Observation of the Λ0b → J/ψ pπ − decay
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Abstract
The first observation of the Cabibbo-suppressed decay Λ 0b → 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 Λ 0b → J/ψpK − is determined to be
B(Λ0b→J/ψpπ−)B(Λ0b→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(Λ0b→J/ψpπ−)−ACP(Λ0b→J/ψpK−)=(+5.7±2.4 (stat)±1.2 (syst))%,
which is compatible with CP symmetry at the 2.2σ level.
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Bibliographic citation
Aaij, R., Adeva, B., Adinolfi, M. et al. Observation of the Λ0b → J/ψ pπ − decay. J. High Energ. Phys. 2014, 103 (2014). https://doi.org/10.1007/JHEP07(2014)103
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© CERN, for the benefit of the LHCb Collaboration. Article funded by SCOAP3.This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made