At Belle Katsumi Senyo Nagoya University May 16~18, 2002 Flavor Physics and CP Violation ~ Exclusive and Inclusive Analysis Results.

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Presentation transcript:

at Belle Katsumi Senyo Nagoya University May 16~18, 2002 Flavor Physics and CP Violation ~ Exclusive and Inclusive Analysis Results

Flavor Changing Neutral Current (FCNC) process is sensitive to new physics (SUSY, charged Higgs…). Very rare decays(BF~10 -6 (exclusive),10 -5 (inclusive)). Exclusive mode – experimentally easy to analyze. Inclusive mode – theoretically easy to extract parameters. Introduction

Standard Model are calculated to NNLO Ali-Lunghi-Greub-Hiller, hep-ph/ Effective Hamiltonian Approach Beyond SM …is expressed as corrections to SM

Exclusive mode analysis results PRL (2002) A.Ishikawa, Ph.D Thesis, Nagoya Univ. (2002) 29fb -1 data

Signals are identified by fitting Beam energy constraint mass (M bc ) through this talk. Inclusive Analysis in General Two kinematical variables to identify B mesons Beam constraint massEnergy difference qq continuum/charmonium background suppression Double b->clv->slv, c->slv decay background suppression Lepton ID, Fisher Discriminant (Missing Mass, Total Energy ) Thrust angle, B flight direction, Energy difference (  E), veto mass region

Reconstruction efficiency: Inclusive: ~4% Exclusive: ~10% 43fb-1 data used in this inclusive analysis.

Based on the NNLO calculation. [Ali-Lunghi-Greub-Hiller, hep-ph/ ]

J/  Suppression For exclusive modes For inclusive modes Rejected Charmonium contaminations after veto:Tight charmonia veto:

Background Estimation: x mis-ID(fake) rate measured w/ data Muon ID fake rate: 1~2% with 80~85% efficiency

Inclusive mode analysis results Preliminary Preliminary First Evidence!

M(Xs) slices of M bc Distribution Inclusive mode analysis is consistent with the exclusive mode analysis in M(K), M(K*), and the higher mass region. XSe+e-XSe+e- XS+-XS+- K mass region K* mass region M(Xs)>1.0GeV/c 2 region

With higher statistics, more information will be obtained from M(Xs) and M(ll) distributions. J/psi and psi’ vetoes K K*

Systematic uncertainties

Exclusive & Inclusive: Summary Exclusive mode Inclusive mode Preliminary

Review of Measurements Experimental results agree with SM theoretical predictions. In several years experimental results will significantly improve the constraint on theoretical prediction well.

Conclusion Establish the existence of the decay First evidence on inclusive Both consistent with SM predictions Promising probe for Beyond SM physics at B-factories in next several years …stay tuned and we will be back soon.

Belle/KEKB Data Accumulation TODAY(May 18) This talk presents…

M(Xs) Distribution With the higher statistics, more information will be obtained from M(Xs) distribution.

M(ll) Distribution With the higher statistics, more information will be obtained from M(Xs) distribution.

 E distribution and fit results  E distribution fit for cross check. Signal yields are consistent with the Mbc fit results.