Download - Results from Belle and BaBar
P. Chang P. Chang HCP2005, 7 July HCP2005, 7 July B Factory ResultsB Factory Results
Results from Belle and BaBarResults from Belle and BaBar
Paoti ChangPaoti ChangNational Taiwan UniversityNational Taiwan University
Hadron Collider Physics Hadron Collider Physics Symposium 2005Symposium 2005
4-9 July 2005, Les Diablerets, Switzerland4-9 July 2005, Les Diablerets, Switzerland
HCP2005, 7 July
P. Chang B Factory Results
CP Violation and CKM Matrix
CPV in SM arises from an irreducible
complex phase.
Is there only one weak phase?
B meson properties
2
– Establish CPV in 2001 by Belle and BaBar
– Precise measurement of SM parameters
– Search for TCPV in other processes
– Direct CP violation and rare decay
HCP2005, 7 July
P. Chang B Factory Results
Asymmetric e eCollider
3
e+
(4S)
+
-
KS
J/B1
B2
+-
K+
-0
D
B0_
B0
t z c
z ~ 200m
fCP
Flavor tag
e
Piermaria Oddone
HCP2005, 7 July
P. Chang B Factory Results
B Factory Performance
Belle: Peak luminosity= 1.58 1034 cm s; ~ 1 fb/day
Unexpected
Shut down
BaBar: Peak luminosity~ 1 1034 cm-2 s-1
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HCP2005, 7 July
P. Chang B Factory Results
BaBar Detector
Cherenkov Detector (DIRC)[144 quartz bars, 11000 PMTs]
Silicon Vertex Tracker (SVT)[5 layers]
Instrumented Flux Return (IFR) [Iron interleaved with RPCs].
CsI(Tl) Calorimeter (EMC)[6580 crystals].
Superconducting Coil (1.5T)
Drift Chamber [40 stereo lyrs](DCH)
e- (9 GeV)
e+ (3 GeV)
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HCP2005, 7 July
P. Chang B Factory Results
Belle Detector
/ KL detection 14/15 lyr. RPC+Fe
CsI(Tl) 16X0
Aerogel Cherenkov cnt. n=1.015~1.030
Si vtx. det. 3/4 lyr. DSSD
TOF counter
SC solenoid1.5T
8GeV e
3.5GeV e
EFC
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HCP2005, 7 July
P. Chang B Factory Results
Results Measurements on the unitarity triangle
– sin(2from b ccs
– sin(2eff from b sss
– and Rare Decays and Direct CP Violation – B → – Radiative B decays – Hadronic B decays See Abe and Forti’s talks @LP05 for Vub measureme
nts
and other results. 7
HCP2005, 7 July
P. Chang B Factory Results
Mixing Induced CP Violation
Asymmetry occurs due to the interference
between B0 → f and B0 → f.
Theoretically clean measurement
from J/S and other b →ccs decays.
Sf = sin2for JKS
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HCP2005, 7 July
P. Chang B Factory Results
sin2/sin2 from B → J/ K0
034.0021.0
047.0668.0
A
S039.0049.0
069.0619.0
A
S
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Nsig =5264 73 Nsig =4792 105
HCP2005, 7 July
P. Chang B Factory Results
sin2 sin Continue
New W.A. 0.687 0.032
• HFAG Winter 2005 average:
• Belle summer update (386 M BB pairs):
• HFAG New average (preliminary)
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HCP2005, 7 July
P. Chang B Factory Results
Four-fold Ambiguity of 1
– sign ambiguity from the two choices of strong phases.
– BaBar resolves the ambiguity by examining the S wave and
p wave interference near K*0 (89 M BB).
– Belle assumes s-quark helicity conservation.
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HCP2005, 7 July
P. Chang B Factory Results
Belle Extraction from B →D0h
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HCP2005, 7 July
P. Chang B Factory Results
f(m,m) Determination
Using inclusive D*→D0
– Distinguish D from the sign
of slow
– Express f in sum of resonances
(18) and non-resonant amplitudes
– Perform unbinned likelihood fit
2 2
D0 → KS
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HCP2005, 7 July
P. Chang B Factory Results
Time dependent Dalitz Analysis
Perform fit using 309 ± 31 events with 63% purity D(157 ± 24),D(67 ±10), D (58 ± 13), D*/D*
(27±11)
More K*+
Than K*
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Belle Preliminary
HCP2005, 7 July
P. Chang B Factory Results
Dream of New Physics with CPV in Rare Decays
In the SM for the pure bs transition,
sin(2 1)eff (bsss) ≈ sin(2 1)(bccs)
Any large deviation may mean new physics. Decay Modes: B KS ;
B KS ;
B KKKS;KsKsKs
B f0 KS, KS, KS
Theoretically deviation
between the two processes
can be as low as ~ 5%.
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HCP2005, 7 July
P. Chang B Factory Results
Results in last summer
sin21(bsqq) = 0.39 0.11 (Belle) 0.42 0.10 (BABAR)
CL = 1.2 104 (3.8)
World Average (WA)
sin21(bsqq)= 0.41 0.07 sin21(bccs) = 0.726 0.037
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HCP2005, 7 July
P. Chang B Factory Results
KS , KL and KKKS Signals
New
114±12
98± 18
399±28
17
180 16
78 13
536 29
HCP2005, 7 July
P. Chang B Factory Results
Fit Results of KS , KL and KKKS
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HCP2005, 7 July
P. Chang B Factory Results
BaBar Measurement on KSKSKS
• Allow at most one KS →
• Find ZCP from the interception of three Ks tracks with IP constrained fit.
• Z resolution is dominated by tagged side vertex.
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00 0
Nsig= 88 10
HCP2005, 7 July
P. Chang B Factory Results
Belle Measurements on KS and KL
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Nsig =830 35 Nsig =187 18
BelleK0 :
“sin2”= 0.62 0.12 0.04C = 0.04 0.08 0.06
BaBarK0 :
“sin2”= 0.30 0.14 0.02C = 0.21 0.10 0.02
HCP2005, 7 July
P. Chang B Factory Results
B0f0KS
Measurements on KS, KS and f0KS
08.018.011.0
08.047.022.0
A
S13.039.019.0
53.095.0 12.015.0
A
S13.023.023.0
08.036.047.0
A
S
B0KSB0KS0
Belle update, 386 M BB pairs
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Nsig = 344 ± 30
Nsig = 68 ± 13 Nsig = 145 ± 16
HCP2005, 7 July
P. Chang B Factory Results
Summary of b → s penguin results
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Need super B factory to provide enough statistics.
2.6deviation
HCP2005, 7 July
P. Chang B Factory Results
extraction in B →
0
sin(2 )hh
hh
C
S
2eff
sin( )
1 sin(2 )
hh
hh hh
P T
C
S C
measure eff
need to bound |eff-| (shift from loops) different |Penguin/Tree| for different decays
:tdV
* :tdV
:ubV
+Loops (penguins)
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HCP2005, 7 July
P. Chang B Factory Results
Isospin analysis
2| eff
|
Pure tree
A = A(B→h h)
A+0 = A(B→h+ h0) A00 = A(B→h0h0)
Gronau and London
h: or Why is better?
Br(B0 →00) is sizeable. not enough for A00 and Ã00
too large to set limit on
1. Br() is large. 2. almost fully long. polarized3. small non-resonant contr. 4. Br() is small.
The best way to extract() 2
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HCP2005, 7 July
P. Chang B Factory Results
CPV on B0 →
hep-ex/050349, accepted by PRLBBM 232
B0 tags
B0 tags
Asymmetry
LP2005 Paper-180BB
M 275
B0 tags B0 tags
Poor tags Good tags
AsymmetryAsymmetry
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HCP2005, 7 July
P. Chang B Factory Results
Isospin analysis for B→BABAR BELLE
fL
S,L
C,L
B
B
B__
67.54.5 10)8.55.22(
029.0033.0031.0039.0951.0
021.0029.0014.0978.0
08.014.024.033.0
08.042.009.0
09.018.003.0 09.010.030.000.0
68.37.6 10)1.77.31(
610)5430( 68.31.4 10)2.24.24(
6101.1
New
Use the averages of Belle and BaBar and the upper limit from BaBar (eff11O).
= 96o ± 13o
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HCP2005, 7 July
P. Chang B Factory Results
)(96]CKM[ 1112-
Combine and
)(99]all[ 129-
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HCP2005, 7 July
P. Chang B Factory Results
Extraction in DK Dalitz
color favored color suppressed
Select D0 → KS
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2 2 2 2, ,if m m re f m m
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2 2 2 2, ,if m m re f m m
BB[K[KSS]]DDKK
BB[K[KSS]]DDKK
m=m(KS)m=m(KS)
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HCP2005, 7 July
P. Chang B Factory Results
Distributions of Dalitz Plots
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HCP2005, 7 July
P. Chang B Factory Results
Results of Dalitz Analysis
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HCP2005, 7 July
P. Chang B Factory Results
All constraints
Putting it together Angles only
No angles
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HCP2005, 7 July
P. Chang B Factory Results
Search for B→
CKM fit predicts Br(B→) = (8.1 2.5) x10
Strategy:
1. Use hadronic tag or semi-leptonic tag2. 1 or 3 prong topology
3. Check EEcl for the remaining event.
C.L.%[email protected] 4 C.L.%[email protected] 4)Β( B
BBM 232 BB
M 275
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HCP2005, 7 July
P. Chang B Factory Results
B→K(*) l+l, K
Clean probe for EW scale physics. K measurements:
same analysis method as
in analysis.
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610BF BBM 89 BB
M 275
)Β( KB
100
36)Β( B
New
Belle LP05
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HCP2005, 7 July
P. Chang B Factory Results
B→K(*) l+l
BaBar 227 M (NEW) Belle 275 M
Br(Kll) = 0.34 0.07 ± 0.03
Br(K*ll) = 0.78 0.12Br(Kll) = 0.550 ± 0.027
Br(K*ll) = 1.65 0.23 0.100.190.17
0.0750.070
Probing new physics on AFB of K*ll.
Stay tuned for EPS
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HCP2005, 7 July
P. Chang B Factory Results
Search for →
SM prediction Br(B →) ~ 3 x10
Previous measurement: BaBar with 19.7 fbBr < 1.7 x 10
Belle new measurements
with 110 M BB:
Belle: Br <5.4 x 10 @ 90 C.L.
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HCP2005, 7 July
P. Chang B Factory Results
CPV in B → KS *
LK
mixing
*RK
Helicity Flip Suppressed by ms/mb
0B
0B
2.00.19.0)(05.040.021.0)(
00
0*
SKSKS
BBM 232 LP Paper-97
*0
*0
0.01 0.52( ) 0.11( )
0.11 0.33( ) 0.09( )
K
K
S stat syst
A stat syst
0
0
0.08 0.41( ) 0.10( )
0.12 0.27( ) 0.10( )S
S
K
K
S stat syst
A stat syst
386 M Belle-conf-0569
Time dependent CPV is suppressed due to the correlation of photon helicity.
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HCP2005, 7 July
P. Chang B Factory ResultsBB
M 211 hep-ex/0408034
2.1/
0.1
4.0
8.1
)BF(10Channel
0
-6
Search for b → d
1. Exclusive reconstruction
2. Simultaneous fit assuming
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HCP2005, 7 July
P. Chang B Factory Results
Observation of b → d penguin
LP PAPER-155
5.5
2.6
5.1
1.5
)( Sign.
34.1/
58.0
17.1
55.0
)BF(10Channel
14.034.010.031.0
07.035.011.027.0
09.035.008.031.0
0
12.043.011.037.0
-6
BBM 386
0.143 < |Vtd/ Vts| <0.26038
HCP2005, 7 July
P. Chang B Factory Results
Another Evidence for b →d penguin
BaBar 227 M Belle 275 M
KSK+
KS KS
BaBar (10) Belle(10-6) B→KK
B→KK
B→KK
<0.6 <0.37 1.0 0.4
0.10.8 0.3 0.1
1.45 0.11
1.19 0.13
Preliminary
Preliminary
0.53 0.46
0.350.40
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HCP2005, 7 July
P. Chang B Factory Results
Confirm Direct CP Violation
ACP(K+) = -0.133 0.030 0.009
ACP(K+) = -0.113 0.022 0.008
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HCP2005, 7 July
P. Chang B Factory Results
Summary of Direct CPV in B→pp
WA ACP (K+
WA ACP (K+ ) ~ 3.9 deviation, why?
ACP sum rule (Gronau and Rosner): (K0) -1/2 (K+) + (K+0) = Ọ()
0.077 0.070 = Ọ(2 ) Iain Stewart
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HCP2005, 7 July
P. Chang B Factory Results
New Resonance in e+e→ISRJ/
m = 4260 8 MeV = 88 23 MeV Include (2S) for
cross check
Missing mass distribution
consistent with
211 fb
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HCP2005, 7 July
P. Chang B Factory Results
Summary
Precision measurements becomes a reality.
Deviation of “sin2” from b→s penguin is not settled.
Rare decays: sensitive to new physics
calibration1
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– sin21 /sin2 = 0.6870.032 from b → ccs– 2/= (99 )o from , and. dominates.– D(*)K(*) Dailtz analysis. The best way to extract
12o <3/ < 137o (BaBar), 22o < < 113o (Belle)
Central values move closer; propose super B factory.
Observe b→d penguin; confirm Direct CPV; many fine measurements.
More results will be shown in EPS!
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HCP2005, 7 July
P. Chang B Factory Results
Backup
HCP2005, 7 July
P. Chang B Factory Results
Current CPV results of B→
Belle 275M
BABAR 227M
~2.3 difference between Belle and BABAR
HCP2005, 7 July
P. Chang B Factory Results