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Taming the higher power corrections in semileptonic B decays · Around

2016

Taming the higher power corrections in semileptonic B decays

Gambino, Paolo, Healey, Kristopher J., Turczyk, Sascha

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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.

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