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

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 http://www.slac.stanford.edu/BFROOT/www/Physics/Planning2006/ICHEP/ICHEP_pap.html Two plenary talks 24 parallel talks in 6 different sessions All updates are on 345 fb-1 (315 onpeak) Up to June 1st

Publication History Since Sep 1 2005: BaBar: 70 Belle 28

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

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

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 http://ichep06.jinr.ru/reports/2_hazumi_ichep2006.ppt and 3_10p20_Kowalewski.pdf

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

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 (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

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

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

Measurement of a No news from Belle The error on a from rr is dominated by the limit on r0r0 N00 = 98+32 ± 22 −31 First evidence of Br0r0 B0 Significance 3.0  = [1.2 ± 0.4 (stat.) ± 0.3 (syst.)]x10-6 fL= 0.86+0.11-0.13 (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

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

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

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.

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+/-31+12-10+14-11 ) g = 92 +/- 41 +/-10 +/- 16

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 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 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 ’06 315 fb-1

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++)

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 http://ichep06.jinr.ru/reports/4_11p30_pakhlov.ppt

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

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 http://www.slac.stanford.edu/BFROOT/www/Physics/Planning2006/ICHEP/ICHEP_pap.html

Backup slides

Update of rr, rp r+r- rp S=-0.19±0.21 C=-0.07±0.15  aeff=(96+7-6)o [was 100+10-7] fL=0.977±0.024 rp now was A=-0.142+/-0.041+/-0.015 S=0.01+/-0.12+/-0.03 C=0.154+/-0.090+/-0.037 A=-0.088+/-0.049+/-0.013 S=-0.10+/-0.14+/-0.04 C=0.34+/-0.11+/-0.05 Direct CPV now at 3 sigma

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

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

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

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