$\tau_{B_c}$ in the Standard Model

TL;DR

This paper discusses the Standard Model prediction for the $B_c$ meson lifetime, identifies key uncertainties, and proposes a new operator product expansion method that reduces theoretical uncertainties by using decay rate differences.

Contribution

It introduces a novel approach to compute the $B_c$ lifetime using decay rate differences, improving the precision of theoretical predictions.

Findings

The new method reduces uncertainties in $B_c$ lifetime calculations.

Operator product expansion applied to meson decay rates.

Potential for more accurate lifetime predictions in the Standard Model.

Abstract

The Standard Model prediction of the $B_c$ lifetime is discussed, together with the dominant uncertainties and strategies on how to improve them. Furthermore, a new method to compute the $B_c$ lifetime based on the operator product expansion is proposed. It relies on differences of $B,\,D$ and $B_c$ meson decay rates, in which the free-quark contributions cancel out, reducing the uncertainty of the theory prediction.