Form factors ofBu,d,sdecays intop-wave axial-vector mesons in the light-cone sum rule approach

Abstract

We calculate the vector and axial-vector form factors of ${B}_{u,d,s}$ decays into $P$-wave axial-vector mesons in the light-cone sum rule approach. For the sum rule results, we have included corrections of order ${m}_{A}/{m}_{b}$, where ${m}_{A}$ is the mass of the axial-vector meson $A$. The results are relevant to the light-cone distribution amplitudes of the axial-vector mesons. It is important to note that, owing to the $G$ parity, the chiral-even two-parton light-cone distribution amplitudes of the $^{3}P_{1}$ ($^{1}P_{1}$) mesons are symmetric (antisymmetric) under the exchange of quark and antiquark momentum fractions in the SU(3) limit. For chiral-odd light-cone distribution amplitudes, it is the other way around. The predictions for decay rates of ${B}_{u,d,s}\ensuremath{\rightarrow}Ae{\ensuremath{\nu}}_{e}$ are also presented.