Measurement of the prompt J/ψ pair production cross-section in pp collisions at sqrt(s) = 8 TeV with the ATLAS detector

Allbrooke, Benedict, Asquith, Lily, Cerri, Alessandro, DeSanto, Antonella, Salvatore, Fabrizio, Suruliz, Kerim, Sutton, Mark and Vivarelli, Iacopo (2017) Measurement of the prompt J/ψ pair production cross-section in pp collisions at sqrt(s) = 8 TeV with the ATLAS detector. European Physical Journal C - Particles and Fields, 77 (76). ISSN 1434-6044

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Abstract

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 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/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.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science
Q Science > QC Physics
Q Science > QC Physics > QC0770 Nuclear and particle physics. Atomic energy. Radioactivity
Q Science > QC Physics > QC0770 Nuclear and particle physics. Atomic energy. Radioactivity > QC0793 Elementary particle physics
Depositing User: Iacopo Vivarelli
Date Deposited: 18 Dec 2017 10:02
Last Modified: 18 Dec 2017 10:03
URI: http://sro.sussex.ac.uk/id/eprint/72227

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