Measurement of the Decay B_s^0 -> D_s^- pi^+ and Evidence for B_s^0 -> D_s^{+/-} K^{-/+} in e+e- Annihilation at sqrt(s)~10.87 GeV

Abstract

We have studied Bs0 -> Ds- pi+ and Bs0 -> Ds^(-/+) K^(+/-) decays using 23.6 /fb of data collected at the Upsilon(5S) resonance with the Belle detector at the KEKB e+e- collider. This highly pure Bs0 -> Ds- pi+ sample is used to measure the branching fraction, BR(Bs0 -> Ds- pi+)=[3.67 +0.35,-0.33}(stat.) +0.43,-0.42(syst.) +-0.49(f_s)] x 10^{-3} (f_s=N(Bs(*) Bs(*)bar)/N(b\bar b)) and the fractions of Bs0 event types at the Upsilon(5S) energy, {in particular N(Bs* Bs*bar}/N(N(Bs(*) Bs(*)bar)=(90.1 +3.8,-4.0 +-0.2)%. We also determine the masses M(Bs0)=(5364.4 +-1.3 +-0.7) MeV/c^2 and M(Bs*)=(5416.4 +-0.4 +-0.5) MeV/c^2. In addition, we observe Bs0 -> Ds^(-/+) K^(+/-) decays with a significance of 3.5σand measure BR(Bs0 -> Ds^(-/+) K^(+/-))=[2.4 +1.2,-1.0(stat.) +-0.3(syst.) +-0.3(f_s)] x 10^{-4}.

arXiv comment5 pages, 4 figures, accepted by PRL

References in corpus (12)

• sPlot: a statistical tool to unfold data distributions
• Kernel Estimation in High-Energy Physics
• Chiral Multiplets of Heavy-Light Mesons
• Asymptotics of Heavy-Meson Form Factors
• Observation of anomalous Upsilon(1S)pi+pi- and Upsilon(2S)pi+pi- production near the Upsilon(5S) resonance
• New Strategies to Obtain Insights into CP Violation Through $B_s\to D_s^{\pm }{K}^{\mp },D_s^{\ast \pm }{K}^{\mp },...$ and $B_d\to D^{\pm }{\pi }^{\mp },D^{\ast \pm }{\pi }^{\mp },...$ Decays
• Measurement of inclusive $D_s$, $D^0$, and $J/\psi$ rates and determination of the $B_s^{(\ast )}{\bar{B}}_s^{(\ast )}$ production fraction in $b\bar{b}$ events at the Y(5S) resonance
• Measurement of B[Y(5S)->Bs(*) anti-Bs(*)] Using phi Mesons
• First Measurements of the Exclusive Decays of the Upsilon(5S) to B Meson Final States and Improved B^*_s Mass Measurement
• Measurements of exclusive B_s^0 decays at the Y(5S) resonance
• Resolving the sign ambiguity in Delta Gamma_s with B_s -> D_s K
• Measurement of the Ratios of Branching Fractions B(Bs -> Ds pi pi pi) / B(Bd -> Dd pi pi pi) and B(Bs -> Ds pi) / B(Bd -> Dd pi)

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