Measurement of the branching ratio Γ(Λb 0→ψ(2S)Λ0)/Γ(Λb 0→J/ψΛ0) with the ATLAS detector

ATLAS Collaboration

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

An observation of the Λb 0→ψ(2S)Λ0 decay and a comparison of its branching fraction with that of the Λb 0→J/ψΛ0 decay has been made with the ATLAS detector in proton–proton collisions at s=8 TeV at the LHC using an integrated luminosity of 20.6 fb−1. The J/ψ and ψ(2S) mesons are reconstructed in their decays to a muon pair, while the Λ0→pπ decay is exploited for the Λ0 baryon reconstruction. The Λb 0 baryons are reconstructed with transverse momentum pT>10 GeV and pseudorapidity |η|<2.1. The measured branching ratio of the Λb 0→ψ(2S)Λ0 and Λb 0→J/ψΛ0 decays is Γ(Λb 0→ψ(2S)Λ0)/Γ(Λb 0→J/ψΛ0)=0.501±0.033(stat)±0.019(syst), lower than the expectation from the covariant quark model.

Original languageEnglish
Pages (from-to)63-80
Number of pages18
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume751
DOIs
Publication statusPublished - 2015 Dec 17
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Fingerprint Dive into the research topics of 'Measurement of the branching ratio Γ(Λ<sub>b</sub> <sup>0</sup>→ψ(2S)Λ<sup>0</sup>)/Γ(Λ<sub>b</sub> <sup>0</sup>→J/ψΛ<sup>0</sup>) with the ATLAS detector'. Together they form a unique fingerprint.

  • Cite this