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Observation of the Λb0 → J/ψ pπ decay

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Original languageEnglish
Article number103
Number of pages19
Journal Journal of High Energy Physics
Volume1407
Issue number7
Early online date22 Jul 2014
DOIs
Publication statusE-pub ahead of print - 22 Jul 2014

Abstract

The first observation of the Cabibbo-suppressed decay Λ0 b → J/ψpπ− is reported using a data sample of proton-proton collisions at 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb−1 . A prominent signal is observed and the branching fraction relative to the decay mode Λ0 b → J/ψpK− is determined to be B(Λ0 b → J/ψpπ−) B(Λ0 b → J/ψpK−) = 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 be ACP (Λ0 b → J/ψpπ−) − ACP (Λ0 b → J/ψpK−) = (+5.7 ± 2.4 (stat) ± 1.2 (syst))%, which is compatible with CP symmetry at the 2.2σ level.

    Research areas

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

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