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

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

doi:10.1016/j.physletb.2015.10.009

Artículo

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

Fecha de publicación: 12/2015

Editorial: Elsevier Science

Revista: Physics Letters B

ISSN: 0370-2693

Idioma: Inglés

Tipo de recurso: Artículo publicado

Clasificación temática:

Astronomía

Resumen

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

Palabras clave: Cern , Lhc , Atlas

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Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)

Identificadores

URI: http://hdl.handle.net/11336/57171

DOI: http://dx.doi.org/10.1016/j.physletb.2015.10.009

URL: https://www.sciencedirect.com/science/article/pii/S0370269315007601?via%3Dihub

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Articulos(IFLP)
Articulos de INST.DE FISICA LA PLATA

Citación

Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O.; Aben, R.; et al.; Measurement of the branching ratio Γ(Λ 0 b → ψ(2S)Λ 0 )/Γ(Λ 0 b → J/ψΛ 0 ) with the ATLAS detector; Elsevier Science; Physics Letters B; 751; 12-2015; 63-80

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