Threshold Resummation in B --> X_c l nu_l Decays

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

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• Determination of the CKM matrix elements |V(xb)|
• Heavy Quark Fragmentation in $e^{+}{e}^{-}$ Collisions to NNLO+NNLL Accuracy in Perturbative QCD
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• Progress on semi-leptonic $B_{(s)}$ decays
• An improved description of charm fragmentation data
• Status of $|V_{cb}|$ and $|V_{ub}|$ CKM matrix elements
• Comment on Resummation of Mass Distribution for Jets Initiated by Massive Quarks
• Heavy Flavour Jet Substructure