Inclusive |V_cb| and global fit

TL;DR

This paper reviews the theoretical framework and experimental measurements for determining |V_cb| from inclusive B decays, and performs a global fit to extract |V_cb| and the b-quark mass with high precision.

Contribution

It provides a comprehensive review of the theory and measurements for inclusive |V_cb| determination and introduces a global fit approach for simultaneous extraction of |V_cb| and m_b.

Findings

Global fit yields a precise value of |V_cb|

Determined the b-quark mass m_b from inclusive decays

Confirmed consistency between measurements and theoretical predictions

Abstract

A reliable determination of the Cabibbo-Kobayashi-Maskawa matrix element $|V_{cb}|$ is mandatory for precision flavor physics and for the search for CP violating phases from new, heavy particles. In this article, we review the theory of the determination of $|V_{cb}|$ from inclusive semileptonic $B$ decays. We discuss the available measurements of the semileptonic $B$ branching fraction and other inclusive observables in B decays relevant to the determination of $|V_{cb}|$. Finally, we perform a global fit to extract $|V_{cb}|$ and the $b$-quark mass $m_b$.