Measurements of exclusive B_s^0 decays at the Y(5S) resonance

Abstract

Several exclusive $B_s^0$ decays are studied using a 1.86 fb-1 data sample collected at the Y(5S) resonance with the Belle detector at the KEKB asymmetric energy e^+ e^- collider. In the $B_s^0\to D_s^{-}{\pi }^{+}$ decay mode we find 10 $B_s^0$ candidates and measure the corresponding branching fraction. Combining the B_s^0 -> D_s^{(*)-} π^+, B_s^0 -> D_s^{(*)-} ρ^+, B_s^0 -> J/ψϕand B_s^0 -> J/ψηdecay modes, a significant $B_s^0$ signal is observed. The ratio σ(e^+ e^- -> B_s^* \bar{B}_s^*) / σ(e^+ e^- -> B_s^{(*)} \bar{B}_s^{(*)}) = (93^{+7}_{-9} \pm 1)% is obtained at the Y(5S) energy, indicating that $B_s^0$ meson production proceeds predominantly through the creation of $B_s^{\ast }{\bar{B}}_s^{\ast }$ pairs. The $B_s^0$ and $B_s^{\ast }$ meson masses are measured to be M(B_s^0)=(5370 \pm 1 \pm 3)MeV/c^2 and M(B_s^*)=(5418 \pm 1 \pm 3)MeV/c^2. Upper limits on the B_s^0 -> γγ, B_s^0 -> ϕγ, B_s^0 -> K^+ K^- and B_s^0 -> D_s^{(*)+} D_s^{(*)-} branching fractions are also reported.

9 pages, 5 figures, published in Phys. Rev. D76, 012002 (2007)

References in corpus (3)

• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• Observation of Bs->K+K- and Measurements of Branching Fractions of Charmless Two-body Decays of B0 and Bs Mesons in p-pbar Collisions at sqrt(s)=1.96 TeV
• 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

Cited by in corpus (14)

• Branching Ratio Measurements of $B_s$ Decays
• Higher mass bottomonia
• New Physics at a Super Flavor Factory
• 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
• Exploring CP Violation and Penguin Effects through $B_d^0\to D^{+}{D}^{-}$ and $B_s^0\to D_s^{+}{D}_s^{-}$
• Observation of B_s to phi gamma and Search for B_s to gamma gamma Decays at Belle
• First observation of the decay Bs --> Ds K and measurement of the ratio of branching fractions Br(Bs --> DsK)/Br(Bs --> Ds pi)
• Observation of B_s0->D_s*- pi+, B_s0->D_s(*)- rho+ Decays and Measurement of B_s0->D_s*- rho+ Polarization
• Observation of Bs->Ds(*)+Ds(*)- using e+e- collisions and a determination of the Bs-Bsbar width difference ΔΓ_s
• Search for B_{s}^{0}->hh Decays at the ${\rm Y}(5S)$ Resonance
• On Branching Ratios of $B_s$ Decays and the Search for New Physics in $B_s^0\to {\mu }^{+}{\mu }^{-}$
• Rescattering effects in B_{u,d,s}(bar) to D P, D(bar) P decays
• Radiative penguin Bs decays at Belle
• B_s decays at Belle