, double sided
strips
e+ (3.1 GeV)e- (9 GeV)
SVT: 97% efficiency, 15 mm z hit resolution (inner layers, perp. tracks)SVT+DCH: (pT)/pT = 0.13 % pT + 0.45 % DIRC: K- separation 4.2 @ 3.0 GeV/c 2.5 @ 4.0 GeV/c EMC: E/E = 2.3 %E-1/4 1.9 %DIS 2004
Mousumi Datta, University of Wisconsin-Madison
3232
Continuum SuppressionContinuum Suppression
B Signal
u,d,s,cbackground
Fisher Discriminant
Arb
itrar
y U
nits
e+ e-e+ e-
Signal B
Other B
B decays: isotropic
Examples of topological variables using these properties: Thrust
Energy cones
Continuum (u,d,s,c): jet-like
2
,20 cos, iTROEi
iROEi
i BpLpL
Variables are used in a Fisher or a Neural Net (NN)DIS 2004Mousumi Datta, University of Wisconsin-Madison
3333
BF & ABF & ACPCP for B for B , , K, K, , , KK
Mode BF (10-6) ACP L (fb-1)
BB00 → → ρρ ππ 22.61.82.2 -0.110.060.0
3
82 (PRL), 113
BB00 → → ρρ- - KK++ 0.180.120.08
82 (PRL)
BB00 → → ρρ0 0 ππ00 < 2.9 @ 90% CL - 82 (PRL)
BB++ → → ρρ+ + ππ00 10.91.91.9 0.240.160.06
82 (PRL)
BB++ → → ρρ0 0 ππ++ 9.51.10.9 -0.190.110.0
2
82 (PRL)
BB++ → → ρρ00 K K++ <6.2 @ 90% CL - 56.4 (PRL)
BB00 → → ωω KK00 - 82 (PRL)
BB++ → → ωω KK++ 4.8 0.8 0.4 -0.090.170.0
1
82 (PRL)
BB00 → → ωω ππ00 < 1.2 @ 90% CL - 82 (PRD)
BB++ → → ωω ππ++ 5.50.90.5 0.030.160.01
82 (PRL)
3.13.7 3.12.1
5.09.5 6.13.1
Measure eff from time dependent
CP analysis of
BF of and K are in good agreement with theoretical expectation.
DIS 2004Mousumi Datta, University of Wisconsin-Madison
3434
BB K*K*00 full angular analysisfull angular analysis
Direct rate asymmetries Triple-product asymmetries
Fit results
DIS 2004Mousumi Datta, University of Wisconsin-Madison
L=113 fb-1Preliminar
y
3535
BB K*K*00
No evidencefor Direct CP violation
B
f L=
0.52
0.07
0.0
2
Weak evidence for FSI (2.3
Triple-productasym. (1.7(would beevidence forNew PhysicsDatta&London hep-ph/0303159)
DIS 2004Mousumi Datta, University of Wisconsin-Madison
3636
BABAR94±14(stat)±6(syst) evtsL=111fb-1
TotalContinuumAll bgk.
BABAR TotalContinuum
All bgk.
B0f0(980)Ks , f0+-First Observation
• Structure of this scalar meson obscure. Recent studies favor usual qq states [hep-ph/0011191(2000)]
648
2/)(sincos0
s
ss dduussf
Decay can be dominated by bsss penguin
• ss sizeable• buus tree doubly Cabbibo suppressed compared to leading penguin
• Time dependent CP measurement(see L. Ligioi’s talk)
BF(B0f0(980)(+-)K0) =
(6.0 0.9 0.4 1.2)10-6
DIS 2004Mousumi Datta, University of Wisconsin-Madison
L=111 fb-1
Preliminar
y
3737
BB a a00(980)((980)(K,K,,,KKSS))Dominant tree diagram G-parity suppressed
Dominant penguin
a0K
a0
aa00++
negligible compared with anegligible compared with a00-- (G-parity) (G-parity) “self-tagging” “self-tagging”
aa00KK expected to be small (Wilson-coefficient cancellation) expected to be small (Wilson-coefficient cancellation)
Chernyak, PLB 509, 273 (2001).Chernyak, PLB 509, 273 (2001).
3838
BB a a00(980)((980)(K,K,,,KKSS) ) PRELIMINARY
Unbinned ML fits (89M BB events); aUnbinned ML fits (89M BB events); a0 0 , , ,3,3 Only previous search from BABAR (20 fbOnly previous search from BABAR (20 fb-1-1, LepPho 2001), LepPho 2001)
Found 3.7Found 3.7 evidence for evidence for BB 00 a a00(980)(980)--++
Do not confirm that with substantially improved sensitivityDo not confirm that with substantially improved sensitivity• Studies indicate the previous result was a statistical fluctuationStudies indicate the previous result was a statistical fluctuation
B is B(B a0X)B(a0
L=82 fb-1
3939
BB KKS S branching fractionbranching fraction
B(BB(B KK00 ++--) = (43.8 ) = (43.8 ± ± 3.8 3.8 ±± 3.4) 3.4)1010-6-6
Comparable to, but more precise than, previous resultsComparable to, but more precise than, previous results• CLEO (50CLEO (50 ± ± 10 10 ±± 7) 7)1010-6-6
• Belle (45.4 Belle (45.4 ± ± 5.2 5.2 ±± 5.9) 5.9)1010-6-6
Measurement of the branching Measurement of the branching fraction integrated over the fraction integrated over the Dalitz plotDalitz plot
Careful corrections for Careful corrections for efficiency across Dalitz plotefficiency across Dalitz plot
Consistency check fromConsistency check from
BB00 D D--++ with D with D-- KKSS--
L=82 fb-1
4040
BB00→K→K++KK--KKSS and B and B++→K→K++KKSSKKSS
3 body decay 3 body decay BB00→K→K++KK--KKSS (excluding (excluding BB00→→KK00))
Time dependent CP analysis: Sin(2) Determine Determine CP-CP-even fraction using even fraction using
Branching fraction measurements Branching fraction measurements Isospin symmetry Isospin symmetry [Belle Collaboration, [Belle Collaboration,
Phys. Rev DPhys. Rev D6969, 012001 (2004)]:, 012001 (2004)]:
)(
)(200
00
KKKB
KKKBf SS
even
B0→K+K-KS
201±16 events
L=111 fb-1
B+→K+KSKS
122±14 events
BABAR
DIS 2004Mousumi Datta, University of Wisconsin-Madison
BF(BF(BB00→K→K++KK--KK00)= )= (23.8(23.8±2.0±1.6±2.0±1.6))×10×10-6-6
BF(BF(BB++→K→K++KKSSKKSS)=(10.7)=(10.7±1.2±1.0±1.2±1.0))××1010-6-6
ƒƒeveneven=0.98=0.98±0.15±0.04±0.15±0.04
Acp(BAcp(B++KK++KKssKKss) = -0.042 ) = -0.042
0.114(stat) 0.114(stat) 0.02(syst) 0.02(syst)
L=113 fb-1
4141
B+→K+K-K+
B+→K+ -+
B+ + - +
BF (10BF (10-6-6)) AACPCP
++ -- ++ 10.9 10.9 3.3 3.3 1.6 1.6 -0.39 -0.39 0.330.33 0.12 0.12
KK++ -- ++ 59.1 59.1 3.8 3.8 3.2 3.2 0.01 0.01 0.07 0.07 0.03 0.03
KK++ K K-- K K++ 29.6 29.6 2.1 2.1 1.6 1.6 0.02 0.02 0.07 0.07 0.03 0.03
KK++ K K-- ++ < 6.3 @ 90% CL< 6.3 @ 90% CL N/AN/A
++ K K-- ++ < 1.8 @ 90% CL< 1.8 @ 90% CL N/AN/A
KK++ -- K K++ < 1.3 @ 90% CL< 1.3 @ 90% CL N/AN/A
Charmless BCharmless B++hh++hh--hh+ + (h=K, (h=K,))• Search for direct CPV. Measure through the interference between various
charmless decays and c0 resonance (Blanco
et al, Phys.Rev.Lett.86,2720(2001))
• Measurement of B+++- can be used to reduce uncertainty in
measurement (Snyder and Quinn, Phys. Rev. D48,
2139(1993))
L=81.8 fb-1
PRL (hep-ex/0304006)PRL (hep-ex/0304006)
DIS 2004Mousumi Datta, University of Wisconsin-Madison
4242
Exclusive Branching Fractions of BExclusive Branching Fractions of B++KK++- - + +
BF (10BF (10-6-6))
BB++ KK*0*0(892)(892)++, K, K*0*0 KK++ --
BB++ ff00(980)K(980)K++, f, f0 0 ++--
BB++ c0c0 K K++, , c0c0 ++-- 1.51.50.40.40.10.1
BB++ DD00++, D, D00 KK++ -- 184.6184.63.23.29.79.7
BB++ higher Khigher K*0*0++, K, K*0*0 KK++ --
BB++ 00(770)K(770)K++, , 00 ++-- <6.2 at 90% CL<6.2 at 90% CL
BB++ KK++ - - ++ (non resonant) (non resonant) <17 at 90% CL<17 at 90% CL
BB++ AAhigher fhigher f@@ K K++, f , f ++-- <12 at 90% CL<12 at 90% CL
5.10.48.15.15
L=56.4 fb-1j
c0
f0(980)
0
higher K*0
D0
K*0(892)
(veto)J/
(2S)
1.26.22.12.9
9.49.20.21.25 4.95.0
Search for direct CPV Measure through the interference between various charmless decays and c0 resonance
Submitted to Phys.Rev.Lett. (hep-ex/0308065)Submitted to Phys.Rev.Lett. (hep-ex/0308065)
Dalitz plot divided into 8 regions
• K*0(892)+ BF result significantly higher than prediction from many factorization models.• Limit on non-resonant component dependent interference will be hard to measure
DIS 2004Mousumi Datta, University of Wisconsin-Madison
4343
Inclusive bInclusive bss L=54.6 fb-1
Signalregion
Onpeakdata
Backgroundexpectation
Signal Region2.1 < E*
< 2.7 GeV
443.0
23.0 10)](mod.)(37.0)(36.088.3[
elsyststat
XBBF s
DIS 2004Mousumi Datta, University of Wisconsin-Madison
4444
BB00ll++ll--
FCNC processFCNC process
B0l+l- : SM Expectation:
BF(B0e+e- ) : 1.910-15 BF(B0+-) : 8.010-11
In various SUSY models BF enhanced, B0e allowed.BB00ee++ee-- BB00++-- BB00ee
BF(BBF(B00ee)<2.1)<2.11010-7-7BF(BBF(B00ee++ee--) < 3.3) < 3.31010-7-7
Upper limits at 90% CL:
BF(BBF(B00++--)< 2.0)< 2.01010-7-7
L=54.4 fb-1
DIS 2004Mousumi Datta, University of Wisconsin-Madison
4545
Fully reconstructed B Meson in Hadronic decays: D(*)(n) Semileptonic decays:
D(*)l (statistically independent)
Look for process of interest in the Recoil
Pro: Background suppression!
Con: Statistics limited
‘other’ B
Brecoil
BrecoD* Y(4S) l
For search of rare decays like BK, B ....
RecoilRecoil Analysis Analysis
sidebandsideband peakpeak
Hadronic BHadronic B Sample Sample
N N BBBB = (1.67 = (1.670.09)0.09)10105 5 @ 81.9 fb@ 81.9 fb--
11DIS 2004Mousumi Datta, University of Wisconsin-Madison