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

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

1995-01-13

arxiv.org/abs/hep-ph/9501296v2

Phys.Rev. D52 (1995) 181-185

Physics

High Energy Physics

High Energy Physics - Phenomenology

Changed Eq. 2 to read 1/(8 \pi), put in a missing i M_{B_c} in Eq. 18, and put in a normalisation factor of 2 M_{B_c} in Eq. 1

Scientific paper

10.1103/PhysRevD.52.181

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 $\alpha_s$ 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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