The 2009 Europhysics Conference on High Energy Physics

Jul 16 – 22, 2009
Kraków, Poland
Europe/Warsaw timezone

Bs decays at Belle

Jul 16, 2009, 2:30 PM
20m
Large Lecture - Hall A (Kraków, Poland)

Large Lecture - Hall A

Kraków, Poland

The Auditorium Maximum of the Jagiellonian University 33 Krupnicza Street 31-123 Kraków
Flavour Physics

Speaker

Remi Louvot (École Polytechnique Fédérale de Lausanne (EPFL))

Description

Observation of $B_s \to J/\psi \eta$ and Search for $B_s \to J/\psi \eta'$ We report the first observation of the $CP$ eigenstate decay $B_s \to J/\psi \eta$ and a search for the decay $B_s \to J/\psi \eta'$. The results are based on 23.6~fb$^{-1}$ of data collected at the $\Upsilon(5S)$ resonance with the Belle detector at the KEKB asymmetric $e^+ e^-$ collider. Search for $B_{s} \to hh$ decays We present a study of $B_{s} \to h h$ decays, where $h$ stands for charged or neutral $K$ or $\pi$. These results are obtained from a data sample collected on the $\Upsilon(5S)$ resonance with the Belle detector at the KEKB asymmetric energy $e^+ e^-$ collider. Measurement of ${\cal B}(B_s \to D_s^{(*)+}D_s^{(*)-})$ and Estimate of $\Delta \Gamma_{CP}$ We report a measurement of the branching fractions for the decays $B_s \to D_s^{(*)+}D_s^{(*)-}$ using a large data sample collected at the $\Upsilon(5S)$ resonance with the Belle detector at the KEKB asymmetric energy $e^+ e^-$ collider. In the heavy quark limit, this branching fraction is directly related to the width difference between the $CP$-odd and $CP$-even $B_s$ states. Observation of $B_s\to D_s^{*-}\pi^+$ and $B_s\to D_s^{(*)-} \rho^+$ at Belle The large data sample being recorded with the Belle detector at the $\Upsilon$(5S) energy provides a unique opportunity to study the poorly-known $B_s$ meson. Following our recent measurement of $B_s \to D_s\pi$ in a sample of 23.6~fb$^{-1}$, we extend the analysis to include decays with photons in the final state. Using the same sample, we report the first observation of three other exclusive $B_s$ decays with large branching fractions, $B_s\to D_s^{*-}\pi^+$, $B_s \to D_s^{-}\rho^+$ and $B_s \to D_s^{*-}\rho^+$ . Search for Baryonic Decays of $B_s$ We report results from a study of $B_s^0$ meson baryonic decays at Belle. We search for $\bar B_s^0 \to \Lambda_c^+ \pi^- \bar \Lambda$, $\bar B_s^0 \to p K^- \bar\Lambda$, $\bar B_s^0 \to \Sigma_c^0 \bar{p} K^+$, and $\bar B_s^0 \to \Lambda_c^+ \pi^- \bar{p} K^+$ modes. The analysis is performed using a large sample of data at the $\Upsilon$(5S) energy collected with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider.

Primary author

Remi Louvot (École Polytechnique Fédérale de Lausanne (EPFL))

 Slides