We report the first observation of two Cabbibo-suppressed decay
modes of the B0(s) meson. Using a sample of pp-bar collisions at s**(1/2)
1.96 TeV corresponding to 5.9 fb-1 of integrated luminosity collected
with the CDFII detector at the Fermilab Tevatron, we search for new B0(s)
decay modes in a sample of events containing J/psi to mu+ mu- decays.
We reconstruct a B0(s) to J/psi K*(892)0 signal with K*(892)0 to K+ pi+-,
observing a yield of 151 +/- 25 events with a statistical significance of
8.0 sigma. We also reconstruct a B0(s) to J/psi K0(s) signal with K0(s)
to pi++ pi+-, observing a yield of 64 +/- 14 events with a statistical
significance of 7.2 sigma. From these yields, we extract the branching
ratios B(B0(s) --> J/psi K*(892)0) ÿ8.3 +/- 3.8) x 10-5 and B(B0(s)
-> J/psi K0) ÿ3.5 +/- 0.8) x 10-5, where statistical, systematic,
and fragmentation fraction uncertainties are included in the combined
uncertainty.
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Updated: Tuesday, 2011 March 29 09:22:47 CDT automatically from input from "Carol Picciolo"