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Evidence of CP violation in B+→pp¯K+ decays


LHCb Collaboration; Bernet, R; Müller, K; Steinkamp, O; Straumann, U; Vollhardt, A; Serra, N; et al (2014). Evidence of CP violation in B+→pp¯K+ decays. Physical Review Letters, 113(141801):online.

Abstract

Three-body B+→pp⎯⎯K+ and B+→pp⎯⎯π+ decays are studied using a data sample corresponding to an integrated luminosity of 3.0 fb−1 collected by the LHCb experiment in proton-proton collisions at center-of-mass energies of 7 and 8 TeV. Evidence of CP violation in the B+→pp⎯⎯K+ decay is found in regions of the phase space, representing the first measurement of this kind for a final state containing baryons. Measurements of the forward-backward asymmetry of the light meson in the pp⎯⎯ rest frame yield AFB(pp⎯⎯K+, mpp⎯⎯<2.85GeV/c2)=0.495±0.012 (stat)±0.007 (syst) and AFB(pp⎯⎯π+, mpp⎯⎯<2.85GeV/c2)=−0.409±0.033 (stat)±0.006 (syst). In addition, the branching fraction of the decay B+→Λ⎯⎯⎯(1520)p is measured to be (B+→Λ⎯⎯⎯(1520)p)=(3.15±0.48 (stat)±0.07 (syst)±0.26 (BF))×10−7, where BF denotes the uncertainty on secondary branching fractions.

Abstract

Three-body B+→pp⎯⎯K+ and B+→pp⎯⎯π+ decays are studied using a data sample corresponding to an integrated luminosity of 3.0 fb−1 collected by the LHCb experiment in proton-proton collisions at center-of-mass energies of 7 and 8 TeV. Evidence of CP violation in the B+→pp⎯⎯K+ decay is found in regions of the phase space, representing the first measurement of this kind for a final state containing baryons. Measurements of the forward-backward asymmetry of the light meson in the pp⎯⎯ rest frame yield AFB(pp⎯⎯K+, mpp⎯⎯<2.85GeV/c2)=0.495±0.012 (stat)±0.007 (syst) and AFB(pp⎯⎯π+, mpp⎯⎯<2.85GeV/c2)=−0.409±0.033 (stat)±0.006 (syst). In addition, the branching fraction of the decay B+→Λ⎯⎯⎯(1520)p is measured to be (B+→Λ⎯⎯⎯(1520)p)=(3.15±0.48 (stat)±0.07 (syst)±0.26 (BF))×10−7, where BF denotes the uncertainty on secondary branching fractions.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2014
Deposited On:20 Feb 2015 16:25
Last Modified:27 Apr 2017 23:35
Publisher:American Physical Society
ISSN:0031-9007
Publisher DOI:https://doi.org/10.1103/PhysRevLett.113.141801

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