Inclusive semileptonic fits, heavy quark masses, and V_cb

TL;DR

This paper presents a comprehensive global fit to semileptonic B decay data, refining the extraction of |V_cb|, heavy quark masses, and non-perturbative parameters with NNLO corrections, impacting various B decay analyses.

Contribution

It introduces an improved global fitting method incorporating NNLO corrections and recent charm mass determinations for more precise heavy quark parameter extraction.

Findings

Extracted |V_cb| with reduced uncertainty

Determined heavy quark masses consistent with recent results

Discussed implications for rare B decay normalization and |V_ub|

Abstract

We perform global fits to the moments of semileptonic B decay distributions and extract |V_cb|, the heavy quark masses, and the non-perturbative parameters of the heavy quark expansion. We include NNLO perturbative corrections and recent determinations of the charm mass, and discuss how they improve the precision of the global fit. In particular, using the m_c determination of Ref.[11] we get m_b^kin=4.541(23) GeV and |V_cb|=(42.42+- 0.86) 10^{-3}. We also discuss the implications of the new fits for the normalization of rare B decays, the zero-recoil sum rule in B-> D* l nu, and the inclusive determination of |V_ub|.