B -> X_u l nu decay distributions to order alpha_s

Details B -> X_u l nu decay distributions to order alpha_s B -> X_u l nu decay distributions to order alpha_s

1999-05-14

arxiv.org/abs/hep-ph/9905351v2

JHEP 9906:017,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

24 pages, 11 figures, 1 typo in eq.(5.4) corrected; version published in JHEP06(1999)017

Scientific paper

An analytic result for the O(alpha_s corrections to the triple differential B -> X_u l nu decay rate is presented, to leading order in the heavy-quark expansion. This is relevant for computing partially integrated decay distributions with arbitrary cuts on kinematic variables. Several double and single differential distributions are derived, most of which generalize known results. In particular, an analytic result for the O(alpha_s) corrections to the hadronic invariant mass spectrum is presented. The effects of Fermi motion, which are important for the description of decay spectra close to infrared sensitive regions, are included. The behaviour of perturbation theory in the region of time-like momenta is also investigated

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