1 / 30

Search for new physics in B to VV decays and other hot topics from Belle

Search for new physics in B to VV decays and other hot topics from Belle. Katsumi Senyo Nagoya University. Today’s topics. ~B →VV decays. New! Submitted to PRL on Mar.8 th , 2005. B → f K * update with 253 fb -1 (dataset collected by June `04, 274.5 ×10 6 BB ) Polarization

kalkin
Download Presentation

Search for new physics in B to VV decays and other hot topics from Belle

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Search for new physics in B to VV decaysand other hot topics from Belle Katsumi Senyo Nagoya University Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  2. Today’s topics ~B →VV decays New! Submitted to PRL on Mar.8th, 2005 B→ f K* update with 253 fb-1 (dataset collected by June `04, 274.5×106BB) • Polarization • Full angular analysis and new physics search B+→r+K* update with 253 fb-1 • Polarization • Branching Fraction New! (preliminary) Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  3. S S S S S S S S S B decays into two vector mesons Polarization reveals spin structure in the decay f B A0 A+ A- d b K* d d d Spin=0 Helicity amplitudes: A0, A+, A- A0 requires no spin flip, A+ requires one spin flip A- requires two spin flips. 11 observables(B and B): 6| Ai |, 5 arg(Ai / Aj) cf. fK±: 2 observables: | Ai |, | Ai |, fKS: 3 observables: | Ai |, | Ai |, arg(A / A) Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  4. Polarization in B  V V decay Angles in transversity basis Differential cross section looks so complicated,but not, actually. Physics implication and recent experimental results are reviewed here. Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  5. Polarization in B  V V decay Factorization, as well as simple quantum mechanics predicts: Longitudinal ~ 1 Transverse ~ 0 So, the distribution is expected to be dominated by longitudinal polarization( fL~1 ) Is this true? Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  6. B  V V tree decay Diagrams and tables are from presentation of P.J. Clark@FPCP2004 Yes, it is true for trees. fL~1 Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  7. Today 275 275 275 Polarization puzzle in pure penguin decays: B f K*±/0 and B r -K*0 • Rescattering? • An enhanced New Standard Model Amplitude? • New Physics? Diagrams and tables are from presentation of P.J. Clark@FPCP2004 But, this is not true in B f K* and r-K*0!! fL deviates from 1 in both Belle and BaBar. Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  8. New physics in B f K*±/0 • Further, extracting the triple-products asymmetry w/ B flight direction and two meson polarizations (T-odd CP Violation search) • Experimentally, the following observables are sensitive to new physics: subscript i is one of {0, //}. (polarization) non-0 possible w/ FSI D. London, N.Sinha and R. Sinha(2004) Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  9. Analysis results for B f K*±/0 What we look at here: • Confirm fL≠1 in bs pure penguin decay • Perform a fully angular analysis Submitted to PRL, hep-ex/0503013 Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  10. B f K*±/0: signal extraction 253fb-1 • Mass cuts • PID • Event topology Yields: B f K*0:173±16 events B f K*±:85 +12 events -11 BG: qq continuum K+K-K*, f0K*(a few %) No updated Branching Fraction results. Direct CP Violation ~ 0 Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  11. B f K*±/0: angular analysis Submitted to PRL Fully angular analysis is performed. 10.2s (B f K*0) and 5.6s (B f K*±) deviations from 1 in fL Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  12. B f K*±/0: angular analysis B f K*0: DCPV~ 0 B f K*0: SM-consistent Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  13. -0.41 ±0.04 +0.16 -0.14 -0.16 ±0.03 +0.16 -0.14 B f K*0: new physics search VV puzzle (if fL<<1) 0.45±0.05±0.02 0.24±0.06±0.02 0.31±0.06±0.01 Can be non-0 (FSI in SM) -0.06±0.10±0.01 -0.06±0.10±0.01 -0.06±0.05±0.01 NP if non-0 -0.01±0.06±0.01 0.06±0.05±0.01 0.01±0.10±0.02 -0.11±0.11±0.02 Submitted to PRL Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  14. Analysis results for B r±K*0 What we look at here: • Measure fL and see whether it deviates from 1 • Branching fraction measurement ~Another bspure penguin decay Preliminary results Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  15. B+r+K*0: DE-Mbc plots 253 fb-1 • Nsig = 134.8 ±16.9 (B+p+p-p0K+ before non- resonant component subtraction) B+p+p-p0K+ b →c tran. qq continuum Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  16. B+r+K*0: M(pp0) / M(Kp) fit ~ non-resonant subtraction S=5.3s K*: 85.4±16.1 evts Non res.:28.8±4.1 evts r: 125.4±15.8 evts Non res.:-0.3±3.0 evts Fit with P-wave Breit-Wigner(+ det.res.) for signal, phase-space for non-res. Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  17. cosqhelr+ cosqhelK*0 systematics fL=0.43±0.11(stat.) +0.05 (syst.) -0.02 B+r+K*0: Polarization result A0 A± BG Preliminary results Systematic error from ArKp interference is ~ 0.5% Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  18. B+r+K*0: Branching Fraction BF( B+r+K*0) =(8.9±1.7(stat.) ±1.0(syst.))×10-6 Preliminary results Systematic uncertainties Measured fL is usedto determine the BF. Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  19. Summary • VV polarization puzzle in bs penguin decays (f K*/r-K*) confirmed, fL deviates from 1 for both modes. A fully angular analysis and triple-product correlation investigated for B f K* • Experimental results provide stimulus to theoretical models of B decay Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  20. New physics in B f K*±/0 (backup) • All suggested variables by D. London, N. Sinha and R. Sinha(2004). • r param. needs time-dependent analysis, though we have not done yet. Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  21. B f K*±/0 : details (backup) • Not really. See hep-ex/0503013. Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  22. B+r+K*0: details (backup) Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  23. B+r+K*0: details (backup) Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  24. B+r+K*0: details (backup) Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  25. B+r+K*0: details (backup) Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  26. B+r+K*0: details (backup) Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  27. B+r+K*0: details (backup) Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  28. B+r+K*0: details (backup) Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  29. B+r+K*0: details (backup) Belle B->VV, XXXX Recontres de Moriond - Mar. 11

  30. B+r+K*0: details (backup) 0.5 Belle B->VV, XXXX Recontres de Moriond - Mar. 11

More Related