# 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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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics Physical Sciences > General Physics and Astronomy English 2014 20 Feb 2015 16:25 30 Jul 2020 17:12 American Physical Society 0031-9007 Hybrid https://doi.org/10.1103/PhysRevLett.113.141801

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