Observation of the Λ[0 over b] → J/ψ pπ[superscript −] decay
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Aaij-2014-Observation of the _.pdf
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Author(s)
Counts, Ian Thomas Hunt
Williams, Michael
Ilten, Philip J
Date Issued
July 2014
Journal
Journal of High Energy Physics
Publisher
Springer-Verlag
Citation
Aaij, R., B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, et al. “Observation of the Λ[0 over b] → J/ψ pπ[superscript −] decay.” J. High Energ. Phys. 2014, no. 7 (July 2014). © CERN, for the benefit of the LHCb Collaboration
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Final published version
Abstract
The first observation of the Cabibbo-suppressed decay Λ [0 over b] → J/ψpπ [superscript −] is reported using a data sample of proton-proton collisions at 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb[superscript −1]. A prominent signal is observed and the branching fraction relative to the decay mode Λ [0 over b] → J/ψpK [superscript −] is determined to be B(Λ[0 over b] → J/ψpπ[superscript −])/B(Λ[0 over b] → J/ψpK[superscript −]) = 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 A[subscript CP](Λ[0 over b] → J/ψpπ[superscript −]) − A[subscript CP](Λ[0 over b] → J/ψpK[superscript −]) = (+5.7 ± 2.4 (stat) ± 1.2 (syst))%, which is compatible with CP symmetry at the 2.2σ level.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1007/JHEP07(2014)103
