The $B_c$ decay rate in the Standard Model

TL;DR

This paper introduces a new method for calculating the $B_c$ meson decay rate within the Standard Model by combining experimental data with operator product expansion, reducing theoretical uncertainties.

Contribution

The paper presents a novel approach that uses experimental data and operator product expansion to improve decay rate predictions for $B_c$ mesons.

Findings

Reduced theoretical uncertainties in $B_c$ decay rate predictions

Effective cancellation of free-quark contributions in decay rate differences

Enhanced agreement with experimental data

Abstract

The Standard Model decay rate of the $B_c$ meson is discussed together with a novel approach based on the usage of experimental data in combination with an operator product expansion. In the new method differences of $B,\,D$ and $B_c$ meson decay rates are considered, for which the free-quark contributions drop out, leading to a reduction of the theory prediction.