Semileptonic decays of Bc mesons into charmonium states in a relativistic quark model

Details Semileptonic decays of Bc mesons into charmonium states in a relativistic quark model Semileptonic decays of Bc mesons into charmonium states in a relativistic quark model

2005-01-07

arxiv.org/abs/hep-ph/0501051v2

Phys.Rev. D71 (2005) 094006; Erratum-ibid. D75 (2007) 019901

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages RevTex, this version will appear in Physical Review D

Scientific paper

10.1103/PhysRevD.71.094006

We use the framework of a relativistic constituent quark model to study the semileptonic transitions of the Bc meson into CCbar charmonium states where CCbar = etaC (1S0), J/psi (3S1), chiC0 (3P0), chiC1 (3P1), hc (1P1), chiC2 (3P2), psi (3D2). We compute the q^2-dependence of all relevant form factors and give predictions for their semileptonic Bc decay modes including also their tau-modes. We derive a formula for the polar angle distribution of the charged lepton in the (l nu) c.m. frame and compute the partial helicity rates that multiply the angular factors in the decay distribution. For the discovery channel [B_c => J/psi (=> mu+ mu-) l nu] we compute the transverse/longitudinal composition of the J/psi which can be determined by an angular analysis of the decay J/psi => mu+ mu-. We compare our results with the results of other calculations.

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