Two-loop QCD Corrections to Semileptonic {ital b} Decays at Maximal Recoil

Journal Article · Thu May 01 04:00:00 EDT 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.78.3630· OSTI ID:496824

Czarnecki, A; Melnikov, K ^[1]

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1. Institut fuer Theoretische Teilchenphysik, Universitaet Karlsruhe, D-76128 Karlsruhe (Germany)

We present a complete O({alpha}{sup 2}{sub s}) correction to the differential width of the inclusive semileptonic decay b{r_arrow}cl{nu}{sub l} at the kinematical point of vanishing invariant mass of the leptons, q{sup 2}=0. Together with the recently computed O({alpha}{sup 2}{sub s}) correction at the upper boundary of the lepton invariant mass spectrum, this new information permits an estimate of the O({alpha}{sup 2}{sub s}) effect in the total inclusive semileptonic decay width b{r_arrow}cl{nu}{sub l}. We argue that the non{endash}Brodsky-Lepage-Mackenzie (BLM) part of the O({alpha}{sup 2}{sub s}) correction gives at most 1{percent} correction to the inclusive semileptonic decay width b{r_arrow}cl{nu}{sub l}. This significantly improves the credibility of extracting {vert_bar}V{sub cb}{vert_bar} from the inclusive semileptonic decays of the b hadrons. {copyright} {ital 1997} {ital The American Physical Society }

• OSTI ID: 496824
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 19 Vol. 78; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
B QUARKS
CORRECTIONS
INCLUSIVE INTERACTIONS
MASS SPECTRA
QUANTUM CHROMODYNAMICS
SEMILEPTONIC DECAY