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

Atlas Collaboration

Research output: Contribution to journalArticlepeer-review

77 Scopus citations

## 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 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-pTJ/ ψ meson, di-J/ ψpT 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.

Original language English (US) 76 European Physical Journal C 77 2 https://doi.org/10.1140/epjc/s10052-017-4644-9 Published - Feb 1 2017

## ASJC Scopus subject areas

• Engineering (miscellaneous)
• Physics and Astronomy (miscellaneous)

## Fingerprint

Dive into the research topics of 'Measurement of the prompt J/ ψ pair production cross-section in pp collisions at √s=8 TeV with the ATLAS detector'. Together they form a unique fingerprint.