HARD PHOTON PAIR PRODUCTION AT LEP

The production of photon pairs in e+e- --> ffgammagammaBAR processes i s studied using exact helicity amplitudes at tree level. Total cross s ections, including initial state radiation effects, are given. They ar e presented in the case of quarks as a function of y(cut) in the JADE algorithm. In the case of leptons we use cuts similar to the ones empl oyed in a recent L3 analysis. Masses of the final state fermions are t aken into account when appropriate. The cross section e+e- --> tau+tau -gammagamma is about 10% larger when the tau mass is neglected. We obt ain, with a different method, results which are in good agreement with L3 Monte Carlo simulation.