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The Pure Leptonic Decays of B_c Meson and Their Radiative Corrections

Chao-hsi Chang·Cai-Dian Lu·Guo-Li Wang·Hong-Shi Zong
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Abstract

The radiative corrections to the pure leptonic decay $B_c \to \ellν_{\ell}$ up-to one-loop order is presented. How to cancel the infrared divergences appearing in the loop calculations, and the radiative decay $B_c \to \ellν_{\ell}γ$ is shown precisely. It is emphasized that the radiative decay may be separated properly and may compare with measurements directly as long as the theoretical `softness' of the photon corresponds to the experimental resolutions. Furthermore with a kind of non-relativistic constituent quark model, a kind of typical long distance contributions to the radiative decays is estimated, and it is shown that the contributions are negligible in comparison with the accuracy of one-loop corrections and the expected experimental measurements.

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Chao-hsi Chang, Cai-Dian Lu, Guo-Li Wang, Hong-Shi Zong. 1999-04-28. The Pure Leptonic Decays of B_c Meson and Their Radiative Corrections. https://doi.org/10.1103/physrevd.60.114013

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