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“ Hot Topics ” from BaBar

“ Hot Topics ” from BaBar. Vasilii G. Shelkov Lawerence Berkeley National Laboratory. BaBar Collaboration. “ Hot Topics ” from BaBar. qq. e -. e +. Other B. e +. e -. Signal B. Common Analyses Features. Source of Bs. Approach.

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“ Hot Topics ” from BaBar

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  1. “Hot Topics” from BaBar Vasilii G. Shelkov Lawerence Berkeley National Laboratory BaBar Collaboration

  2. “Hot Topics” from BaBar

  3. qq e- e+ Other B e+ e- Signal B Common Analyses Features Source of Bs Approach all analyses are blinded Variables event shape variables:

  4. Energy flow around B-thrust axis Analytical approach Numerical approach Bsig-thrust Bsig-thrust Ln – Legendre polynomial of nthpower We found that S/B discriminating power of 9-cone Fisher is identical to using a single polynomial L2

  5. Analyses of decays “tree” is Cabibbo suppressed Interference between “penguins”: enhance: suppress:

  6. Large rate for decays approximates a flavor singlet state QCD anomaly, glue coupling to “charming” penguins – c enhanced in loop

  7. Event selection for decays selection of resonances: suppress continuum with: extract signal with: PDFs were validated with independent sample of fully reconstructed events Example:

  8. Results for measurement

  9. Results for measurements

  10. Projections for fit mES DE mES DE

  11. Projections for fit mES DE mES DE

  12. All results in units of 10-6

  13. Analysis of decays Motivation charmless decays of charged Bs are interesting for direct-CP searches and extraction of CKM angle g Approach use all available PID information(DCH,SVT,DIRC) to separate ps and Ks explicitly veto decays into 2 charged hadrons efficiencies for signal and largest background contributions are calculated as a function of Dalitz plot perform Cut&Count analysis of the entire Dalitz plot

  14. Analysis of decays PID cross-feeds in % Charm Veto veto all possible combinations of K and p which end up within mass window of peak vetom(p+p-)and m(K+K-) mass combinations within of peaks

  15. Analysis of decays Continuum Suppression signal

  16. Analysis of decays Signal Box Grand Side Band Background propagation Using ARGUS shape of mES, and 2nd order polynomial for DE, the background from GSB is propagated into the Signal Box(using multiplicative factor R)

  17. Dalitz plot for decays GSB Signal Box m2(p+p-)max m2(p+p-)max m2(p+p-)min m2(p+p-)min

  18. Dalitz plot for decays GSB Signal Box m2(p+p-) m2(p+p-) m2(K+p-) m2(K+p-)

  19. Dalitz plot for decays GSB Signal Box m2(K+K-) m2(K+K-) m2(p+K-) m2(p+K-)

  20. Dalitz plot for decays GSB Signal Box m2(K+K-)max m2(K+K-)max m2(K+K-)min m2(K+K-)min

  21. Results B-bkg DE mES

  22. Results B-bkg mES DE

  23. Results

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