Observation of New Charmless Decays of Bottom Hadrons
Abstract
We search for new charmless decays of neutral b--hadrons to pairs of charged hadrons with the upgraded Collider Detector at the Fermilab Tevatron. Using a data sample corresponding to 1 fb-1 of integrated luminosity, we report the first observation of the decay, with a significance of 8.2σ, and measure () = (5.0 0.7 0.8)× 10-6. We also report the first observation of charmless b--baryon decays in the channels and with significances of 6.0σ and 11.5σ respectively, and we measure () = (3.5 0.6 0.9)× 10-6 and () = (5.6 0.8 1.5)× 10-6. No evidence is found for the decays and , and we set an improved upper limit () < 1.2× 10-6 at the 90% confidence level. All quoted branching fractions are measured using () as a reference.
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