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

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dc.contributor.VIAF250674117 (Izen, JM)en_US
dc.contributor.VIAF250674117 (Izen, JM)
dc.contributor.authorAad, G.en_US
dc.contributor.authorAbbott, B.en_US
dc.contributor.authorAbdallah, J.en_US
dc.contributor.authorAbdinov, O.en_US
dc.contributor.authorAben, R.en_US
dc.contributor.authorAbolins, M.en_US
dc.contributor.authorAbouZeid, O. S.en_US
dc.contributor.authorIzen, Joseph M.en_US
dc.contributor.authorLeyton, Michaelen_US
dc.contributor.authorMeirose, Bernharden_US
dc.contributor.authorNamasivayam, Harisankaren_US
dc.contributor.authorReeves, Kendallen_US
dc.contributor.authorATLAS Collaborationen_US
dc.contributor.utdAuthorIzen, Joseph M.en_US
dc.contributor.utdAuthorLeyton, Michaelen_US
dc.contributor.utdAuthorMeirose, Bernharden_US
dc.contributor.utdAuthorNamasivayam, Harisankaren_US
dc.contributor.utdAuthorReeves, Kendallen_US
dc.date.accessioned2016-07-06T18:59:54Z
dc.date.available2016-07-06T18:59:54Z
dc.date.created2015-12en_US
dc.date.issued2015-12en_US
dc.description.abstractAn 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.en_US
dc.identifier.bibliographicCitationAad, 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.en_US
dc.identifier.issn0370-2693en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/4881
dc.identifier.volume751en_US
dc.language.isoenen_US
dc.publisherElsevier Science BVen_US
dc.relation.urihttp://dx.doi.org/10.1016/j.physletb.2015.10.009
dc.rightsCC BY 4.0 (Attribution)en_US
dc.rights©2015 CERN, for the ATLAS Collaborationen_US
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en_US
dc.sourcePhysics Letters B
dc.subjectProton-proton interactionsen_US
dc.subjectLambda particlesen_US
dc.subjectBaryonsen_US
dc.subjectJ/ψ (J/psi) mesonen_US
dc.titleMeasurement of the Branching Ratio Γ ({Λ_b⁰} → ψ(2s)Λ⁰) / Γ ({Λ_b⁰} → J/ψΛ⁰) with the ATLAS Detectoren_US
dc.type.genreArticleen_US

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Izen, Joseph M.
NSM Staff-Student Research