Transcript BaBar summer hot topics - University of California, San Diego

BaBar summer success
Riccardo Faccini
Universita’ “La Sapienza” and INFN Rome
BaBar Collaboration Meeting
SLAC Sep 12th 2006
Overall contribution to ICHEP
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114 Contributed papers
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cfr 69 in 2005 and 72 in 2004
70 submitted to journal
Full listing (ordered by topic) in
Belle
contributed
only 28 papers
http://www.slac.stanford.edu/BFROOT/www/Physics/Planning2006/ICHEP/ICHEP_pap.html
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Two plenary talks
24 parallel talks in 6 different sessions
All updates are on 345 fb-1 (315 onpeak)
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Up to June 1st
Publication History
Since Sep 1 2005:
BaBar: 70
Belle 28
Talks Content:
a comparison
BaBar
F P W
Measurements of R=sigma_had/sigma_mumu
1
2
measurement of form factors
2
3
Probing strong interactions with the BaBar experiment
1
3
4
2
3
Study of recently observed mesonic Charm states and
possible observation of new states
2
2
1
Observation of new baryonic Charm states
3
2
2
Quarkonium spectroscopy with the BaBar experiment
Legenda:
F: new on full stat
P: new on partial stat
W: already presented
in winter ‘06
Study of Charmed Baryons with the BaBar experiment
2
2
3
Study of B decays to Open Charm final states
2
Study of the decays of Charm mesons
1
-
2
4
2
2
2
7
5
Study of multi-body Charmless B decays
1
2
4
2
3
2
b-->c lnu decays and measurement of Vcb
3
1
b-->ulnu decays and measurement of Vub
3
2
2
1
3
3
1
2
-
3
0
2
3
Measurements of the CP angle alpha
4
0
3
2
Measurements of the CP angle gamma
1
1
7
0
Study of exclusive rad and ew penguin B decays
1
2
1
1
1
-
1
3
1
0
-
1
2
Measurement of the angle beta in Charmless B decays
7
0
6
7
Measurements of CP violation in B-->Charm decays
2
3
2
1
3
Search for leptonic B decays
3
2
Measurements of Charmless hadronic BFs
total
3
1
1
5
Search for physics BSM in tau decays and production
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Study of two-body Charmless B decays
Search for mixing and CP violation in D decays
Note: both collaborations
presented all results new
since last round on
summer conferences
-
4
Loose ends on heavy quark physics
Shape function from radiative B decays
Same set of results on the
very last chunk of data, but
otherwise BaBar has >2
times more results
Belle
F P W
1
2
1
0
3
1
2
3
31
40
66
33
19
16
Reader Digest of results
Semileptonic B:
10 papers
Radiative B decays:
10 papers
CP Violation, a:
5 papers
Charmless
Hadronic B:
19 papers
Charm(onium)
prod and decay
13 papers
B to charm decays:
12 papers
Tau and low-energy:
8 papers
Charm(onium)
spectroscopy:
16 papers
CP Violation g:
8 papers
CP Violation, b:
14 papers
Courtesy of D. Lange
CP violation in B decays
Semileptonic B:
10 papers
Radiative B decays:
10 papers
CP Violation, a:
5 papers
Charmless
Hadronic B:
19 papers
Charm(onium)
prod and decay
13 papers
B to charm decays:
12 papers
Tau and low-energy:
8 papers
Charm(onium)
spectroscopy:
16 papers
CP Violation g:
8 papers
CP Violation, b:
14 papers
Reviewed in http://ichep06.jinr.ru/reports/2_hazumi_ichep2006.ppt and 3_10p20_Kowalewski.pdf
CP violation in Charmonium
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Repeated standard set of measurements
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2.5 s direct CP violation in CP=-1 modes
sin2b=0.710±0.034±0.0019
(was 0.722±0.040)
(Belle: 0.642±0.031±0.017)
l=0.932±0.026±0.017
(when floated on CP=-1 states)
Belle has only updated J/YK0,
still without publication
Combination with Belle
Measurements are consistent [2.1 s in the case of CCP] and the averages
consistent with the SM. Still to work to make the samples uniform (J/Y K0 vs all
modes)
bs penguins
Larger BaBar errors because
of full Dalitz (see next slide)
4.9s from S=0
Naïve average of all b g s modes
sin2beff = 0.52 ± 0.05
2.6 s deviation between
penguin and tree
(b g s)
(b g c)
New result not yet in averages
(more work needed)
BaBar still exploits its luminosity
significantly better than Belle
BaBar: 347M BB
Belle : 535M BB
BK+K-K0
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75% of BKKK0 is not BfKs
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Important to understand the underlying background and its
interference
Full Dalitz analysis performed (with f,f0, and non
resonant component)
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First ambiguity free
measurement of b in bs
penguins
Knowledge of strong phase allows to extract weak phases
without ambiguities
Assuming SM (i.e. same weak phase for all final
states)
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b=0.38±0.08 rad [SM=0.35]  very good agreement with SM
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ambiguity on b resolved at the 4s level (SM favored)
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Twice more sensitive that Belle in BDh0
First TD analysis
in bd penguins
BKsKs
N ( K 0S K 0S )  32 87 (7.5s )
S ( K 0S K 0S )  1.4 00..87
27
( B 0  K 0 K 0 )  (1.02 00..24
) 10 6
40
C ( K 0S K 0S )  0.39 00..39
Old Result:
N ( K S0 K S0 )  23.0 76..77
1.9
 2.0
(4.5s )
40
( B 0  K 0 K 0 )  (1.19 00..35
 0.13) 10 6
Measurement of a
No news from Belle
The error on a from rr is dominated by the limit
on r0r0
First evidence of Br0r0
Nr0r0 = 98+32
−31 ± 22
B0gr0r0
Significance 3.0s
 = [1.2 ± 0.4 (stat.) ± 0.3 (syst.)]x10-6
fL= 0.86+0.11-0.13 (stat.) ± 0.06 (syst.)
Error on a from 11o to 14o
Previous BaBar result: (0.5±0.4) 10-6
Belle never presented a result
r0 r0
r0f0
Highly improved sensitivity
Update on 2-body
B0 tags
N00 = 140 ± 25
00
_
B0 tags
asymmetry
S = −0.53 ± 0.14 ± 0.02
Br00 = (1.48 ± 0.26 ± 0.12)  10−6
C = −0.16 ± 0.11 ± 0.03
C00 = −0.33 ± 0.36 ± 0.08
3.6s evidence of CPV
Comparison with Belle’s 
(C = A)
2.3s diff. btw.
Belle and
BaBar
Interpreting B, Brr, and
Br results in terms of a
169.7°
CKM fit
no a in fit
a  [164, 176]º at 68.3% C.L.
Measurement
of g
BD*K
BDK
Update of
BD0K [Dalitz]
B+
B+
B-
B-
DK(old)
DK(new)
D*K(old)
D*K(new)
x-
0.08±0.07±0.03
0.041±0.059±0.018
-0.13±0.09±0.03
-0.106±0.091±0.020
y-
0.06±0.09±0.04
0.056±0.071±0.007
-0.14±0.11±0.02
-0.019±0.096±0.022
X+
-0.13±0.09±0.03
-0.072±0.056±0.014
0.14±0.09±0.03
0.084±0.088±0.015
Y+
0.02±0.08±0.02
-0.033±0.066±0.007
0.01±0.12±0.04
0.096±0.111±0.032
Errors shrink (in particular systematics), but rB is smaller (x,y closer to 0)
 error on g increases …
No update from Belle
g = 92 +/- 41 +/-10 +/- 16
(was 70+/-31+12-10+14-11 )
Other B decays
Semileptonic
and leptonic B:
12 papers
Radiative B decays:
10 papers
CP Violation, a:
5 papers
Charmless
Hadronic B:
19 papers
Charm(onium)
prod and decay
13 papers
B to charm decays:
12 papers
Tau and low-energy:
8 papers
Charm(onium)
spectroscopy:
16 papers
CP Violation g:
8 papers
CP Violation, b:
14 papers
Reviewed in http://ichep06.jinr.ru/reports/5_12p10_Barlow.ppt and 3_10p20_Kowalewski.pdf
buln exclusive: probing theory
Old technique, 80 fb-1
New “loose cuts method”
4 more results on Vub and 2 on Vcb
Brg
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No update from Belle
We have our own observation of all modes (as opposed to only r0g)
Central values in between ours past ones and Belle
BaBar ’06 315 fb-1
Btn: a year of emotions
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April: Belle announces at FPCP a >4s
evidence for Btn
May-July: BaBar struggles to
reproduce the accuracy of Belle (in an
area where we were traditionally more
advanced)
August:
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BaBar presents only one of the two
independent analyses while still
investigating
Belle presents an errata of the
efficiencies by a factor 2!!!!
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Significance down to 3.5s, BF a factor 2
larger
BaBar and Belle have similar accuracies
Soon: BaBar is ready to publish both
analyses  expect an error which is
40% smaller than Belle’s
BF(B+t+nt)
Non B physics
Semileptonic B:
10 papers
Radiative B decays:
10 papers
CP Violation, a:
5 papers
Charmless
Hadronic B:
19 papers
Charm(onium)
prod and decay
13 papers
B to charm decays:
12 papers
Tau and low-energy:
8 papers
Charm(onium)
spectroscopy:
16 papers
CP Violation g:
8 papers
CP Violation, b:
14 papers
Reviewed in http://ichep06.jinr.ru/reports/4_11p30_pakhlov.ppt
Belle has another “2s” effect in DK
 Close to observation?
D mixing
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Two innovative results in multibody decays
K
K0
RM=(0.023+0.018-0.014)%
RM=(0.019+0.016-0.015)%
Combined
RM=(0.020+0.011-0.010)%
No mixing possible @ 2.1% C.L.
More new states
Yy(2S)
Inconsistent with Y(4260): yet
another state?
Confirmation of Belle + better params
Xc’
First observation
(in 3 states)
DsJ
Wc*
Summary
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At ICHEP’06 BaBar has achieved record productivity, overwhelming the direct
competitor
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Congratulations to everybody!!!
In the topics where the luminosity matters the refined statistical analysis
technique makes BaBar competitive even with 35% less luminosity (345 M
BB/547 M BB)
Showed dominance in several areas such as:
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CPV in bs penguins
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Measurements related to a
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Innovative technique to exploit also these decay modes
Leptonic B Decays
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First full analysis of BKKK0 (including fK0)
D-mixing in multibody D decays
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First observation of Br0r0
Full listing of conf paps (ordered by topic) in
http://www.slac.stanford.edu/BFROOT/www/Phy
sics/Planning2006/ICHEP/ICHEP_pap.html
Dalitz Time Dependent analyses
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New modes
After Belle corrected a mistake in their efficiencies, we have a measurement of BF(Btn) with same
accuracy as them and potentially 40% better by fall
semileptonic B decays, Charm and Charmonium spectroscopy, …
Backup slides
Update of rr,r
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rr
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S=-0.19±0.21
C=-0.07±0.15  aeff=(96+7-6)o [was 100+10-7]
fL=0.977±0.024
r
now
was
A=-0.142+/-0.041+/-0.015
S=0.01+/-0.12+/-0.03
C=0.154+/-0.090+/-0.037
Direct CPV now at 3 sigma
A=-0.088+/-0.049+/-0.013
S=-0.10+/-0.14+/-0.04
C=0.34+/-0.11+/-0.05
Impact on a
Improvement in h0,0 allow to almost
exclude dips between the multiple solutions
Evolution of sin2b measurements
Present
WA
Present
CKM fit
BABAR 0.722±0.040±0.023
Belle 0.652±0.039±0.020
BaBar 2006: 0.710±0.034
Evolution of SfK measurements
BaBar 2006: 0.31±0.29
BABAR 0.50±0.25±0.07
Belle 0.44±0.27±0.05
Dalitz analysis allows better understanding
of interference of other modes
Summary
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Alpha
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Evidence of r0r0 spoils measurement of a
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 measurements redone with reduced errors
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Dalitz KKKs measurement
Update on all bs penguin
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Behind Belle  found we have to improve quickly sensitivity
D mixing
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First evidence of the charged mode
Our own observation of the neutral modes (half way wrt Belle)
tn
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Lot of input to reduction of theo errors
rg
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H’Ks closer to SM
Others mostly similar
Semileptonic
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rB getting further smaller  increased error on g
Beta
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4s evidence of CP violation
Update on gamma
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Error up to 20o
Two of the three most sensitive modes ready (the other one is coming)
Still only at the 2s level
Progress on spectroscopy
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New puzzles