Evidence for CP Violation in B[superscript +] → p[bar over p]K[superscript +] Decays
Name
PhysRevLett.113.141801.pdf
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539.25 KB
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Author(s)
Counts, Ian Thomas Hunt
Ilten, Philip J
Williams, Michael
Date Issued
September 2014
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Aaij, R., et al. “Evidence for C P Violation in B[superscript +] → p[bar over p]K[superscript +] Decays.” Physical Review Letters, vol. 113, no. 14, Sept. 2014. © 2014 CERN, for the LHCb Collaboration.
Version
Final published version
Abstract
Three-body B[superscript +] → p[bar over p]K[superscript +] and B[superscript +] → p[bar over p]π[supersscript +] decays are studied using a data sample corresponding to an integrated luminosity of 3.0fb[superscript -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[superscript +] → p[bar over p]K[superscript +] 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 p[bar over p] rest frame yield A[subscript FB](p[bar over p]K[superscript +],m[subscript p[bar over p]] < 2.85GeV/c[superscript 2]) = 0.495±0.012(stat)±0.007(syst) and AFB(p[bar over p]π[superscript +],m[subscript p[bar orver p]] < 2.85GeV/c[superscript 2]) = -0.409±0.033(stat)±0.006(syst). In addition, the branching fraction of the decay B[superscript +] → [bar over Λ] (1520)p is measured to be B(B[superscript +] → [bar over Λ](1520)p)=(3.15±0.48(stat)±0.07(syst)±0.26(BF))×10[superscript -7], where BF denotes the uncertainty on secondary branching fractions.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PHYSREVLETT.113.141801
