Measurement of the prompt J/ ψ pair production cross-section in pp collisions at √s=8 TeV with the ATLAS detector

Sarah Barnes, Rafal Bielski, Brian Cox, Cinzia Da Via, Nick Dann, Giulio Forcolin, Alessandra Forti, Julia Iturbe Ponce, Xingguo Li, Frederick Loebinger, Stephen Marsden, Jiri Masik, Stephen Menary, Francisca Munoz Sanchez, Thomas Neep, Alexander Oh, Rustem Ospanov, Joleen Pater, Yvonne Peters, Andrew PilkingtonArnaud Pin, Darren Price, Yang Qin, John Raine, Savanna Shaw, Lee Tomlinson, Stephen Watts, Fabian Wilk, Martin Woudstra, Terence Wyatt, The ATLAS Collaboration

    Research output: Contribution to journalArticlepeer-review


    The production of two prompt J/ψJ/ψ mesons, each with transverse momenta pT>8.5pT>8.5 GeV and rapidity |y|<2.1|y|<2.1 , is studied using a sample of proton-proton collisions at s√=8s=8 TeV, corresponding to an integrated luminosity of 11.4 fb −1−1 collected in 2012 with the ATLAS detector at the LHC. The differential cross-section, assuming unpolarised J/ψJ/ψ production, is measured as a function of the transverse momentum of the lower- pTpT J/ψJ/ψ meson, di- J/ψJ/ψ pTpT and mass, the difference in rapidity between the two J/ψJ/ψ mesons, and the azimuthal angle between the two J/ψJ/ψ mesons. The fraction of prompt pair events due to double parton scattering is determined by studying kinematic correlations between the two J/ψJ/ψ mesons. The total and double parton scattering cross-sections are compared with predictions. The effective cross-section of double parton scattering is measured to be σeff=6.3±1.6(stat)±1.0(syst)σeff=6.3±1.6(stat)±1.0(syst) mb.
    Original languageEnglish
    Article number76
    JournalEuropean Physical Journal C. Particles and Fields
    Issue number76
    Early online date7 Feb 2017
    Publication statusPublished - 2017


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