Nuclear Effects in High Energy Photon and Neutral Pion Production

Abstract

We study the mechanism of the $\gamma$ and ${\pi }^0$ enhancement at large transverse momenta in proton-nucleus collisions. A proposed mechanism suggests an increase in the width of the transverse momentum distribution of partons in a semihard process.

Comments: 3 pages, World Scientific style included. Talk presented by G. Papp at the Workshop "Understanding Deconfinement in QCD", ECT*, Trento, 1-13/March, 1999