$V_{cs}$ from Pure Leptonic Decays of $D_s$ with Radiative Corrections

Details $V_{cs}$ from Pure Leptonic Decays of $D_s$ with Radiative Corrections $V_{cs}$ from Pure Leptonic Decays of $D_s$ with Radiative Corrections

2001-02-23

arxiv.org/abs/hep-ph/0102293v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 1 Latex file, 3 PS figures

Scientific paper

The radiative corrections to the pure leptonic decay $D_s{\longrightarrow} {\ell}{{\nu}}_{\ell}$ up-to one-loop order is presented. We find the virtual photon loop corrections to $D_s{\longrightarrow} {\tau}{{\nu}}_{\tau}$ is negative and the corresponding branching ratio is larger than $3.51\times 10^{-3}$. Considering the possible experimental resolutions, our prediction of the radiative decay $D_s{\longrightarrow} {\tau}{{\nu}}_{\tau}\gamma$ is not so large as others, and the best radiative channel to determine the $V_{cs}$ or $f_{D_s}$ is $D_s{\longrightarrow} {\mu}{{\nu}}_{\mu}{\gamma}$.

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