Measurement of the Branching Ratio Γ ({Λ_b⁰} → ψ(2s)Λ⁰) / Γ ({Λ_b⁰} → J/ψΛ⁰) with the ATLAS Detector

DSpace/Manakin Repository

Measurement of the Branching Ratio Γ ({Λ_b⁰} → ψ(2s)Λ⁰) / Γ ({Λ_b⁰} → J/ψΛ⁰) with the ATLAS Detector

Show full item record

Title: Measurement of the Branching Ratio Γ ({Λ_b⁰} → ψ(2s)Λ⁰) / Γ ({Λ_b⁰} → J/ψΛ⁰) with the ATLAS Detector
Author(s):
Aad, G.;
Abbott, B.;
Abdallah, J.;
Abdinov, O.;
Aben, R.;
Abolins, M.;
AbouZeid, O. S.;
Izen, Joseph M.;
Leyton, Michael;
Meirose, Bernhard;
Namasivayam, Harisankar;
Reeves, Kendall;
ATLAS Collaboration
Date Created: 2015-12
Item Type: Article
Keywords: Proton-proton interactions
Lambda particles
Baryons
J/ψ (J/psi) meson
Abstract: An observation of the Γ_b^{Λ0} > ψ(2s)Λ⁰ decay and a comparison of its branching fraction with that of the Λ_b^0 > ψ(2s)Λ⁰ decay has been made with the ATLAS detector in proton-proton collisions at √s̅ = 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 Λ_b^0 baryons are reconstructed with transverse momentum p_T > 10 GeV and pseudorapidity |η| < 2.1. The measured branching ratio of the Λ_b^0 → ψ(2s)Λ⁰ and Λ_b^0 and Λ_b^0 → J/ψΛ⁰ decay is Γ(Λ_b^0 / Γ(Λ_b^0 → J/ψΛ⁰) = 0.501 ± 0.033(stat) ± 0.019(syst), lower than the expectation from the covariant quark model.
Publisher: Elsevier Science BV
ISSN: 0370-2693
Source: Physics Letters B
Link to Related Resource: http://dx.doi.org/10.1016/j.physletb.2015.10.009
Persistent Link: http://hdl.handle.net/10735.1/4881
Bibliographic Citation: Aad, G., B. Abbott, J. Abdallah, O. Abdinov, et al. 2015. "Measurement of the branching ratio Γ ({Λ_b⁰} → ψ(2s)Λ⁰) / Γ ({Λ_b⁰} → J/ψΛ⁰) with the ATLAS detector." Physics Letters B 751, doi: 10.1016/j.physletb.2015.10.009.
Terms of Use: CC BY 4.0 (Attribution)
©2015 CERN, for the ATLAS Collaboration

Files in this item

Files Size Format View
NSM-2307-273944.64.pdf 1.378Mb PDF View/Open Article
NSM-2307-273944.64T.png 8.233Kb PNG image Thumbnail Title

This item appears in the following Collection(s)


Show full item record

CC BY 4.0 (Attribution) Except where otherwise noted, this item's license is described as CC BY 4.0 (Attribution)