Observation of the decay Λ b 0 → ψ(2S)pπ

The LHCb Collaboration

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The Cabibbo-suppressed decay Λb 0 → 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 Λb 0 → 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.].

Original languageEnglish
Article number131
JournalJournal of High Energy Physics
Volume2018
Issue number8
DOIs
Publication statusPublished - 1 Aug 2018

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protons
decay
mass spectra
center of mass
mesons
luminosity
collisions
energy

Keywords

  • B physics
  • Flavor physics
  • Hadron-Hadron scattering (experiments)
  • Spectroscopy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Observation of the decay Λ b 0 → ψ(2S)pπ. / The LHCb Collaboration.

In: Journal of High Energy Physics, Vol. 2018, No. 8, 131, 01.08.2018.

Research output: Contribution to journalArticle

The LHCb Collaboration. / Observation of the decay Λ b 0 → ψ(2S)pπ. In: Journal of High Energy Physics. 2018 ; Vol. 2018, No. 8.
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title = "Observation of the decay Λ b 0 → ψ(2S)pπ−",
abstract = "The Cabibbo-suppressed decay Λb 0 → 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 Λb 0 → 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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AB - The Cabibbo-suppressed decay Λb 0 → 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 Λb 0 → 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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KW - Spectroscopy

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