Observation of the Lambda(0)(b) -> J/psi p pi(-) decay

LHCb collaboration

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The first observation of the Cabibbo-suppressed decay Lambda(0)(b) -> J / psi p pi(-) is reported using a data sample of proton-proton collisions at 7 and 8TeV, corresponding to an integrated luminosity of 3 fb(-1). A prominent signal is observed and the branching fraction relative to the decay mode Lambda(0)(b) -> J / psi pK(-) is determined to beB(Lambda(0)(b) -> J / psi p pi(-))/ B(Lambda(0)(b) -> J / psi pK(-)) = 0.0824 +/- 0.0025 (stat) +/- 0.0042 (syst).A search for direct CP violation is performed. The difference in the CP asymmetries between these two decays is found to beACP(Lambda(0)(b) -> J / psi p pi(-))/ A(CP)(Lambda(0)(b) -> J / psi pK(-)) = (+5.7 +/- 2.4 (stat) +/- 1.2 (syst))%,which is compatible with CP symmetry at the 2.2 sigma level.
Original languageEnglish
Article number103
Number of pages19
JournalJournal of High Energy Physics
Issue number7
Publication statusPublished - 22 Jul 2014
Externally publishedYes


  • B physics
  • CP violation
  • Branching fraction
  • Flavor physics
  • Hadron-Hadron Scattering
  • TOOL

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