Radiative B to tensor meson decays at NLO in SCET

Abstract

The radiative $B$ to tensor $\left(K_2^*(1430),\; f_2(1270),\; a_2(1320)\right)$ meson decays are studied at next-to-leading order (NLO) in soft-collinear effective theory (SCET). The SCET allows the systematic treatment of factorizable and non-factorizable contributions along with the resummation of large perturbative logarithms. We performed a two step matching and determined the soft-overlap function $\zeta^\perp_{T}$ and branching ratios for these $B$ to tensor meson decays. In the case of $B\to K_2^*(1430)\gamma$, the numerical value of the branching ratio lies close to its experimental measurements. The estimated values of the branching ratios of CKM suppressed decays $B \to \left(a_2(1320),\; f_2(1270)\right)\gamma$ are significant small compared to that of $B\to K_2^*(1430)\gamma$, but still could be measured in some ongoing and future $B$ physics experiments.