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Observation of X(3872) 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 Musy, Marco Pérez-Calero Yzquierdo, Antonio Picatoste Olloqui, Eduardo Pie Valls, B. (Blai) Potterat, Cédric Puig Navarro, Albert Roselló, M. Ruiz, Hugo (Ruiz Pérez) Vázquez Gómez, Ricard Vilasis-Cardona, Xavier LHCb Collaboration Física nuclear Hadrons Teoria quàntica de camps Astrofísica Energia nuclear Nuclear physics Hadrons Quantum field theory Astrophysics Nuclear energy Using 34.7 pb−1 of data collected with the LHCb detector, the inclusive production of the X(3872) meson in pp collisions at s√=7~TeV is observed for the first time. Candidates are selected in the X(3872)→J/ψπ + π − decay mode, and used to measure where σ(pp→X(3872)+anything) is the inclusive production cross section of X(3872) mesons with rapidity in the range 2.5<br>4.5 and transverse momentum in the range 5<br>20 GeV/c. In addition the masses of both the X(3872) and ψ(2S) mesons, reconstructed in the J/ψπ + π − final state, are measured to be mX(3872)=3871.95±0.48 (stat)±0.12 (syst) MeV/c2 and mψ(2S)=3686.12±0.06 (stat)±0.10 (syst) MeV/c2. 2014-10-02T10:06:00Z 2014-10-02T10:06:00Z 2012-05 2014-10-02T10:06:00Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2190-5444 https://hdl.handle.net/2445/57951 619623 eng Reproducció del document publicat a: http://doi.dx.org/10.1140/epjc/s10052-012-1972-7 European Physical Journal Plus, 2012, vol. 72, num. 1972, p. 1-9 http://dx.doi.org/10.1140/epjc/s10052-012-1972-7 cc by (c) LHCb Collaboration, 2012 http://creativecommons.org/licenses/by/3.0/ info:eu-repo/semantics/openAccess 9 p. application/pdf EDP Sciences Articles publicats en revistes (Física Quàntica i Astrofísica)