1. BaBar summer success Riccardo Faccini
Universita’ “La Sapienza” and INFN Rome
BaBar Collaboration Meeting
SLAC Sep 12th 2006

2. Overall contribution to ICHEP
Belle contributed only 28 papers
114 Contributed papers
cfr 69 in 2005 and 72 in 2004
70 submitted to journal
Full listing (ordered by topic) in
Two plenary talks
24 parallel talks in 6 different sessions
All updates are on 345 fb-1 (315 onpeak)
Up to June 1st

3. Publication History
Since Sep :
BaBar: 70
Belle 28

4. Talks Content: a comparison
BaBar
Belle
Talks Content: a comparison
F P W F P W
Measurements of R=sigma_had/sigma_mumu 1 2 -
measurement of form factors 3
Probing strong interactions with the BaBar experiment
Quarkonium spectroscopy with the BaBar experiment 4
Study of recently observed mesonic Charm states and possible observation of new states
Observation of new baryonic Charm states
Study of Charmed Baryons with the BaBar experiment
Loose ends on heavy quark physics
Study of B decays to Open Charm final states
Study of the decays of Charm mesons
Study of two-body Charmless B decays 5 7
Study of multi-body Charmless B decays
Shape function from radiative B decays
b-->c lnu decays and measurement of Vcb
b-->ulnu decays and measurement of Vub
Measurements of Charmless hadronic BFs
Measurements of the CP angle alpha
Measurements of the CP angle gamma
Study of exclusive rad and ew penguin B decays
Search for mixing and CP violation in D decays
Measurement of the angle beta in Charmless B decays 6
Measurements of CP violation in B-->Charm decays
Search for leptonic B decays
Search for physics BSM in tau decays and production
total 31 40 66 33 19 16
Legenda:
F: new on full stat
P: new on partial stat
W: already presented in winter ‘06
Same set of results on the very last chunk of data, but otherwise BaBar has >2 times more results
Note: both collaborations presented all results new since last round on summer conferences

5. 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
CP Violation g:
8 papers
Charm(onium) spectroscopy:
16 papers
CP Violation, b:
14 papers
Courtesy of D. Lange

6. 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
CP Violation g:
8 papers
Charm(onium) spectroscopy:
16 papers
CP Violation, b:
14 papers
Reviewed in and 3_10p20_Kowalewski.pdf

7. CP violation in Charmonium
Repeated standard set of measurements
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

8. 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)

9. bs penguins (b g s) (b g c) sin2beff = 0.52 ± 0.05
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

10. BK+K-K0 75% of BKKK0 is not BfKs
First ambiguity free measurement of b in bs penguins
BK+K-K0
75% of BKKK0 is not BfKs
Important to understand the underlying background and its interference
Full Dalitz analysis performed (with f,f0, and non resonant component)
Knowledge of strong phase allows to extract weak phases without ambiguities
Assuming SM (i.e. same weak phase for all final states)
b=0.38±0.08 rad [SM=0.35]  very good agreement with SM
ambiguity on b resolved at the 4s level (SM favored)
Twice more sensitive that Belle in BDh0

11. First TD analysis in bd penguins
BKsKs
sPlots
Old Result:

12. Measurement of a
No news from Belle
The error on a from rr is dominated by the limit on r0r0
N00 = ± 22
−31
First evidence of Br0r0
B0
Significance 3.0
 = [1.2 ± 0.4 (stat.) ± 0.3 (syst.)]x10-6
fL= (stat.) ± 0.06 (syst.)

f
Error on a from 11o to 14o
Previous BaBar result: (0.5±0.4) 10-6
Belle never presented a result
Highly improved sensitivity

13. Update on 2-body Br00 = (1.48 ± 0.26 ± 0.12)  10−6 B0 tags 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

14. Comparison with Belle’s pp
(C = -A)
2.3s diff. btw. Belle and BaBar

15. Interpreting Bpp, Brr, and Brp results in terms of a
CKM fit
no  in fit
169.7°
  [164, 176]º at 68.3% C.L.

16. Measurement of g Update of BD0K [Dalitz] BD*K BDK 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+
-0.072±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
(was 70+/ )
g = 92 +/- 41 +/-10 +/- 16

17. Other B decays Semileptonic and leptonic B: Radiative B decays:
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
CP Violation g:
8 papers
Charm(onium) spectroscopy:
16 papers
CP Violation, b:
14 papers
Reviewed in and 3_10p20_Kowalewski.pdf

18. buln exclusive: probing theory
Old technique, 80 fb-1
New “loose cuts method”
4 more results on Vub and 2 on Vcb

19. Brg No update from Belle BaBar ’06 315 fb-1
We have our own observation of all modes (as opposed to only r0g)
Central values in between ours past ones and Belle
BaBar ’ fb-1

20. Btn: a year of emotions
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:
BaBar presents only one of the two independent analyses while still investigating
Belle presents an errata of the efficiencies by a factor 2!!!!
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++)

21. Charm(onium) spectroscopy:
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
CP Violation g:
8 papers
Charm(onium) spectroscopy:
16 papers
CP Violation, b:
14 papers
Reviewed in

22. D mixing Two innovative results in multibody decays
Belle has another “2s” effect in DKp
 Close to observation?
D mixing
Two innovative results in multibody decays
Kppp
Kpp0
RM=( )%
RM=( )%
Combined
RM=( )%
No mixing 2.1% C.L.

23. More new states Yy(2S)pp
Inconsistent with Y(4260): yet another state?
More new states
Confirmation of Belle + better params
Xc’
Wc*
First observation
(in 3 states)
DsJ

24. Summary
At ICHEP’06 BaBar has achieved record productivity, overwhelming the direct competitor
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:
CPV in bs penguins
New modes
Measurements related to a
First observation of Br0r0
Dalitz Time Dependent analyses
First full analysis of BKKK0 (including fK0)
D-mixing in multibody D decays
Innovative technique to exploit also these decay modes
Leptonic B Decays
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, …
Full listing of conf paps (ordered by topic) in

25. Backup slides

26. Update of rr, rp r+r- rp S=-0.19±0.21
C=-0.07±0.15  aeff=(96+7-6)o [was ]
fL=0.977±0.024 rp
now
was
A= / / S=0.01+/-0.12+/-0.03 C=0.154+/ /-0.037
A= / / S=-0.10+/-0.14+/-0.04 C=0.34+/-0.11+/-0.05
Direct CPV now at 3 sigma

27. Impact on a
Improvement in hp0,pp0 allow to almost exclude dips between the multiple solutions

28. Evolution of sin2b measurements
Present CKM fit
Present WA
BaBar 2006: 0.710±0.034

29. Evolution of SfK measurements
BaBar 2006: 0.31±0.29
Dalitz analysis allows better understanding of interference of other modes

30. Summary Alpha Update on gamma Beta Semileptonic rg tn D mixing
Evidence of r0r0 spoils measurement of a
Error up to 20o
pp measurements redone with reduced errors
4s evidence of CP violation
Update on gamma
rB getting further smaller  increased error on g
Beta
Dalitz KKKs measurement
Update on all bs penguin
H’Ks closer to SM
Others mostly similar
Semileptonic
Lot of input to reduction of theo errors rg
First evidence of the charged mode
Our own observation of the neutral modes (half way wrt Belle) tn
Behind Belle  found we have to improve quickly sensitivity
D mixing
Two of the three most sensitive modes ready (the other one is coming)
Still only at the 2s level
Progress on spectroscopy
New puzzles