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# Observation of decay Text for the blessed web page - CDF note 6937

The CDF Collaboration

28 May 2004

### Abstract:

We study the yield of various decays in the displaced track trigger of CDF II. In particular we search for evidence of the QCD penguin dominated decay of meson to two , that has never been observed before, using of data collected up to August 2003. Additionally we study the decay to be used as a normalization signal for the extraction of the Branching Ratio of . 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 where the last error is due to the uncertainty in the Branching Ratio.

Marco Rescigno 2004-05-28