Associated-quarkonium production

TL;DR

This paper reviews the potential of associated-quarkonium production measurements at the LHC to probe gluon distributions, understand production mechanisms, and explore double-parton scatterings through various channels.

Contribution

It highlights the importance of different associated-quarkonium production channels as tools for advancing understanding of QCD phenomena at the LHC.

Findings

Quarkonium + photon production helps extract gluon TMDs.

Quarkonium + W/Z channels aid in understanding production mechanisms.

Quarkonium pair production offers rich information for QCD studies.

Abstract

We discuss the growing interest to measure associated-quarkonium production in a number of channels at the LHC. Whereas back-to-back production of quarkonium + isolated photon provides a unique way to extract gluon TMDs, observables such as quarkonium + W/Z can be of great help to better understand the quarkonium production mechanism as well as to shed light on double-parton scatterings. Along these lines, we also argue that quarkonium-pair production is a potentially rich source of information which only has started to be harvested. Finally, we discuss the relevance of studying the production of quarkonium + heavy-quark, as e.g. J/psi + charm and Upsilon + non-prompt J/psi.