Scientific article
Open access

Measurement of the prompt J

ContributorsATLAS Collaboration
  • Open Access - SCOAP3
Publication date2017

The production of two prompt J/ψ mesons, each with transverse momenta pT>8.5 GeV and rapidity |y|<2.1 , is studied using a sample of proton-proton collisions at 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/ψ production, is measured as a function of the transverse momentum of the lower- pT J/ψ meson, di- J/ψ pT and mass, the difference in rapidity between the two J/ψ mesons, and the azimuthal angle between the two J/ψ mesons. The fraction of prompt pair events due to double parton scattering is determined by studying kinematic correlations between the two J/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) mb.

Citation (ISO format)
ATLAS Collaboration. Measurement of the prompt J. In: European physical journal. C, Particles and fields, 2017, vol. 77, n° 2, p. 76. doi: 10.1140/epjc/s10052-017-4644-9
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Article (Published version)
ISSN of the journal1434-6044

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