${\tau }_{B_c}$ 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.

Comments: 7 pages, 1 figure, Contribution to the proceedings of the Corfu Summer Institute 2021 "School and Workshops on Elementary Particle Physics and Gravity", 29 August - 9 October 2021, Corfu, Greece