An observation of the Λ0b→ψ(2S)Λ0 decay and a comparison of its branching fraction with that of the Λ0b→J/ψΛ0 decay has been made with the ATLAS detector in proton--proton collisions at s√=8TeV at the LHC using an integrated luminosity of 20.6fb−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 Λ0b baryons are reconstructed with transverse momentum pT>10GeV and pseudorapidity |η|<2.1. The measured branching ratio of the Λ0b→ψ(2S)Λ0 and Λ0b→J/ψΛ0 decays is Γ(Λ0b→ψ(2S)Λ0)/Γ(Λ0b→J/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 Gcyrillic(Λb 0→ψ(2S)Λ0)/G(Λb 0→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 Gcyrillic(Λb 0→ψ(2S)Λ0)/G(Λb 0→J/ψΛ0) with the ATLAS detector

AIELLI, GIULIO;CAMARRI, PAOLO;CERRITO, LUCIO;DI CIACCIO, ANNA;
2015-01-01

Abstract

An observation of the Λ0b→ψ(2S)Λ0 decay and a comparison of its branching fraction with that of the Λ0b→J/ψΛ0 decay has been made with the ATLAS detector in proton--proton collisions at s√=8TeV at the LHC using an integrated luminosity of 20.6fb−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 Λ0b baryons are reconstructed with transverse momentum pT>10GeV and pseudorapidity |η|<2.1. The measured branching ratio of the Λ0b→ψ(2S)Λ0 and Λ0b→J/ψΛ0 decays is Γ(Λ0b→ψ(2S)Λ0)/Γ(Λ0b→J/ψΛ0)=0.501±0.033(stat)±0.019(syst), lower than the expectation from the covariant quark model.
2015
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/01 - FISICA SPERIMENTALE
English
Con Impact Factor ISI
Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Aben, R., Abolins, M., et al. (2015). Measurement of the branching ratio Gcyrillic(Λb 0→ψ(2S)Λ0)/G(Λb 0→J/ψΛ0) with the ATLAS detector. PHYSICS LETTERS. SECTION B, 751, 63-80 [10.1016/j.physletb.2015.10.009].
Aad, G; Abbott, B; Abdallah, J; Abdinov, O; Aben, R; Abolins, M; Abouzeid, O; Abramowicz, H; Abreu, H; Abreu, R; Abulaiti, Y; Acharya, B; Adamczyk, L;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/162992
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