Radiative $B\to K_1$ decays in the light-cone sum rules

Abstract

The weak form factor for $B\to K_{1B}$ where $K_{1B}$ is the ${}^1{P}_1$ state is calculated in the light-cone sum rules (LCSR). Combining the quark model result for the form factor of $B\to K_{1A}$ with $K_{1A}$ being the ${}^3{P}_1$ state, we have larger values for $B\to K_1$ form factors than the previous LCSR results. The increased form factors reduce the discrepancy between theory and the experimental data for $B\to K_1\gamma$. Some phenomenological meanings are also discussed.

Comments: 15 pages, 4 figures