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Measurements of direct CP-violating asymmetries in charmless decays of bottom baryons

Aaltonen, T; Amerio, S; Amidei, D; Anastassov, A; Annovi, A; Antos, J; Apollinari, G; ... CDF Collaboration; + view all (2014) Measurements of direct CP-violating asymmetries in charmless decays of bottom baryons. Physical Review Letters , 113 (24) , Article 242001. 10.1103/PhysRevLett.113.242001. Green open access

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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 √s=1.96  TeV proton-antiproton collisions data set, corresponding to 9.3  fb⁻¹ of integrated luminosity, we measure A(Λ(b)⁰→pπ⁻)=+0.06±0.07(stat)±0.03(syst) and A(Λ(b)⁰→pK⁻)=-0.10±0.08(stat)±0.04(syst), compatible with no asymmetry. In addition we measure the CP-violating asymmetries in B(s)⁰→K⁻π⁺ and B⁰→K⁺π⁻ decays to be A(B(s)⁰→K⁻π⁺)=+0.22±0.07(stat)±0.02(syst) and A(B⁰→K⁺π⁻)=-0.083±0.013(stat)±0.004(syst), respectively, which are significantly different from zero and consistent with current world averages.

Type: Article
Title: Measurements of direct CP-violating asymmetries in charmless decays of bottom baryons
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.113.242001
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.113.242001
Language: English
Additional information: Copyright © 2014 American Physical Society.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/1427264
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