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Observation of double charm production involving open charm 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 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 Hadrons Teoria quàntica de camps Gravitació Relativitat (Física) Teoria quàntica Hadrons Quantum field theory Gravitation Relativity (Physics) Quantum theory The production of J/ψ mesons accompanied by open charm, and of pairs of open charm hadrons are observed in pp collisions at a centre-of-mass energy of 7 TeV using an integrated luminosity of 355 pb−1 collected with the LHCb detector. Model independent measurements of absolute cross-sections are given together with ratios to the measured J/ψ and open charm cross-sections. The properties of these events are studied and compared to theoretical predictions. 2014-10-02T09:22:32Z 2014-10-02T09:22:32Z 2012-05 2014-10-02T09:22:32Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció del document publicat a: http://dx.doi.org/10.1007/JHEP06(2012)141 Journal of High Energy Physics, 2012, vol. 06 , num. 141, p. 1-35 http://dx.doi.org/10.1007/JHEP06(2012)141 cc by (c) LHCb Collaboration, 2012 http://creativecommons.org/licenses/by/3.0/ info:eu-repo/semantics/openAccess Springer Verlag Articles publicats en revistes (Física Quàntica i Astrofísica)