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The predictions of QCD for the evolution of the quark and gluon structure functions of a polarized proton are discussed. In fact, the parton polarizations increase with energy, for fixed Feynman x. Thus, polarized protons may be useful for the discovery or investigation of new physical phenomena at very high energy, especially if there are new interactions or particles whose behavior violates one of the natural symmetries of QCD, such as parity. The mean gluon asymmetry grows as ℓnQ2, which implies that the orbital angular momentum of the gluons grows similarly.The evolution of the fragmentation of a parton into hadron is also governed by QCD. For these, we conjecture that the fragmentation of a quark or gluon into a spinning hadron may well show helicity correlations. The evolution equations then predict an energy evolution similar to the behavior of the structure functions. The spin correlations in fragmentation could be useful in e−e+ and e±p reactions with polarized electrons and in deeply inelastic neutrino scattering, even if the hadronic targets are unpolarized

Polarization effects in hadron structure functions and in quark and gluon fragmentation