Semi-Leptonic b-decay at Intermediate Recoil
High Energy Physics - Phenomenology
2008-11-26 v2
Abstract
We compute the O(\alpha_s^2) corrections to the differential rate of the semileptonic decay b -> clv at the "intermediate recoil" point, where the c-quark mass and the invariant mass of the leptons are equal. The calculation is based on an expansion around two opposite limits of the quark masses m_{b,c}: m_c ~ m_b and m_c << m_b. The former case was previously studied; we correct and extend that result. The latter case is new. The smooth matching of both expansions provides a check of both. We clarify the discrepancy between the recent determinations of the full NNLO QCD correction to the semileptonic b -> c rate, and its earlier estimate.
Cite
@article{arxiv.0809.0491,
title = {Semi-Leptonic b-decay at Intermediate Recoil},
author = {Matthew Dowling and Alexey Pak and Andrzej Czarnecki},
journal= {arXiv preprint arXiv:0809.0491},
year = {2008}
}
Comments
9 pages, 6 figures, Replaced figures, small format and typo corrections, added appendix and references