Branching fractions and direct CP asymmetries of charmless decay modes at the Tevatron

TL;DR

This paper reports new measurements of branching fractions and CP asymmetries in charmless B meson decays at the Tevatron, including the first observation of certain decay modes and CP asymmetries.

Contribution

It provides the first observation of the $B^{0}_{s} o K^{-} ext{ } ext{ extbackslash} ext{ extbackslash}pi^{+}$ decay and two charmless $b$-baryon decays, with measurements of their properties.

Findings

First observation of $B^{0}_{s} o K^{-} ext{ extbackslash} ext{ extbackslash}pi^{+}$ decay

Observation of $ ext{ extbackslash}Lambda^{0}_{b} o p ext{ extbackslash} ext{ extbackslash}pi^{-}$ and $ ext{ extbackslash}Lambda^{0}_{b} o pK^{-}$ decays

Measurements of branching fractions and CP asymmetries for these modes

Abstract

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