Taming the higher power corrections in semileptonic B decays

Abstract

We study the effect of dimension 7 and 8 operators on inclusive semileptonic B decays and the extraction of |Vcb|. Using moments of semileptonic B decay spectra and information based on the Lowest-Lying State saturation Approximation (LLSA) we perform a global fit of the nonperturbative parameters of the heavy quark expansion including for the first time the O(1/mb^{4,5}) contributions. Higher power corrections appear to have a very small effect on the extraction of |Vcb|, independently of the weight we attribute to the LLSA.

6 pages, 3 figures, small changes to match accepted publication in PLB

References in corpus (7)

• Big-Bang Nucleosynthesis
• Precision determination of the CKM element Vcb
• Mass effects in muon and semileptonic b -> c decays
• Can the differences in the determinations of $V_{ub}$ and $V_{cb}$ be explained by New Physics?
• Single Intermediate Vector Boson production in e+e- collisions at sqrt(s) = 183 - 209 GeV
• Improved Estimates for the Parameters of the Heavy Quark Expansion
• Role of "Intrinsic Charm" in Semi-Leptonic B-Meson Decays

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