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

Abstract

We present new CDF results on the branching fractions and time-integrated direct CP asymmetries for $B^0$ and $B_s^0$ decay modes into pairs of charmless charged hadrons (pions or kaons). The data-set for this update amounts to 1 ${\mathrm{fb}}^{-1}$ of $p\bar{p}$ collisions at a center of mass energy 1.96 $\mathrm{TeV}$. We report the first observation of the $B_s\to K^{-}{\pi }^{+}$ mode and a measurement of its branching fraction and direct CP asymmetry. We also observe for the first time two charmless decays of the ${\Lambda }_b^0$-baryon: ${\Lambda }_b^0\to p{\pi }^{-}$ and ${\Lambda }_b^0\to p{K}^{-}$.

Submitted for the SUSY07 proceedings