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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| Formato: | JOUR |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_03702693_v751_n_p63_Aad |
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| Sumario: | 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 |
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