Measurement of the prompt $J/\psi$ pair production cross-section in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector

Abstract

The production of two prompt $J/\psi$ mesons, each with transverse momenta $p_{\mathrm{T}}>8.5$ GeV and rapidity $|y|<2.1$, is studied using a sample of proton-proton collisions at $\sqrt{s}=8$ TeV, corresponding to an integrated luminosity of 11.4 fb${}^{-1}$ collected in 2012 with the ATLAS detector at the LHC. The differential cross-section, assuming unpolarised $J/\psi$ production, is measured as a function of the transverse momentum of the lower-$p_{\mathrm{T}}$ $J/\psi$ meson, di-$J/\psi$ $p_{\mathrm{T}}$ and mass, the difference in rapidity between the two $J/\psi$ mesons, and the azimuthal angle between the two $J/\psi$ mesons. The fraction of prompt pair events due to double parton scattering is determined by studying kinematic correlations between the two $J/\psi$ 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 ${\sigma }_{\mathrm{eff}}=6.3\pm 1.6(\mathrm{stat})\pm 1.0(\mathrm{syst})$ mb.

53 pages in total, author list starting page 37, 15 figures, 4 tables, published version, all figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2015-02/

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• Double-parton scattering effects in associated production of charm mesons and dijets at the LHC
• Working Group 5: Physics with Heavy Flavours