Estimates of B-decays into K-Resonances and Dileptons

Details Estimates of B-decays into K-Resonances and Dileptons Estimates of B-decays into K-Resonances and Dileptons

1995-06-05

arxiv.org/abs/hep-ph/9506235v1

Z.Phys.C71:301-306,1996

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, LATEX, no figures

Scientific paper

10.1007/s002880050174

Short and long distance contributions to the exclusive B-decays into various K-resonances and dileptons, i.e. B --> Ki l l ( l = e, mu , nu ), are examined. The heavy quark effective theory has been used to calculate the hadronic matrix elements. Substantial branching fractions are obtained for the dileptonic B-decays into some higher excited states of K-mesons. The long distance (resonance) contributions to these exclusive rare B-decay modes dominate the short distance contributions mostly by two orders of magnitude. It is pointed out that, excluding the resonance contributions, the P-wave channels are dominant, accounting for about 50% of the inclusive B --> X_s l l branching fraction.

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