Measurement of the branching ratio Γ(Λ b 0 →ψ(2S)Λ 0 )/Γ(Λ b 0 →J/ψΛ 0 ) with the ATLAS detector

An observation of the Λ b 0 →ψ(2S)Λ 0 decay and a comparison of its branching fraction with that of the Λ b 0 →J/ψΛ 0 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 reconstructe...

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Autor principal: Aad, G.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_03702693_v751_n_p63_Aad
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_03702693_v751_n_p63_Aad2023-10-03T15:29:41Z Measurement of the branching ratio Γ(Λ b 0 →ψ(2S)Λ 0 )/Γ(Λ b 0 →J/ψΛ 0 ) with the ATLAS detector Aad, G. An observation of the Λ b 0 →ψ(2S)Λ 0 decay and a comparison of its branching fraction with that of the Λ b 0 →J/ψΛ 0 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 Λ 0 →pπ − decay is exploited for the Λ 0 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)Λ 0 and Λ b 0 →J/ψΛ 0 decays is Γ(Λ b 0 →ψ(2S)Λ 0 )/Γ(Λ b 0 →J/ψΛ 0 )=0.501±0.033(stat)±0.019(syst), lower than the expectation from the covariant quark model. © 2015 CERN for the benefit of the ATLAS Collaboration JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03702693_v751_n_p63_Aad
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description An observation of the Λ b 0 →ψ(2S)Λ 0 decay and a comparison of its branching fraction with that of the Λ b 0 →J/ψΛ 0 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 Λ 0 →pπ − decay is exploited for the Λ 0 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)Λ 0 and Λ b 0 →J/ψΛ 0 decays is Γ(Λ b 0 →ψ(2S)Λ 0 )/Γ(Λ b 0 →J/ψΛ 0 )=0.501±0.033(stat)±0.019(syst), lower than the expectation from the covariant quark model. © 2015 CERN for the benefit of the ATLAS Collaboration
format JOUR
author Aad, G.
spellingShingle Aad, G.
Measurement of the branching ratio Γ(Λ b 0 →ψ(2S)Λ 0 )/Γ(Λ b 0 →J/ψΛ 0 ) with the ATLAS detector
author_facet Aad, G.
author_sort Aad, G.
title Measurement of the branching ratio Γ(Λ b 0 →ψ(2S)Λ 0 )/Γ(Λ b 0 →J/ψΛ 0 ) with the ATLAS detector
title_short Measurement of the branching ratio Γ(Λ b 0 →ψ(2S)Λ 0 )/Γ(Λ b 0 →J/ψΛ 0 ) with the ATLAS detector
title_full Measurement of the branching ratio Γ(Λ b 0 →ψ(2S)Λ 0 )/Γ(Λ b 0 →J/ψΛ 0 ) with the ATLAS detector
title_fullStr Measurement of the branching ratio Γ(Λ b 0 →ψ(2S)Λ 0 )/Γ(Λ b 0 →J/ψΛ 0 ) with the ATLAS detector
title_full_unstemmed Measurement of the branching ratio Γ(Λ b 0 →ψ(2S)Λ 0 )/Γ(Λ b 0 →J/ψΛ 0 ) with the ATLAS detector
title_sort measurement of the branching ratio γ(λ b 0 →ψ(2s)λ 0 )/γ(λ b 0 →j/ψλ 0 ) with the atlas detector
url http://hdl.handle.net/20.500.12110/paper_03702693_v751_n_p63_Aad
work_keys_str_mv AT aadg measurementofthebranchingratioglb0ps2sl0glb0jpsl0withtheatlasdetector
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