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oai:recercat.cat:2445/992652025-12-04T21:30:27Zcom_2072_1057col_2072_478812col_2072_478823col_2072_478904col_2072_478917

Measurement of ψ(2S) meson production in pp collisions at √s=7 TeV Abellan Beteta, Carlos Calvo Gómez, Míriam Camboni, Alessandro Comerma Montells, Albert Domingo Bonal, Francesc Garrido Beltrán, Lluís Gascón Fora, David Grabalosa Gándara, Marc Graciani Díaz, Ricardo Graugés Pous, Eugeni López Asamar, Elias Pérez-Calero Yzquierdo, Antonio Pie Valls, B. (Blai) Potterat, Cédric Puig Navarro, Albert Roselló, M. Ruiz, Hugo (Ruiz Pérez) Vázquez Gómez, Ricard Vilasis-Cardona, Xavier LHCb Collaboration Teoria quàntica de camps Gravitació Relativitat (Física) Teoria quàntica Hadrons Quantum field theory Gravitation Relativity (Physics) Quantum theory Hadrons The differential cross-section for the inclusive production of ψ(2S) mesons in pp collisions at s√=7 TeVs=7 TeV has been measured with the LHCb detector. The data sample corresponds to an integrated luminosity of 36 pb−1. The ψ(2S) mesons are reconstructed in the decay channels ψ(2S)→μ + μ − and ψ(2S)→J/ψπ + π −, with the J/ψ meson decaying into two muons. Results are presented both for promptly produced ψ(2S) mesons and for those originating from b-hadron decays. In the kinematic range p T(ψ(2S))≤16 GeV/c and 2<y(ψ(2S))≤4.5 we measure https://static-content.springer.com/image/art%3A10.1140%2Fepjc%2Fs10052-012-2100-4/MediaObjects/10052_2012_2100_Equa_HTML.gif where the last uncertainty on the prompt cross-section is due to the unknown ψ(2S) polarization. Recent QCD calculations are found to be in good agreement with our measurements. Combining the present result with the LHCb J/ψ measurements we determine the inclusive branching fraction https://static-content.springer.com/image/art%3A10.1140%2Fepjc%2Fs10052-012-2100-4/MediaObjects/10052_2012_2100_Equb_HTML.gif where the last uncertainty is due to the (b→J/ψX)B(b→J/ψX) , (J/ψ→μ+μ−)B(J/ψ→μ+μ−) and (ψ(2S)→e+e−)B(ψ(2S)→e+e−) branching fraction uncertainties. 2016-06-06T11:06:17Z 2016-06-06T11:06:17Z 2012-04 2016-06-06T11:06:23Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1434-6044 https://hdl.handle.net/2445/99265 619610 eng Reproducció del document publicat a: http://dx.doi.org/10.1140/epjc/s10052-012-2100-4 European Physical Journal C, 2012, vol. 72, p. 2100 http://dx.doi.org/10.1140/epjc/s10052-012-2100-4 cc-by (c) LHCb Collaboration, 2012 http://creativecommons.org/licenses/by/3.0/es info:eu-repo/semantics/openAccess application/pdf Società Italiana di Fisica & Springer Verlag Articles publicats en revistes (Física Quàntica i Astrofísica)