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Observation of $B_s \rightarrow \phi \phi $ decay
Text for the blessed web page - CDF note 6937

The CDF Collaboration

28 May 2004


We study the yield of various $B\rightarrow VV$ decays in the displaced track trigger of CDF II. In particular we search for evidence of the QCD penguin dominated decay of $B_s$ meson to two $\phi$, that has never been observed before, using $\approx 180 ~{\rm pb}^{-1}$ of data collected up to August 2003. Additionally we study the decay $B_s \rightarrow J/\psi \phi $ to be used as a normalization signal for the extraction of the Branching Ratio of $B_s \rightarrow \phi \phi $. We have performed a blind analysis and the procedure to fix the cuts and estimate the expected background are reported here. We have found a significant excess of events in the signal region and measure the Branching Ratio $BR(B_s \rightarrow \phi \phi )= (1.4 \pm 0.6(stat.) \pm 0.2(syst.) \pm 0.5(BR's) ) \cdot 10^{-5}$ where the last error is due to the uncertainty in the $B_s \rightarrow J/\psi \phi $ Branching Ratio.

Marco Rescigno 2004-05-28