MONTE-CARLO STUDIES OF PHOTON PRODUCTION IN POLARIZED PROTON-PROTON COLLISIONS

We present first results obtained with a polarized version of the PYTH IA code, describing high-energy polarized hadron-hadron reactions. Suc h reactions are of great theoretical and experimental interest, as the y give additional information on the internal spin structure of the ha drons, complementary to what can be obtained from polarized lepton-nuc leon scattering. Experiments of this kind are under consideration both for the fixed target and for the collider mode. We demonstrate that c orrections like e.g. showering influence the obtained asymmetries and enter the theoretical analyses necessary to deduce physically interest ing quantities from the data. We also discuss the dominant background mechanisms, namely pion decay. We conclude that to determine the physi cs one can deduce from any kind of experimental setup a full-fledged n umerical simulation is needed, towards which our present code is the f irst step.