Measurements of exclusive $B^0_{s}$ decays at the $Y(5S)$

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^{(*)-} \pi^+, B_s^0 -> D_s^{(*)-} \rho^+, B_s^0 -> J/\psi \phi and 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 the creation of

B^*_s \bar{B}^*_s

pairs. The

B_s^0

and

B_s^*

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 -> \gamma \gamma, B_s^0 -> \phi \gamma, B_s^0 -> K^+ K^- and B_s^0 -> D_s^{(*)+} D_s^{(*)-} branching fractions are also reported.

Note:

9 pages, 5 figures, submitted to PRD Report-no: BELLE-CONF-0615

13.20.He
14.40.Gx
14.40.Nd
13.20.Gd
13.25.Gv
13.25.Hw
electron positron: colliding beams
electron positron: annihilation
Upsilon(10870): electroproduction
B/s*(5430): pair production

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Measurements of exclusive Bs0B^0_{s}Bs0​ decays at the Y(5S)Y(5S)Y(5S)

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Measurements of exclusive $B^0_{s}$ decays at the $Y(5S)$