Di-J/psi production at the Tevatron and the LHC

TL;DR

This paper reviews recent measurements of J/psi pair production at the Tevatron and LHC, highlighting evidence for significant double-parton scattering contributions and proposing relations to distinguish scattering types.

Contribution

It introduces simple relations involving feed-down fractions to differentiate single and double scatterings in J/psi pair production.

Findings

Data suggests significant double-parton scattering in J/psi production.

Effective cross section for double scattering is smaller than for jet observables.

Proposed relations aid in disentangling scattering mechanisms.

Abstract

We briefly review recent results which we have obtained in the study of J/psi-pair production at the Tevatron and the LHC. We claim that the existing data set from CMS and D0 point at a significant double-parton-scattering contribution with an effective cross section smaller than that for jet-related observables. We have also derived simple relations involving feed-down fractions from excited states which can help in disentangling the single from the double scatterings.