### Session Y13: Bs

1:30 PM–3:18 PM, Tuesday, April 17, 2007
Hyatt Regency Jacksonville Riverfront Room: City Terrace 9

Chair: Matthew Herndon, Wisconsin University

Abstract ID: BAPS.2007.APR.Y13.9

### Abstract: Y13.00009 : Observation of the $B^0_s\to K^-\pi^+$, $\Lambda^{0}_b\to p\pi^{-}$ and $\Lambda^{0}_b\to p K^{-}$ Modes at CDF

3:06 PM–3:18 PM

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#### Author:

Guido Volpi
(University of Pisa)

We report the first observation of the charmless decays modes $B^0_s\rightarrow K^-\pi^+$, $\Lambda^{0}_b\rightarrow p\pi^{-}$, $\Lambda^{0}_b\rightarrow p K^{-}$ using 1 fb$^{-1}$ of CDF data. All three modes are expected to exhibit significant direct-$CP$~asymmetries, of which we present preliminary measurements. The new modes are separated from other larger-yield two-prong charmless modes by means of a global kinematic-PID fit, including a detailed model of QED radiation effects and non-Gaussian resolution tails.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.APR.Y13.9