Evidence for CP violation in B+ → ppK+ decays.

Journal article

Three-body B+ → ppK+ and B(+) → ppπ(+) 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(+) → ppK(+) 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 A(FB)(ppK(+),m(pp)<2.85 GeV/c(2)) = 0.495 ± 0.012 (stat) ± 0.007 (syst) and A(FB)(ppπ(+),m(pp) <2.85 GeV/c(2)) = -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(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.

Authors: Aaij, R; Adeva, B; Adinolfi, M; Affolder, A; Ajaltouni, Z

• Publication status: Published
• Publisher: American Physical Society
• Journal: Physical Review Letters
• Volume: 113
• Issue: 14
• Pages: 141801
• Publication date: 2014-10-01
• DOI: 10.1103/physrevlett.113.141801
• EISSN: 1079-7114
• ISSN: 0031-9007
• Language: English
• Keywords: LHCb Collaboration