Beyond leading order effects in photon pair production at the Fermilab Tevatron - art. no. 114016

We discuss the effects induced by beyond leading order contributions to pho ton pair production. We point out that next to leading order contributions to the fragmentation component of the signal lead to a change in the shape of distributions. This is already mildly visible in present Fermilab Tevatr on data though stringent isolation criteria tend to suppress the fragmentat ion component considerably. We expect the effect to be experimentally confi rmed in future data samples with higher statistics which would serve as a p recision test for QCD.