$B_c^{\ast }$ meson parameters and radiative decay width within the covariant confined quark model

Abstract

In this work we tried to predict the parameters of $B_c^{\ast }$ meson. Simple assumptions gave us following parametres $m_{B_c^{\ast }}=6329\pm 10$ MeV and $f_{B_c^{\ast }}=535.5\pm 57.8$ MeV (for ${\Lambda }_{B_c^{\ast }}=2.26\pm 0.14$ GeV in covariant confined quark model). We calculated widths of radiative decays of $B_q^{\ast }$ mesons, where $q=u/d,s,c$ and compared them with other theoretical works. It was shown that the width of the $B_c^{\ast }$ meson very sensitive to the mass $m_{B_c^{\ast }}$ as expected and less to the size parameter ${\Lambda }_{B_c^{\ast }}$.