Psi(2S) production in proton-proton collisions at RHIC, Tevatron and LHC energies

TL;DR

This paper reviews psi(2S) production data from RHIC, Tevatron, and LHC, comparing it with theoretical predictions and highlighting areas of agreement and discrepancy, especially at high transverse momentum.

Contribution

It systematically compares experimental psi(2S) production data with color-singlet-model predictions across multiple energies and kinematic variables, identifying where models succeed or need refinement.

Findings

Good overall agreement with models at low transverse momentum.

Discrepancies at large transverse momentum suggest missing higher-order corrections.

Potential dominance of color-octet processes at high transverse momentum.

Abstract

We briefly review the existing psi(2S) data taken at RHIC, the Tevatron and the LHC. We systematically compare them with colour-singlet-model predictions as a function of the center-of-mass energy, of the quarkonium rapidity and of the quarkonium transverse momentum. The overall agreement is good except for large transverse momenta. This points at the existence of large NNLO corrections or points at colour-octet dominance.