Threshold Resummation in B --> X_c l nu_l Decays
arXiv:0707.2010 · doi:10.1016/j.physletb.2007.07.041
Abstract
We compute the QCD form factor resumming threshold logarithms in B --> X_c + l + nu_l decays to next-to-leading logarithmic approximation. We present an interpolation formula including soft as well as collinear effects softened by the non-vanishing charm mass.
24 pages, no figures