K-PERPENDICULAR-TO FACTORIZATION VS RENORMALIZATION-GROUP - A SMALL-XCONSISTENCY ARGUMENT

I investigate, at leading twist level, the consistency of the BFKL equ ation with the renormalization group, when next-to-leading log-x terms are included in the quark-sea channel of the anomalous dimension matr ix. By use of k(perpendicular to)-factorization, I find that, besides next-to-leading small-x resummation formulae, a leading, x-dependent r edefinition of initial quarks and gluons is needed. Its interpretation acid phenomenological relevance are briefly discussed.