2026-04-17T03:21:14Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/993222025-12-05T16:53:15Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917

00925njm 22002777a 4500 dc Calvo Gómez, Míriam author Camboni, Alessandro author Enterria i Adan, David G. d' author Garrido Beltrán, Lluís author Grabalosa Gándara, Marc author Graciani Díaz, Ricardo author Graugés Pous, Eugeni author López Asamar, Elias author Musy, Marco author Pérez-Calero Yzquierdo, Antonio author Puig Navarro, Albert author Ruiz, Hugo (Ruiz Pérez) author Vázquez Gómez, Ricard author Vilasis-Cardona, Xavier author LHCb Collaboration author 2016-06-07T10:53:17Z 2016-06-07T10:53:17Z 2011-05-19 2016-06-07T10:53:22Z 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. Hadrons Teoria quàntica de camps Gravitació Teoria quàntica Relativitat (Física) Hadrons Quantum field theory Gravitation Quantum theory Relativity (Physics) Measurement of J/ψ production in pp collisions at √s = 7 TeV