Inclusive weak decays of heavy hadrons with power suppressed terms at NLO

TL;DR

This paper provides a detailed NLO QCD calculation of power suppressed terms in inclusive heavy hadron decays, enhancing precision in extracting fundamental parameters like |V_{cb}|.

Contribution

It analytically computes the coefficient of the dimension five chromo-magnetic operator at NLO with full mass dependence, improving theoretical predictions for heavy hadron decays.

Findings

Explicit expressions for total decay widths including power corrections.

Enhanced precision in |V_{cb}| extraction from B meson decays.

Improved theoretical understanding of heavy hadron decay dynamics.

Abstract

Within the heavy quark expansion techniques for the heavy hadron weak decays we analytically compute the coefficient of the power suppressed dimension five chromo-magnetic operator at next-to-leading order of QCD perturbation theory with the full dependence on the final state quark mass. We present explicit expressions for the total width of inclusive semileptonic decays including the power suppressed terms and for a few moments of decay differential distributions. One of the important phenomenological applications of our results is precision analysis of the decays of bottom mesons to charmed final states and extraction of the numerical value for the CKM matrix entry |V_{cb}|.