Photon-Photon Interaction in Glueball Production

Abstract

In the last years many exotic states have been identified in several colliders around the world. One of the exotic states provided in QCD is the glueball. Using a non-relativistic gluon bound-state model, we compute [Formula: see text], where [Formula: see text] is a pseudoscalar, tensor, or scalar digluon. For the starting from the amplitudes we considers the process [Formula: see text] at threshold, where the amplitudes are obtained in perturbative QCD at lowest order by deriving them from QED calculation and the [Formula: see text]s are massive constituent gluons. In this calculation the unknown parameters of the model, such as the digluon wave function, are obtained using measured values of [Formula: see text]. Our theorical results are compared with the present experimental limits for the various glueballs candidates.