Parton recombination effect in polarized parton distributions

Abstract

Parton recombination corrections to the standard spin-dependent Altarelli-Parisi evolution equation are considered in a nonlinear evolution equation. The properties of this recombination equation and its relation with the spin-averaged form are discussed.

Comments: 25 pages, 1 figure, to be published in Nucl. Phys. B. Appendix is corrected