Unpolarized and polarized structure functions and spin tests at supercollider energies

Abstract

We present a simple analytic parametrization for quark and gluon distributions inside a polarized or unpolarized proton. It is valid for small enough x and for very large $Q^2$, the kinematic domain relevant for supercollider energies. We calculate some helicity hadron asymmetries in polarized-hadron collisions in the multi-TeV energy range and we discuss further possibilities of significant spin effects.