Double parton scattering in pair-production of $J/\psi$ mesons at the LHC revisited

TL;DR

This paper investigates double parton scattering in $J/eta$ meson pair production at the LHC, providing theoretical predictions and highlighting the significance of DPS contributions at high energies for future experimental separation.

Contribution

It offers new theoretical predictions for $J/\psi$ pair production at 13 TeV, adjusted for experimental fiducial volumes, emphasizing DPS's role at high energies.

Findings

DPS contributes significantly to $J/\psi$ pair production at 13 TeV.

Predictions are tailored for LHCb and ATLAS fiducial volumes.

Higher energies increase the DPS rate, aiding in separating SPS and DPS.

Abstract

Double parton scattering (DPS) is studied at the example of $J/\psi$ pair-production in the LHCb and ATLAS experiments of the Large Hadron Collider (LHC) at centre-of-mass energies of $\sqrt{S}=$ 7, 8, and 13 TeV. We report theoretical predictions delivered to the LHCb and ATLAS collaborations adjusted for the fiducial volumes of the corresponding measurements during Run I and provide new predictions at 13 TeV collision energy. It is shown that DPS can lead to noticeable contributions in the distributions of longitudinal variables of the di-$J/\psi$ system, especially at 13 TeV. The increased DPS rate in double $J/\psi$ production at high energies will open up more possibilities for the separation of single parton scattering (SPS) and DPS contributions in future studies.