Semileptonic Decays of $B^{**}_{s}$ mesons into $D_{s1}$ and $D^{*}_{s2}$ in HQET

TL;DR

This paper calculates the decay form factors, rates, and branching ratios for semileptonic decays of excited $B_s$ mesons into specific $D_s$ states using HQET and QCD sum rules.

Contribution

It provides the first calculation of Isgur-Wise functions for these decays within HQET, including new narrow $B_s$ states, using QCD sum rules.

Findings

Calculated decay rates and branching ratios for $B^{**}_s$ decays.

Provided universal form factors (Isgur-Wise functions) for these processes.

Estimated decay properties of newly observed $B_s$ states.

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 $B^{**}_{s}$, including the newly found narrow $B_{s1}(5830)$ and $B^{*}_{s2}(5840)$ states, into the ($D_{s1}(2536)$, $D^{*}_{s2}(2573)$) doublet are calculated from QCD sum rules. With these universal form factors, the decay rates and branching ratios are also estimated.