TY - JOUR
T1 - Measurement of the prompt J/ ψ pair production cross-section in pp collisions at √s=8 TeV with the ATLAS detector
AU - Barnes, Sarah
AU - Bielski, Rafal
AU - Cox, Brian
AU - Da Via, Cinzia
AU - Dann, Nick
AU - Forcolin, Giulio
AU - Forti, Alessandra
AU - Iturbe Ponce, Julia
AU - Li, Xingguo
AU - Loebinger, Frederick
AU - Marsden, Stephen
AU - Masik, Jiri
AU - Menary, Stephen
AU - Munoz Sanchez, Francisca
AU - Neep, Thomas
AU - Oh, Alexander
AU - Ospanov, Rustem
AU - Pater, Joleen
AU - Peters, Yvonne
AU - Pilkington, Andrew
AU - Pin, Arnaud
AU - Price, Darren
AU - Qin, Yang
AU - Raine, John
AU - Shaw, Savanna
AU - Tomlinson, Lee
AU - Watts, Stephen
AU - Wilk, Fabian
AU - Woudstra, Martin
AU - Wyatt, Terence
AU - The ATLAS Collaboration,
PY - 2017
Y1 - 2017
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- 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.
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- 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.
UR - https://www.scopus.com/pages/publications/85011954449
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. Particles and Fields
JF - European Physical Journal C. Particles and Fields
IS - 76
M1 - 76
ER -