Evidence for CP Violation in B[superscript +] → p[bar over p]K[superscript +] Decays
Name
Aaij-2014-Evidence for CP violation.pdf
Size
495.34 KB
Format
Adobe PDF
Checksum (MD5)
3c25583bb4c7103c7e8ec60dd82b3388
Author(s)
Counts, Ian Thomas Hunt
Williams, Michael
Ilten, Philip J
Date Issued
September 2014
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaij, R., B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, et al. “Evidence for CP Violation in B[superscript +] → p[bar over p]K[superscript +] Decays.” Physical Review Letters 113, no. 14 (September 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[superscript +] decays are studied using a data sample corresponding to an integrated luminosity of 3.0 fb[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]] < 2.85 GeV/c[superscript 2]) = 0.495 ± 0.012 (stat) ± 0.007 (syst) and A[subscript FB](p[bar over p]π[superscript +], m[subscript p[bar over p]] < 2.85 GeV/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
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevLett.113.141801
