Semileptonic Decays of $B_s^{\ast \ast }$ mesons into $D_{s1}$ and $D_{s2}^{\ast }$ in HQET

Abstract

In the framework of the heavy quark effective theory, the leading order Isgur-Wise functions relevant to semileptonic decays of the 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 the ($D_{s1}(2536)$, $D_{s2}^{\ast }(2573)$) doublet are calculated from QCD sum rules. With these universal form factors, the decay rates and branching ratios are also estimated.

Comments: 14pages, 6 figures