Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2006-05-26
Physics
High Energy Physics
High Energy Physics - Experiment
6 pages, 5 figures, Proceedings of the Moriond Electroweak Interactions and Unified Theories conference, March 11-18, 2006, La
Scientific paper
We report results based on a 1.86 fb$^{-1}$ data sample collected on the $\Upsilon$(5S) resonance by the Belle detector at the KEKB asymmetric energy $e^+ e^-$ collider. The inclusive production of $D_s$, $D^0$ and $J/\psi$ mesons at the $\Upsilon$(5S) is studied. From the $D_s$ inclusive branching fraction the ratio $f_s = (16.4 \pm 1.4 \pm 4.1)%$ of $B_s^{(*)} \bar{B}_s^{(*)}$ to the total $b\bar{b}$ quark pair production at the $\Upsilon$(5S) energy is obtained in a model dependent way. The exclusive decays $B_s \to D_s^{(*)+} \pi^- (/\rho^-)$ and $B_s \to J/\Psi \phi (/\eta)$ are studied and a significant $B_s$ signal is observed combining these modes. The $B_s$ meson production is found to proceed predominantly through the creation of $B^*_s \bar{B}^*_s$ pairs. Upper limits on $B_s \to K^+ K^-$, $B_s \to \phi \gamma$, $B_s \to \gamma \gamma$ and $B_s \to D_s^{(*)+} D_s^{(*)-}$ decays are reported.
Drutskoy A.
for the Belle Collaboration
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