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arXiv · hep-ph/9501296

QCD Radiative Corrections to the Leptonic Decay Rate of the B_c Meson

Eric Braaten·Sean Fleming
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Abstract

The QCD radiative corrections to the leptonic decay rate of the $B_c$ meson are calculated using the formalism of nonrelativistic QCD (NRQCD) to separate short-distance and long-distance effects. The $B_c$ decay constant is factored into a sum of NRQCD matrix elements each multiplied by a short-distance coefficient. The short-distance coefficient for the leading matrix element is calculated to order $α_s$ by matching a perturbative calculation in full QCD with the corresponding perturbative calculation in NRQCD. This short-distance correction decreases the leptonic decay rate by approximately $15\%$.

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Eric Braaten, Sean Fleming. 1995-03-27. QCD Radiative Corrections to the Leptonic Decay Rate of the B_c Meson. https://doi.org/10.1103/physrevd.52.181

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