The Pure Leptonic Decays of B_c Meson and Their Radiative Corrections

Details The Pure Leptonic Decays of B_c Meson and Their Radiative Corrections The Pure Leptonic Decays of B_c Meson and Their Radiative Corrections

1999-04-28

arxiv.org/abs/hep-ph/9904471v1

Phys.Rev.D60:114013,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages including 6 figures, REVTeX

Scientific paper

10.1103/PhysRevD.60.114013

The radiative corrections to the pure leptonic decay $B_c \to \ell\nu_{\ell}$ up-to one-loop order is presented. How to cancel the infrared divergences appearing in the loop calculations, and the radiative decay $B_c \to \ell\nu_{\ell}\gamma$ 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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