BABAR Physics Results and Future Plans David B. MacFarlane SLUO Annual Meeting September 26, 2005

Sep 26, 2005BABAR Physics Results and Future Plans2 INFN, Perugia & Univ INFN, Roma & Univ "La Sapienza" INFN, Torino & Univ INFN, Trieste & Univ The Netherlands [1/4] NIKHEF, Amsterdam Norway[1/3] U of Bergen Russia[1/13] Budker Institute, Novosibirsk Spain[2/3] IFAE-Barcelona IFIC-Valencia United Kingdom [11/75] U of Birmingham U of Bristol Brunel U U of Edinburgh U of Liverpool Imperial College Queen Mary, U of London U of London, Royal Holloway U of Manchester Rutherford Appleton Laboratory U of Warwick USA[38/311] California Institute of Technology UC, Irvine UC, Los Angeles UC, Riverside UC, San Diego UC, Santa Barbara UC, Santa Cruz U of Cincinnati U of Colorado Colorado State Harvard U U of Iowa Iowa State U LBNL LLNL U of Louisville U of Maryland U of Massachusetts, Amherst MIT U of Mississippi Mount Holyoke College SUNY, Albany U of Notre Dame Ohio State U U of Oregon U of Pennsylvania Prairie View A&M U Princeton U SLAC U of South Carolina Stanford U U of Tennessee U of Texas at Austin U of Texas at Dallas Vanderbilt U of Wisconsin Yale Canada[4/24] U of British Columbia McGill U U de Montréal U of Victoria China[1/5] Inst. of High Energy Physics, Beijing France[5/53] LAPP, Annecy LAL Orsay The BABAR Collaboration 11 Countries 80 Institutions 623 Physicists LPNHE des Universités Paris VI et VII Ecole Polytechnique, Laboratoire Leprince-Ringuet CEA, DAPNIA, CE-Saclay Germany[5/24] Ruhr U Bochum U Dortmund Technische U Dresden U Heidelberg U Rostock Italy[12/99] INFN, Bari INFN, Ferrara Lab. Nazionali di Frascati dell' INFN INFN, Genova & Univ INFN, Milano & Univ INFN, Napoli & Univ INFN, Padova & Univ INFN, Pisa & Univ & Scuola Normale Superiore

Sep 26, 2005BABAR Physics Results and Future Plans3 BABAR Detector DIRC  PID) 144 quartz bars PMs 1.5T solenoid EMC 6580 CsI(Tl) crystals Drift Chamber 40 layers Instrumented Flux Return iron / RPCs or LSTs (muon / neutral hadrons) Silicon Vertex Tracker 5 layers, double sided strips e  (3.1GeV) e  (9GeV) Collaboration founded in 1993 Detector commissioned in 1999

Sep 26, 2005BABAR Physics Results and Future Plans4 Integrated data sample to date New milestone at 300 fb -1 delivered

Sep 26, 2005BABAR Physics Results and Future Plans5 PEP-II Monthly Delivery Run 4 Run 5 Safety stand-down

Sep 26, 2005BABAR Physics Results and Future Plans6 PEP-II Daily Average Delivery Run 4 Run 5 Safety stand-down

Sep 26, 2005BABAR Physics Results and Future Plans7 Performance: Run 4 Actual Prediction July 2003

Sep 26, 2005BABAR Physics Results and Future Plans8 Performance: Run 5 Power outage BPM loss Actual Prediction Apr 2005

Sep 26, 2005BABAR Physics Results and Future Plans9 Projected data sample  Goal is 1.2x10 34 by next spring o 3300 mA LER on 1700 mA HER  4 month down in 2006 for IR vacuum, rf, and feedback system work o Goal is to improve peak luminosity to 2x10 34 by : Double data to 450 fb : Double again to 1000 fb -1 LST installation

Sep 26, 2005BABAR Physics Results and Future Plans10 Pillars of BABAR physics program  Highly constrained and redundant set of precision tests of weak interactions in the Standard Model  Searches for physics beyond the Standard Model in a well understood & characterized environment oSensitivity to New Physics at LHC mass scales through rare decays and CP violation oDiscovery potential from large data sample across a whole range of beauty, charm, tau, two-photon, ISR physics oFull program of flavor physics/CP violation measurements will provide a legacy of fundamental constraints on future New Physics discoveries Challenging measurements at the edge of sensitivity benefit enormously from operation of both PEP-II & KEK B Factories

Sep 26, 2005BABAR Physics Results and Future Plans11 Weak Interaction in Standard Model Unitarity Triangle as a summary of Standard Model b physics + phases CP violation

Sep 26, 2005BABAR Physics Results and Future Plans12 CP violation in B decays  CPV through interference of decay amplitudes

Sep 26, 2005BABAR Physics Results and Future Plans13 Interference of b  c tree decay with mixing CPV in charmonium modes

Sep 26, 2005BABAR Physics Results and Future Plans14

Sep 26, 2005BABAR Physics Results and Future Plans15

Sep 26, 2005BABAR Physics Results and Future Plans16 Recoil B + vertex separation = time difference

Sep 26, 2005BABAR Physics Results and Future Plans17 sin2  results from charmonium modes BABAR PUB-04/038 Update for ICHEP04 B A B AR Belle update for LP05

Sep 26, 2005BABAR Physics Results and Future Plans18 BABAR & Belle physics results Journal PapersBABARBelle < Sept Total Conference Contributions BABARBelle Papers submitted to ICHEP Abstracts submitted to LP

Sep 26, 2005BABAR Physics Results and Future Plans19 Observation of Y(4260)  J/  +  - in ISR oSignal 123±23 events; >8σ statistical significance oMass (4258±8) MeV; just above D S D S threshold oTotal width (88±23) MeV  (2S) hep-ex/ LP fb -1 Joins growing list of not understood heavy mass states

Sep 26, 2005BABAR Physics Results and Future Plans20 Interference of suppressed b  u tree decay with mixing CPV in charmless modes 3 rd component: sizable Penguin diagram

Sep 26, 2005BABAR Physics Results and Future Plans21 New approach from BABAR: B      Extraction of  similar to , but with advantage of smaller Penguin pollution: Moriond EW05 B A B AR BABAR PUB-05/007 BABAR PUB-04/048

Sep 26, 2005BABAR Physics Results and Future Plans22 Summary of constraints on  Mirror solutions disfavored BABAR only Object lesson: with data in hand, clever analysis ideas will emerge

Sep 26, 2005BABAR Physics Results and Future Plans23 Unexpectedly good progress on gamma! Interference of color-allowed and color-suppressed tree decays Effect depends on ratio of two diagrams

Sep 26, 2005BABAR Physics Results and Future Plans24 Dalitz plot analysis for gamma Idea: Increase B decay interference through D decay Dalitz plot Object lesson: with data in hand, clever analysis ideas will emerge

Sep 26, 2005BABAR Physics Results and Future Plans25 UT from sin2  & indirect constraints Paradigm change! Now: looking for New Physics as correction to CKM

Sep 26, 2005BABAR Physics Results and Future Plans26 UT from CP violation measurements alone New B Factory milestone: Comparable UT precision from CPV alone

Sep 26, 2005BABAR Physics Results and Future Plans27 Interference of suppressed b  s Penguin decay with mixing CPV in Penguin Modes

Sep 26, 2005BABAR Physics Results and Future Plans28 Potential New Physics contributions “Internal Penguin” SUSY contribution with new phases New physics in loops?

Sep 26, 2005BABAR Physics Results and Future Plans29 CPV in charmonium & s-penguin modes No sign of Direct CP 3.7  between CP violation in s-penguin vs sin2  (cc) Charmonium s-Penguins Good consistency between B Factory experiments Winter 05 results

Sep 26, 2005BABAR Physics Results and Future Plans30 How good are Standard Model predictions? Present SM uncertainty Beneke, CKM05

Sep 26, 2005BABAR Physics Results and Future Plans31 New three-body mode: B  K S K S K S 88±10 signal events BABAR PUB-04/052 y x Beam constraint Aspen05

Sep 26, 2005BABAR Physics Results and Future Plans32 After summer 2005 updates No sign of Direct CP 2.4  between CP violation in s-penguin vs sin2  (cc) Summer 05 results About 0.5  loss from shift in charmonium average Charmonium s-Penguins

Sep 26, 2005BABAR Physics Results and Future Plans33 Snapshot: Summer 2008 K*K* 5  discovery region if non-SM physics is 0.30 effect 2004=240 fb =450 fb =1 ab -1 Golden modes reach 5 sigma level Projections are statistical errors only; but systematic errors at few percent level Luminosity expectations : f 0 K S K S  0  K S  ’K S KKK S

Sep 26, 2005BABAR Physics Results and Future Plans34 Global CKM fit: % contours

Sep 26, 2005BABAR Physics Results and Future Plans35 now2008 UT constraints in 2008 Assumption: no NP in trees [almost any NP model] 68% contours Significant constraint on all New Physics models in LHC era

Sep 26, 2005BABAR Physics Results and Future Plans36 Bounds on new physics now 2008 Model independent If translated in terms of probed new physics mass scale  (now) ~ 5 TeV  (2008) ~ 10TeV Introduce new physics in mixing diagram

Sep 26, 2005BABAR Physics Results and Future Plans37 Summary: Physics plans for BABAR  Goal for : double current data set o Delay in Run 5 can be overcome by summer 2006 with extended running period, with substantial reduction in errors on CP violation asymmetries in rare decay modes o Error on average of Penguin modes should reach 0.06  Goal for : double again to ~1 ab -1 o Individual Penguin modes with errors in range o Suite of fundamental Standard Model measurements with substantially improved levels of precision  Beyond 2008 might offer exciting opportunities if New Physics has been seen by B Factories & LHC oSensitivity to New Physics through rare decays, CP violation, & large data sample with a significant discovery potential oFull program of flavor physics/CP violation measurements provide fundamental constraints on future New Physics discoveries

Backup

Sep 26, 2005BABAR Physics Results and Future Plans39 DCH electronics upgrade  Motivation: o Reduce deadtime due to serialization and shipping of data from DIOM to ROM  Upgrade in two steps: o Phase 1 (summer 2004) Ship only 1/2 waveform information (32  16 bytes) from frontends No change observed with data o Phase 2 (Oct 2005) Larger FPGA for feature extraction before transmission  hardware change New boards in production

Sep 26, 2005BABAR Physics Results and Future Plans40 IFR upgrade with LSTs Bottom & top sextants installed summer 2004 Remaining sextants wait until summer 2006

Sep 26, 2005BABAR Physics Results and Future Plans41 LSTs are fully operational New LST sextants Efficiency curves from Run 5 data Old RPC sextants