Theoretical analysis of double parton scatterings in quarkonium production in proton-proton collisions at the LHC

TL;DR

This paper provides a theoretical analysis of double parton scatterings in quarkonium production at the LHC, highlighting their significance in explaining experimental data and revisiting single parton scattering contributions.

Contribution

It offers a detailed theoretical examination of DPS in quarkonium production and revisits SPS calculations, providing evidence for DPS in recent LHC data.

Findings

ATLAS data indicates evidence for DPS in J/psi + Z and J/psi + W productions.

Revised SPS calculations show their limited contribution compared to DPS.

Theoretical insights improve understanding of parton interactions in proton collisions.

Abstract

The production process of quarkonia in proton-proton (pp) collision is a very good probe of the parton structure of the proton. Recent experimental data of the production of J/psi+vector boson or quarkonium pairs at the LHC and Tevatron suggest the relevance of double parton scatterings (DPS). We discuss here the single parton scattering (SPS) contribution to the J/psi +Z, J/psi +W, and J/psi +J/psi productions in hadron collisions. By revisiting the computations of the SPS contributions to the J/psi+Z and J/psi +W productions, we demonstrate that the ATLAS data in fact show evidence for DPS.