QCD Sum Rule Analysis of Semileptonic $B_{s1}$, $B_{s2}^{\ast }$, $B_{s0}^{\ast }$, and $B_{s1}^{\prime }$ Decays in HQET

Abstract

We present an analysis of semileptonic decays of orbitally, $P$-wave excited $B_s$ meson states $B_s^{\ast \ast }$, including the newly found narrow $B_{s1}(5830)$ and $B_{s2}^{\ast }(5840)$ states, into low lying $D_s$ mesons ($D_s(1968)$, $D_s^{\ast }(2112)$, $D_{sJ}(2317)$, $D_{sJ}(2460)$) within the framework of heavy quark effective theory. The relevant universal form factors are estimated using QCD sum rules at the leading-order of the heavy quark expansion. The decay widths are predicted and the branching ratios are estimated.

Comments: 18 pages, 8 eps figures, revised version accepted for publication in Phys. Rev. D