Paper
Measurement of the prompt $J/ψ$ pair production cross-section in $pp$ collisions at $\sqrt{s} = 8$ TeV with the ATLAS detector
Authors
ATLAS Collaboration
Abstract
The production of two prompt mesons, each with transverse momenta GeV and rapidity , is studied using a sample of proton-proton collisions at TeV, corresponding to an integrated luminosity of 11.4 fb collected in 2012 with the ATLAS detector at the LHC. The differential cross-section, assuming unpolarised production, is measured as a function of the transverse momentum of the lower- meson, di- and mass, the difference in rapidity between the two mesons, and the azimuthal angle between the two mesons. The fraction of prompt pair events due to double parton scattering is determined by studying kinematic correlations between the two 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 mb.