First observation and measurement of the branching fraction for the decay $B^0_s \to D_s^{*\mp} K^{\pm}$

TL;DR

This paper reports the first observation and measurement of the branching fraction for the decay $B^0_s o D_s^{* ull} K^{ ull}$ using LHCb data, providing new insights into B meson decay processes.

Contribution

The paper presents the first observation and precise measurement of the branching fraction for the decay $B^0_s o D_s^{* ull} K^{ ull}$, expanding knowledge of B meson decay channels.

Findings

Branching fraction of $B^0_s o D_s^{* ull} K^{ ull}$ measured as (16.3 ± 1.2 (stat) +0.7/-0.5 (syst) ± 4.8 (norm)) × 10^{-5}.

First observation of this decay channel in proton-proton collision data.

Measurement uncertainty includes statistical, systematic, and normalization channel uncertainties.

Abstract

The first observation of the $B^0_s \to D_s^{*\mp} K^{\pm}$ decay is reported using 3.0$fb^{-1}$ of proton-proton collision data collected by the LHCb experiment. The $D_s^{*\mp}$ mesons are reconstructed through the decay chain $D_s^{*\mp} \to \gamma D_s^{\mp}(K^{\mp}K^{\pm}\pi^{\mp})$. The branching fraction relative to that for $B^0_s \to D_s^{*-} \pi^{+}$ is measured to be $0.068 \pm 0.005 ^{+0.003}_{-0.002}$, where the first uncertainty is statistical and the second is systematic. Using a recent measurement of $BR(B^0_s \to D_s^{*-} \pi^{+})$ the absolute branching fraction of $B^0_s \to D_s^{*\mp} K^{\pm}$ is measured as ( 16.3 $\pm$ 1.2 (stat) $^{+0.7}_{-0.5}$ (syst) $\pm$ 4.8 (norm) ) $\times$ 10$^{-5}$, where the third uncertainty is due to the uncertainty on the branching fraction of the normalisation channel.