PEP-II/BaBar Performance, Accumulated Luminosity. BaBar has submitted over 400 papers for publication (Last year this number was 350)

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1 BABAR and SuperB Caltech group has put a major effort into the BaBar experiment, from its conception. Caltech group has also been investigating the possibility of a cm 2 s 1 SuperB collider, again from its conception. Plan of Presentations I Overview and Service (20 min) Frank Porter II Physics (40 min) Piti Ongmongkolkul & Bertrand Echenard III SuperB (20 min) David Hitlin 1 Frank Porter, Caltech DOE Review, June 29, 2009

2 PEP-II/BaBar Performance, Accumulated Luminosity BaBar finished taking data, last collisions April 7, 2008, 11:22PM Some records: High energy ring current 2.07 A Feb 29, 2008 Low energy ring current 3.2 A Apr 4, 2008 Sustained run 39 hours Mar 18-19, 2008 BaBar has submitted over 400 papers for publication (Last year this number was 350) 2 Frank Porter, Caltech DOE Review, June 29, 2009

3 The Caltech BABAR Group PhD staff David Hitlin Frank Porter Chih-hsiang Cheng Bertrand Echenard Alexander Rakitin Graduate Students David Doll Piti Ongmongkolkul Undergraduate Students Abhiram Chivukula Also, Renyuan Zhu, SuperB calorimetry Visitor positions Gerald Eigen Gregory Dubois-Felsmann CKM matrix, SuperB CKM matrix Fang Fang left August We hoped to find a replacement, but have insufficient funds. Timofei Piatenko graduated and left September Frank Porter, Caltech DOE Review, June 29, 2009

4 BABAR CaltechRoles General Collaboration leadership PEP-II accelerator Computing system, EMC, trigger Monte Carlo and skim production Tools & Validation Physics analysis, Internal reviews Also: SuperB leadership, Computing, Physics, Calorimeter Statistical tools & issues in HEP 4 Frank Porter, Caltech DOE Review, June 29, 2009

5 BABAR CaltechRoles(I) David Hitlin Terms as spokesperson, on Exec Board BaBar Publication Board Currently Deputy Director in SuperB next generation effort SuperB calorimeter co-convenor Board of Fermilab Research Alliance Frank Porter Term as Chair of Collaboration Council Chair, BaBar Speakers Bureau Editor for Analysis Optimization, BaBar(-Belle?) legacy book SuperB CDR computing chapter, Calorimeter co-convenor from Oct 09 Phenomenology Beyond the Standard Model working group co-convenor 5 Frank Porter, Caltech DOE Review, June 29, 2009

6 Chih-Hsiang Cheng BABAR CaltechRoles(II) Term as Reconstruction manager Convenor of time-dependent B to charm/charmonium analysis working group SuperB physics & computing (fastsim) SuperB co-convenor New Physics in Mixing and CP Violation working group Bertrand Echenard Data Detective innovator/developer Skim Manager, until recently Long term data access task force Analysis Optimization Group Methods for Joint Analysis (eg, BaBar/Belle) Alexander Rakitin BaBar data reprocessing; associated MC simulation Beginning duties as Skim Coordinator SuperB study for backward EMC decision Piti Ongmongkolkul Simulation Production at Caltech Particle identification MVA display tool Improved web page for simulation requests David Doll Monte Carlo production EMC electronics expert Study of EMC radiation damage 6 Frank Porter, Caltech DOE Review, June 29, 2009

7 Current Physics Analysis Topics Measurement of sin 2β in b c cs B + K + ν ν b sγ semi-inclusive analysis Search for ξ(2230) in J/ψ decays Search for η b in Υ(3S) decays Search for new bottomonium states Search for dark matter These will be discussed by Piti Ongmonkolkul and Bertrand Echenard 7 Frank Porter, Caltech DOE Review, June 29, 2009

8 Talk History (Speakers Bureau) Number of talks First physics (to ) Year 8 Frank Porter, Caltech DOE Review, June 29, 2009

9 Analysis Activity Still Going Strong Analysis CPU Usage Normalized CPU Hours/week /11/07 22/02/08 01/06/08 09/09/08 18/12/0 8/03/09 06/07/09 Date BaBar analysis CPU usage at SLAC 9 Frank Porter, Caltech DOE Review, June 29, 2009

10 Analysis Optimization (Echenard) 10 Frank Porter, Caltech DOE Review, June 29, 2009

11 Long Term Data Access InterCollaboration Tools Lead by Bertrand Echenard (slide from H. Neal, BaBar collaboration meeting, Valencia, June, 2009) 11 Frank Porter, Caltech DOE Review, June 29, 2009

12 BABAR Electromagnetic Calorimeter David Doll is EMC Electronics Expert. He has recently studied radiation damage. (Barrel front) Relative Light Yield Colors are different manufacturers Days 12 Frank Porter, Caltech DOE Review, June 29, 2009

13 Improved Particle ID with Multiclass Classifier Continuing the use of advances in other fields BaBar depends heavily on accurate particle identification (PID). PID tools constantly improving. Ongmongkolkul implemented a new Error Correcting Output Code (ECOC) algorithm for BaBar s latest K,π,p and e PlD selector, called the KM selector. ECOC is a generic algorithm for combining binary classifiers such as neural networks and decision trees into a multiclass classifier. The indicator matrix for our implementation is called an exhaustive matrix, comprised of 7 binary classifiers, each trained differently: Exhaustive matrix used in the KM selector. 1 and 0 mean the samples of that given particle type were treated as signal or background respectively for training classifier t i. t 0 t 1 t 2 t 3 t 4 t 5 t 6 K π p e Frank Porter, Caltech DOE Review, June 29, 2009

14 Improvement in Particle Identification with ECOC kk-pikloose misid* 4.0 KMLoose=Red, LHLoose=Blue, oldkmloose=green Momentum (GeV) Red: New KM selector Blue, Green: Old selectors 14 Frank Porter, Caltech DOE Review, June 29, 2009

15 Visualization Tool for Decision Trees Decision trees used in many analyses; growing in complexity as we optimize analyses. Visualization tools needed to understand and check. Ongmonkolkul has created a visualization tool: < 0.04 b gammaminenergycm gammaminenergycm < 0.07 > 0.04 < 0.85 > 0.07 helicitycosangle s h0chi2 < 2.77 gammaminenergycm > 2.77 s < 0.26 s < 0.97 > 0.26 gammamins9s25 > 0.97 s s > 0.85 h0chi2 < 1.16 s > 1.16 s Numbers cut values Node size number of training points flowing through Node color signal/background ratio flowing through Line thickness amount of signal or background 15 Frank Porter, Caltech DOE Review, June 29, 2009

16 Visualization Tool for Decision Trees (cont) Tool provides a graphical comparison of importance of variables gammaminenergycm 54.9% 5.1% 5.0% Other 16.2% 10.0% 8.7% h0uncmass helicitycosangle h0chi2 helicityangle Pie chart showing weighted sum-of-differences in figure-of-merit of node splitting. Twentytwo variables were used in constructing tree; significance is dominated by four. 16 Frank Porter, Caltech DOE Review, June 29, 2009

17 Comments, BaBar Leadership and service roles in collaboration continue Much physics continues to be underway There is considerable room for further sensitivity to new physics in B decays Motivation for SuperB Plan of Presentations I Overview and Service (20 min) Frank Porter II Physics (40 min) Piti Ongmongkolkul & Bertand Echenard III SuperB (20 min) David Hitlin 17 Frank Porter, Caltech DOE Review, June 29, 2009