Semi-inclusive studies of semileptonic $B_s$ decays at Belle

Abstract

We present an analysis of the semi-inclusive decays $B_s\to D_s^{-}X{\ell }^{+}\nu$ and $B_s\to D_s^{\ast -}X{\ell }^{+}\nu$, where $X$ denotes a final state that may consist of additional hadrons or photons and $\ell$ is an electron or muon. The studied $B_s$ decays are contained in the $121.4{\mathrm{fb}}^{-1}$ ${\rm Y}(5S)$ data sample collected by the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. The branching fractions of the decays are measured to be $\mathcal{B}(B_s\to D_s^{-}X{\ell }^{+}\nu )=[8.2\pm 0.2(\text{stat})\pm 0.6(\text{syst})\pm 1.4(\text{ext})]\%$ and $\mathcal{B}(B_s\to D_s^{\ast -}X{\ell }^{+}\nu )=[5.4\pm 0.4(\text{stat})\pm 0.4(\text{syst})\pm 0.9(\text{ext})]\%$, where the first two uncertainties are statistical and systematic and the last is due to external parameters. The measurement also provides an estimate of the $B_s^{(\ast )}{\bar{B}}_s^{(\ast )}$ production cross-section, $\sigma (e^{+}{e}^{-}\to B_s^{(\ast )}{\bar{B}}_s^{(\ast )})=(53.8\pm 1.4(\text{stat})\pm 4.0(\text{syst})\pm 3.4(\text{ext}))\mathrm{pb}$, at the center-of-mass energy $\sqrt{s}=10.86\mathrm{GeV}$.

13 pages, 2 figures, submitted to Phys. Rev. D

References in corpus (13)

• Weak decays of $B_s$ mesons to $D_s$ mesons in the relativistic quark model
• $B_s\to D_s(3040)$ form factors and $B_s$ decays into $D_s(3040)$
• Exclusive $B_s$ decays to the charmed mesons $D_s^{+}(1968,2317)$ in the standard model
• 'Bs --> Ds l nu' near zero recoil in and beyond the Standard Model
• Study on $B_s\to D_{sJ}(2317,2460)l\bar{\nu }$ Semileptonic Decays in the CQM Model
• Measurement of the B0_s semileptonic branching ratio to an orbitally excited D_s** state, Br(B0_s -> Ds1(2536) mu nu)
• QCD Sum Rules Study of the Semileptonic $B_s(B^{\pm })(B^0)\to D_s[1968](D^0)(D^{\pm })l\nu$ Decays
• Study of ${\bar{B}}_s^0\to (D_s^{+},D_s^{\ast +})l^{-}{\bar{\nu }}_l$ decays in the pQCD factorization approach
• Semileptonic $B_q\to D_q^{\ast }l\nu$ $(q=s,d,u)$ Decays in QCD Sum Rules
• Ratios of heavy hadron semileptonic decay rates
• Weak decays of ${\bar{B}}_s$ mesons
• $B_s$ Semileptonic Decays to $D_s$ and $D_s^{\ast }$ in Bethe-Salpeter Method
• Results in $B_s$ physics and bottomonium spectroscopy using the Belle ${\rm Y}(5S)$ data

Cited by in corpus (7)

• $B_s\to D_s^{\ast }$ Form Factors for the full $q^2$ range from Lattice QCD
• Observation of the decay $B_s^0\to K^0{\overline{K}}^0$
• Semileptonic and leptonic $B$ decays, circa 2016
• Measurement of the energy dependence of the $e^{+}{e}^{-}\to B\bar{B}$, $B{\bar{B}}^{\ast }$ and $B^{\ast }{\bar{B}}^{\ast }$ exclusive cross sections
• Sum rule for the partial decay rates of bottom hadrons based on the dynamical supersymmetry of the $\bar{s}$ quark and the $ud$ diquark
• Measurement of $\mathcal{B}$($B_s\to D_{s}X$) with $B_s$ Semileptonic Tagging
• Recent results from the Belle experiment