Giovanni Punzi for the Cdf Ii Collaboration

The comparison of measurements performed on a number of such modes at ee experiments with theoretical expectations has provided a wealth of information. The CDF II experiment has access to a large yield of these decays at the Tevatron collider, thanks to a dedicated trigger on secondary decay vertices . In addition, it is also sensitive to the corresponding decays of Bs mesons and beauty baryons, which provide much additional valuable information. In particular, combining measurements of Bs modes with measurements on the Bu/Bd sector allows eliminating or constraining uncertain hadronic parameters. In this paper we report on the analysis of 2-body charmless decays of Bd, Bs and Λb in a sample of 179 ± 11 pb collected with the CDF II detector between February 2002 and September 2003.