Observation of the decay Λ <inf>b</inf><sup>0</sup> → ψ(2S)pπ<sup>−</sup>

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sword-2021-04-30T11:55:40.original.xml (130 B)
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Date Issued
August 1, 2018
Journal
Journal of High Energy Physics
Version
Final published version
Abstract
© 2018, The Author(s). The Cabibbo-suppressed decay Λb0 → ψ(2S)pπ− is observed for the first time using a data sample collected by the LHCb experiment in proton-proton collisions corresponding to 1.0, 2.0 and 1.9 fb−1 of integrated luminosity at centre-of-mass energies of 7, 8 and 13 TeV, respectively. The ψ(2S) mesons are reconstructed in the μ+μ− final state. The branching fraction with respect to that of the Λb0 → ψ(2S)pK− decay mode is measured to be ℬ(Λb0→ψ(2S)pπ−)ℬ(Λb0→ψ(2S)pK−)=(11.4±1.3±0.2)%, where the first uncertainty is statistical and the second is systematic. The ψ(2S)p and ψ(2S)π− mass spectra are investigated and no evidence for exotic resonances is found.[Figure not available: see fulltext.].
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DOI of Published Version
10.1007/JHEP08(2018)131
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