Semileptonic $B_s$ decay measurements at LHCb

TL;DR

This paper reports the first measurements of semileptonic $B_s$ decays at LHCb, observing new decay structures and providing branching fraction estimates, which enhance understanding of $B_s$ decay properties.

Contribution

It presents the first observation of the $D_{s2}^{*+}$ state in $B_s$ semileptonic decays and measures related branching fractions using LHCb data.

Findings

Observation of $D_{s2}^{*+}$ in $B_s$ decays.

Measured branching fractions for $D_{s1}^+$ and $D_{s2}^{*+}$ states.

First semileptonic $B_s$ decay measurements at LHCb.

Abstract

I discuss the first semileptonic $B_s$ decay measurements performed at LHCb, and the prospects for precise studies of $B_s$ semileptonic decay properties. The analyses covered here are based on data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV. In particular the semileptonic decays $\Bs\to D_s^+ X \munu$ and $\Bs\to D^0K^+ X \munu$ are studied. Two structures are observed in the $D^0K^+$ mass spectrum at masses consistent with the known $D_{s1}(2536)^+$ and $D^*_{s2}(2573)^{+}$ mesons. The measured branching fractions relative to the total $\Bs$ semileptonic rate are ${{\cal{B}}(\Bs\to D_{s2}^{*+} X \munu)}/{{\cal{B}}(\Bs\to X \munu)}= (3.3\pm 1.0\pm 0.4)%$, and ${{\cal{B}}(\Bs\to D_{s1}^+ X \munu)}/{{\cal{B}}(\Bs\to X \munu)}= (5.4\pm 1.2({\rm stat})\pm 0.5({\rm sys}))%$. This is the first observation of the $D_{s2}^{*+}$ state in $\Bs$ decays.