QCD Sum Rule Analysis of Semileptonic $B_{s1}$, $B^{*}_{s2}$, $B^{*}_{s0}$, and $B'_{s1}$ Decays in HQET

TL;DR

This paper analyzes semileptonic decays of excited $B_s$ mesons into $D_s$ mesons using QCD sum rules within heavy quark effective theory, predicting decay widths and branching ratios.

Contribution

It provides the first QCD sum rule estimates of form factors for semileptonic $B_s^{**}$ decays into $D_s$ mesons within HQET.

Findings

Predicted decay widths for $B_s^{**}$ semileptonic decays.

Estimated branching ratios for these decay channels.

Identified the role of universal form factors in decay processes.

Abstract

We present an analysis of semileptonic decays of orbitally, $P$-wave excited $B_{s}$ meson states $B^{**}_{s}$, including the newly found narrow $B_{s1}(5830)$ and $B^{*}_{s2}(5840)$ states, into low lying $D_{s}$ mesons ($D_{s}(1968)$, $D^{*}_{s}(2112)$, $D_{sJ}(2317)$, $D_{sJ}(2460)$) 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.