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

Abstract

The first observation of the $B_s^0\to D_s^{\ast \mp }{K}^{\pm }$ decay is reported using 3.0$f{b}^{-1}$ of proton-proton collision data collected by the LHCb experiment. The $D_s^{\ast \mp }$ mesons are reconstructed through the decay chain $D_s^{\ast \mp }\to \gamma D_s^{\mp }(K^{\mp }{K}^{\pm }{\pi }^{\mp })$. The branching fraction relative to that for $B_s^0\to D_s^{\ast -}{\pi }^{+}$ is measured to be $0.068\pm 0.005_{-0.002}^{+0.003}$, where the first uncertainty is statistical and the second is systematic. Using a recent measurement of $BR(B_s^0\to D_s^{\ast -}{\pi }^{+})$ the absolute branching fraction of $B_s^0\to D_s^{\ast \mp }{K}^{\pm }$ is measured as ( 16.3 $\pm$ 1.2 (stat) ${}_{-0.5}^{+0.7}$ (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.

17 pages, 4 figures

References in corpus (6)

• PYTHIA 6.4 Physics and Manual
• Big-Bang Nucleosynthesis
• The $B(B_s)\to D_{(s)}P$, $D_{(s)}V$, $D_{(s)}^{\ast }P$ and $D_{(s)}^{\ast }V$ decays in the perturbative QCD approach
• Weak decays of $B_s$ mesons to $D_s$ mesons in the relativistic quark model
• Exploring $B_s\to D_s^{(\ast )\pm }{K}^{\mp }$ Decays in the Presence of a Sizable Width Difference $\Delta {\Gamma }_s$
• Determination of the branching fractions of $B_s^0\to D_s^{\mp }{K}^{\pm }$ and $B^0\to D_s^{-}{K}^{+}$

Cited by in corpus (10)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2018
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
• Two-body non-leptonic heavy-to-heavy decays at NNLO in QCD factorization
• Analysis of Two-body Charmed $B$ Meson Decays in Factorization-Assisted Topological-Amplitude Approach
• Cuscuton gravity as a classically stable limiting curvature theory
• CP violation in the B system
• Different models of gravitating Dirac fermions in optical lattices
• STU Black Holes and SgrA*
• Sum rule for the partial decay rates of bottom hadrons based on the dynamical supersymmetry of the $\bar{s}$ quark and the $ud$ diquark