Measurements of Direct CP-Violating Asymmetries in Charmless Decays of Bottom Baryons

Abstract

We report final measurements of direct $CP$--violating asymmetries in charmless decays of neutral bottom hadrons to pairs of charged hadrons with the upgraded Collider Detector at the Fermilab Tevatron. Using the complete $\sqrt{s}=1.96$ TeV proton-antiproton collisions data set, corresponding to 9.3 fb${}^{-1}$ of integrated luminosity, we measure $\mathcal{A}({\Lambda }_b^0\to p{\pi }^{-})=+0.06\pm 0.07(\mathrm{stat})\pm 0.03(\mathrm{syst})$ and $\mathcal{A}({\Lambda }_b^0\to p{K}^{-})=-0.10\pm 0.08(\mathrm{stat})\pm 0.04(\mathrm{syst})$, compatible with no asymmetry. In addition we measure the $CP$--violating asymmetries in $B_s^0\to K^{-}{\pi }^{+}$ and $B^0\to K^{+}{\pi }^{-}$ decays to be $\mathcal{A}(B_s^0\to K^{-}{\pi }^{+})=+0.22\pm 0.07\mathrm{stat})\pm 0.02(\mathrm{syst})$ and $\mathcal{A}(B^0\to K^{+}{\pi }^{-})=-0.083\pm 0.013(\mathrm{stat})\pm 0.004(\mathrm{syst})$, respectively, which are significantly different from zero and consistent with current world averages.

arXiv comment8 pages, 2 figures, 1 table. Accepted by Phys.Rev.Lett

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