Measurement of the branching ratio Γ(Λb0→ψ(2S)Λ0)/Γ(Λb0→J/ψΛ0) with the ATLAS detector

, The ATLAS collaboration (2015) Measurement of the branching ratio Γ(Λb0→ψ(2S)Λ0)/Γ(Λb0→J/ψΛ0) with the ATLAS detector. Physics Letters B, 751. pp. 63-80. ISSN 0370-2693

[img]
Preview
PDF (1-s2.0-S0370269315007601-main)
1_s2.0_S0370269315007601_main.pdf - Published Version
Available under License Creative Commons Attribution.

Download (1MB)

Abstract

An observation of the Λb0→ψ(2S)Λ0 decay and a comparison of its branching fraction with that of the Λb0→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 Λb0 baryons are reconstructed with transverse momentum pT>10 GeV and pseudorapidity |η|<2.1 . The measured branching ratio of the Λb0→ψ(2S)Λ0 and Λb0→J/ψΛ0 decays is Γ(Λb0→ψ(2S)Λ0)/Γ(Λb0→J/ψΛ0)=0.501±0.033(stat)±0.019(syst) , lower than the expectation from the covariant quark model.

Item Type:
Journal Article
Journal or Publication Title:
Physics Letters B
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
ID Code:
78059
Deposited By:
Deposited On:
29 Jan 2016 11:20
Refereed?:
Yes
Published?:
Published
Last Modified:
25 Nov 2020 03:28