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

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

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Detalhes bibliográficos
Autores: Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Aben, R., Alconada Verzini, María Josefina, Alonso, Francisco, Arduh, Francisco Anuar, Dova, Maria Teresa, Monticelli, Fernando Gabriel, Wahlberg, Hernan Pablo, Otero y Garzon, Gustavo Javier, Piegaia, Ricardo Nestor, Reisin, Hernan Diego, Sacerdoti, Sabrina, Zieminska, D., Zimine, N. I., Zimmermann, C., Zimmermann, S., Zinonos, Z., Zinser, M., Ziolkowski, M., Živković, L., Zobernig, G., Zoccoli, A., Nedden, M. zur, Zurzolo, G., Zwalinski, L., The ATLAS Collaboration
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2015
País:Argentina
Recursos:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:inglés
OAI Identifier:oai:ri.conicet.gov.ar:11336/57171
Acesso em linha:http://hdl.handle.net/11336/57171
Access Level:acceso abierto
Palavra-chave:CERN
LHC
ATLAS
https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
Descrição
Resumo:An observation of the Λ 0 b → ψ(2S )Λ 0 decay and a comparison of its branching fraction with that of the Λ 0 b → 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 0 b baryons are reconstructed with transverse momentum pT > 10 GeV and pseudorapidity |η| < 2.1. The measured branching ratio of the Λ 0 b → ψ(2S )Λ 0 and Λ 0 b → J/ψΛ 0 decays is Γ(Λ 0 b → ψ(2S )Λ 0 )/Γ(Λ 0 b → J/ψΛ 0 ) = 0.501 ± 0.033(stat) ± 0.019(syst), lower than the expectation from the covariant quark model

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