Observation of the decay Λ0b → ψ(2S)pπ

LHCb Collaboration

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The Cabibbo-suppressed decay Λ0b → 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 fb1 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 Λ0b → ψ(2S)pK decay mode is measured to be B B( ( ΛΛ0b0bψψ(2S)pK(2S)pπ− ) ) = (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.

Original languageEnglish (US)
JournalUnknown Journal
StatePublished - Jun 21 2018

ASJC Scopus subject areas

  • General

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