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

Understand

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.