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Several exclusive $B_s^0$ decays are studied using a 1.86 fb-1 data samplecollected at the Y(5S) resonance with the Belle detector at the KEKB asymmetricenergy 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. Combiningthe B_s^0 -> D_s^{(*)-} \pi^+, B_s^0 -> D_s^{(*)-} \rho^+, B_s^0 -> J/\psi \phiand B_s^0 -> J/\psi \eta decay modes, a significant $B_s^0$ signal is observed.The ratio \sigma (e^+ e^- -> B_s^* \bar{B}_s^*) / \sigma (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 thecreation of $B^*_s \bar{B}^*_s$ pairs. The $B_s^0$ and $B_s^*$ meson masses aremeasured to be M(B_s^0)=(5370 \pm 1 \pm 3)MeV/c^2 and M(B_s^*)=(5418 \pm 1 \pm3)MeV/c^2. Upper limits on the B_s^0 -> \gamma \gamma, B_s^0 -> \phi \gamma,B_s^0 -> K^+ K^- and B_s^0 -> D_s^{(*)+} D_s^{(*)-} branching fractions arealso reported.Comment: 9 pages, 5 figures, published in Phys. Rev. D76, 012002 (2007

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

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Measurements of exclusiveBs0decays at theΥ(5S)resonance