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

Guo-Li Wang; Tai-Fu Feng; Chao-Hsi Chang

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arXiv · hep-ph/0102293

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

Guo-Li Wang·Tai-Fu Feng·Chao-Hsi Chang

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Abstract

The radiative corrections to the pure leptonic decay $D_s{\longrightarrow} {\ell}{ν}_{\ell}$ up-to one-loop order is presented. We find the virtual photon loop corrections to $D_s{\longrightarrow} τ{ν}_τ$ 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 $D_s{\longrightarrow} τ{ν}_τγ$ is not so large as others, and the best radiative channel to determine the $V_{cs}$ or $f_{D_s}$ is $D_s{\longrightarrow} μ{ν}_μγ$.

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Guo-Li Wang, Tai-Fu Feng, Chao-Hsi Chang. 2001-03-02. $V_{cs}$ from Pure Leptonic Decays of $D_s$ with Radiative Corrections. https://arxiv.org/abs/hep-ph/0102293

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