Evidence for CP violation in B+ → pp̄K+ decays
Three-body B+→p¯pK+ and B+→p¯pπ+ 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+→p¯pK+ decay is found in regions of...
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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
29 September 2014
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| In: |
Physical review letters
Year: 2014, Jahrgang: 113, Heft: 14 |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.113.141801 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.113.141801 Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.113.141801 |
| Verfasserangaben: | R. Aaij et al. (LHCb Collaboration) |
| Zusammenfassung: | Three-body B+→p¯pK+ and B+→p¯pπ+ 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+→p¯pK+ 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¯p rest frame yield AFB(p¯pK+,mp¯p<2.85 GeV/c2)=0.495±0.012 (stat)±0.007 (syst) and AFB(p¯pπ+,mp¯p<2.85 GeV/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(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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| Beschreibung: | Die + Zeichen im Titel sind hochgestellt LHCb Collaboration: R. Aaij, S. Bachmann, A. Bien, A. Comerma-Montells, M. De Cian, F. Dordei, S. Esen, C. Färber, E. Gersabeck, L. Grillo, X. Han, S. Hansmann-Menzemer, A. Jaeger, M. Kolpin, M. Kreplin, G. Krocker, B. Leverington, J. Marks, M. Meissner, M. Neuner, T. Nikodem, P. Seyfert, M. Stahl, S. Stahl, U. Uwer, M. Vesterinen, S. Wandernoth, D. Wiedner, A. Zhelezov Gesehen am 07.08.2020 |
| Beschreibung: | Online Resource |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.113.141801 |