TY - JOUR
T1 - Measurement of the prompt J/ψ pair production cross-sectionin pp collisions at √s = 8 TeV with the ATLAS detector
AU - ATLAS Collaboration
AU - Newman, Paul
N1 - 53 pages in total, author list starting page 37, 15 figures, 4 tables, submitted to EPJC, all figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2015-02/
PY - 2017/2/7
Y1 - 2017/2/7
N2 - 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-pTpTJ/ψJ/ψ meson, di-J/ψJ/ψpTpT 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.
AB - 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-pTpTJ/ψJ/ψ meson, di-J/ψJ/ψpTpT 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.
U2 - 10.1140/epjc/s10052-017-4644-9
DO - 10.1140/epjc/s10052-017-4644-9
M3 - Article
SN - 1434-6044
VL - 77
JO - European Physical Journal C
JF - European Physical Journal C
M1 - 76
ER -