Heavy-to-light form factors of B decays at large recoil

Abstract

The form factors of $B\to\pi(\rho)$ decays are analyzed using the light-cone sum rules in the framework of the soft-collinear effective theory (SCET). We establish the sum rules for the leading and the next-to-leading order (NLO) nonperturbative functions of the SCET. Explicit calculation shows that (leading)+(NLO) $\sim 1/E^2+1/E^3$, where $E$ is the large recoiling energy. The results are compatible with the literatures. Also the validity of this hybrid formalism is discussed.