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 Λb0J/ψΛ0 decays is Gcyrillic(Λb0→ψ(2S)Λ0/Gcyrillic(Λb0J/ψΛ0)=0.501±0.033(stat)±0.019(syst), lower than the expectation from the covariant quark model.

Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Aben, R., Abolins, M., et al. (2015). Measurement of the branching ratio Gamma(Λb0→ψ(2S)Λ0)/Gamma(Λb0→J/ψΛ0) with the ATLAS detector. PHYSICS LETTERS. SECTION B, 751, 63-80 [10.1016/j.physletb.2015.10.009].

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

F. Ceradini;B. Di Micco;R. Di Nardo;D. Orestano;F. Petrucci;D. Puddu;G. Salamanna;M. Sessa;C. Taccini;
2015-01-01

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 Λb0J/ψΛ0 decays is Gcyrillic(Λb0→ψ(2S)Λ0/Gcyrillic(Λb0J/ψΛ0)=0.501±0.033(stat)±0.019(syst), lower than the expectation from the covariant quark model.
2015
Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Aben, R., Abolins, M., et al. (2015). Measurement of the branching ratio Gamma(Λb0→ψ(2S)Λ0)/Gamma(Λb0→J/ψΛ0) with the ATLAS detector. PHYSICS LETTERS. SECTION B, 751, 63-80 [10.1016/j.physletb.2015.10.009].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/298491
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