Relativistic Description of Exclusive Semileptonic Decays of Heavy Mesons

Details Relativistic Description of Exclusive Semileptonic Decays of Heavy Mesons Relativistic Description of Exclusive Semileptonic Decays of Heavy Mesons

1995-06-02

arxiv.org/abs/hep-ph/9506220v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, LATEX, 2 figures inclosed + 4 Postscript figures

Scientific paper

10.1103/PhysRevD.53.1391

Using quasipotential approach, we have studied exclusive semileptonic decays of heavy mesons with the account of relativistic effects. Due to more complete relativistic description of the $s$ quark more precise expressions for semileptonic form factors are obtained. Various differential distributions in exclusive semileptonic decays of heavy mesons are calculated. It is argued that consistent account of relativistic effects and HQET motivated choice of the parameters of quark-antiquark potential allow to get reliable value for the ratio $A_2(0)/A_1(0)$ in the $D\to K^*l\nu_l$ decay as well as the ratio~$\Gamma(D\to K^*l\nu_l)/\Gamma(D\to Kl\nu_l)$. All calculated branching ratios are in accord with available experimental data.

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