Subleading power corrections to $B\to \gamma l\nu$ decay in PQCD approach

Yue-Long Shen, Zhi-Tian Zou, Yan-Bing Wei

The leptonic radiative decay $B\to \gamma l\nu$ is of great importance in the determination of $B$ meson wave functions, and evaluating the form factors $F_{V,A}$ are the essential probl…