Branching Fractions and Direct CP Asymmetries of Charmless B Decay Modes at the Tevatron

We present new CDF results on the branching fractions and time-integrated direct CP asymmetries for B0 and decay modes into pairs of charmless charged hadrons (pions or kaons). The data-set for this update amounts to 1 fb−1 of collisions at a center of mass energy 1.96 TeV. We report the first observation of the mode and a measurement of its branching fraction and direct CP asymmetry. We also observe for the first time two charmless decays of the Λb-baryon: and .