Semileptonic b decay at intermediate recoil

Journal Article · Wed Oct 01 04:00:00 EDT 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.78.074029· OSTI ID:21254298

Dowling, Matthew; Pak, Alexey; Czarnecki, Andrzej ^[1]

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1. Department of Physics, University of Alberta, Edmonton, Alberta, T6G 2G7 (Canada)

We compute the O({alpha}{sub s}{sup 2}) corrections to the differential rate of the semileptonic decay b{yields}cl{nu}{sub l} 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{sub b,c}: m{sub c}{approx_equal}m{sub b} and m{sub c}<<m{sub 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{yields}c rate, and its earlier estimate.

• OSTI ID: 21254298
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 78; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
C QUARKS
COMPUTERIZED SIMULATION
CORRECTIONS
EXPANSION
LEPTONS
MASS
QUANTUM CHROMODYNAMICS
RECOILS
SEMILEPTONIC DECAY