Associated J/psi + gamma Photoproduction as a Probe of the Colour-Octet Mechanism

Cacciari, Matteo; Greco, Mario; Krämer, Michael

Associated J/psi + gamma Photoproduction as a Probe of the Colour-Octet Mechanism

Authors

Cacciari, Matteo

Greco, Mario

Krämer, Michael

Description

The associated production of a J/psi and a photon in photon-hadron collisions is considered, and shown to be a good probe of the presence of colour-octet mediated channels in quarkonia production, as predicted by the factorization approach within NRQCD. Total and differential cross sections for photoproduction at fixed target experiments and at HERA are presented. Associated J/psi + gamma production at hadron colliders is briefly discussed.
LaTeX2e, 18 pages, 4 figures