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urn:hdl:2445/99322 Measurement of J/ψ production in pp collisions at √s = 7 TeV Calvo Gómez, Míriam Camboni, Alessandro Enterria i Adan, David G. d' Garrido Beltrán, Lluís Grabalosa Gándara, Marc Graciani Díaz, Ricardo Graugés Pous, Eugeni López Asamar, Elias Musy, Marco Pérez-Calero Yzquierdo, Antonio Puig Navarro, Albert Ruiz, Hugo (Ruiz Pérez) Vázquez Gómez, Ricard Vilasis-Cardona, Xavier LHCb Collaboration Hadrons Teoria quàntica de camps Gravitació Teoria quàntica Relativitat (Física) Hadrons Quantum field theory Gravitation Quantum theory Relativity (Physics) The production of J/ψ mesons in proton–proton collisions at √s = 7 TeV is studied with the LHCb detector at the LHC. The differential cross-section for prompt J/ψ production is measured as a function of the J/ψ transverse momentum pT and rapidity y in the fiducial region pT ∈ [0; 14] GeV/c and y ∈ [2.0; 4.5]. The differential cross-section and fraction of J/ψ from b-hadron decays are also measured in the same pT and y ranges. The analysis is based on a data sample corresponding to an integrated luminosity of 5.2 pb−1. The measured cross-sections integrated over the fiducial region are 10.52 ± 0.04 ± 1.40+1.64 −2.20 µb for prompt J/ψ production and 1.14 ± 0.01 ± 0.16 µb for J/ψ from b-hadron decays, where the first uncertainty is statistical and the second systematic. The prompt J/ψ production cross-section is obtained assuming no J/ψ polarisation and the third error indicates the acceptance uncertainty due to this assumption. 2016-06-07T10:53:17Z 2016-06-07T10:53:17Z 2011-05-19 2016-06-07T10:53:22Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció del document publicat a: http://dx.doi.org/10.1140/epjc/s10052-011-1645-y European Physical Journal C, 2011, vol. 71, p. 1645 http://dx.doi.org/10.1140/epjc/s10052-011-1645-y cc-by (c) LHCb Collaboration, 2011 http://creativecommons.org/licenses/by/3.0/es info:eu-repo/semantics/openAccess Società Italiana di Fisica & Springer Verlag Articles publicats en revistes (Física Quàntica i Astrofísica)