Exclusive $c \to u \gamma$ transitions of $B_c$ meson

TL;DR

This paper investigates rare $B_c$ meson decays via the $c o u \gamma$ transition, which are suppressed in the Standard Model and sensitive to new physics, focusing on long-distance effects in radiative transitions.

Contribution

It provides an analysis of long-distance contributions in $B_c$ radiative decays to $B^*$ and $B_1^{\

Findings

Long-distance effects are significant in $B_c$ radiative decays.

The study offers insights into potential new physics signals.

It advances understanding of flavor-changing neutral current processes.

Abstract

We study the rare decays of the $B_c$ meson induced by the flavour changing neutral current $c \to u \gamma$ transition. In the Standard Model they are strongly suppressed by the Glashow-Iliopoulos-Maiani mechanism, therefore they are sensitive to new physics. The difficulty is to get rid of long-distance contributions. We study such effects in radiative $B_c$ transitions both to $B^*$ and to the axial-vector $B_1^{\prime}$ meson.