Rare radiative decays of the B_c meson

In this paper, we study the rare radiative processes B_c → D_sJ^(∗) γ within the Standard Model, where D_sJ^(∗) stands for the meson D_s^∗, D_s1 (2460, 2536) or D_s2^∗(2573). During the investigations, we consider the contributions from the penguin, annihilation, color-suppressed and color-favored cascade diagrams. Our results show that: (1) the penguin and annihilation contributions are dominant in the branching fractions; (2) for the processes B_c → D_s^∗ γ and B_c → D_s1(2460, 2536)γ, the effects from the color-suppressed and colorfavored cascade diagrams are un-negligible.