Quarkonia production and polarization at the hadron colliders

TL;DR

This paper reviews recent experimental results on quarkonium production at the LHC, highlighting agreements with non-relativistic QCD predictions for cross sections and discrepancies in polarization measurements, and discusses various production channels.

Contribution

It provides a comprehensive review of LHC quarkonium production data, emphasizing the contrast between cross section agreement and polarization discrepancies with theory.

Findings

Production cross sections agree with non-relativistic QCD predictions.

Polarization measurements disagree with all current theoretical models.

Various production channels are analyzed for understanding quarkonium hadroproduction.

Abstract

This talk presents a review of recent results for quarkonium production at the LHC from ATLAS, CMS, LHCb, and ALICE. Production cross sections for $J/\psi$, $\psi(2S)$, and $\Upsilon(mS)$, and production ratios for $\chi_{c,bJ}$ are found to be in good agreement with predictions from non-relativistic QCD. In contrast, spin-alignment (polarization) measurements seem to disagree with all theoretical predictions. Some other production channels useful for investigating quarkonium hadroproduction mechanisms are also considered.