出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We analyze the energy scale dependence of fragmentation functions from e+-e− collisions using
conventional momentum measures xp and xp and rapidity y. We find that replotting fragmentation
functions on normalized rapidity u results in a compact form precisely represented by the
beta distribution, its two parameters varying slowly and simply with parton energy scale Q. The
resulting parameterization enables extrapolation of fragmentation functions to small Q in order to
describe fragment distributions at low transverse momentum pt in heavy ion collisions at RHIC.
