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oai:recercat.cat:20.500.14342/33072025-03-11T04:09:13Zcom_2072_482405com_2072_183628col_2072_482415

Updated measurements of exclusive J/ψ and ψ(2S) production cross-sections in pp collisions at s√=7 TeV Badalov, Alexey Calvo Gómez, Míriam Camboni, Alessandro Vilasís Cardona, Xavier LHCb Collaboration - CERN Universitat Ramon Llull. La Salle CERN Gran col·lisionador d'hadrons (França i Suïssa) Protons Col·lisions (Física nuclear) Partícules (Física nuclear) 539 The differential cross-section as a function of rapidity has been measured for the exclusive production of J/ψ and ψ(2S) mesons in proton–proton collisions at √s = 7 TeV, using data collected by the LHCb experiment, corresponding to an integrated luminosity of 930 pb−1. The cross-sections times branching fractions to two muons having pseudorapidities between 2.0 and 4.5 are measured to be σpp→J/ψ →μ+μ− (2.0 < ημ± < 4.5) = 291 ± 7 ± 19 pb, σpp→ψ(2S)→μ+μ− (2.0 < ημ± < 4.5) = 6.5 ± 0.9 ± 0.4 pb, where the first uncertainty is statistical and the second is systematic. The measurements agree with next-to-leading order QCD predictions as well as with models that include saturation effects. 2014-02 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.14342/3307 https://doi.org/10.1088/0954-3899/41/5/055002 eng Journal of Physics G: Nuclear and Particle Physics, 2014, Vol. 41, No. 5 Attribution 4.0 International © CERN http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess 20 p. IOPscience