arXiv:hep-ph/0406302·v2·High Energy Physics — Phenomenology
Collins-Soper Equation for the Energy Evolution of Transverse-Momentum and Spin Dependent Parton Distributions
Ahmad Idilbi🇺🇸 · Xiangdong Ji🇺🇸 · Jian-Ping Ma🇨🇳 · Feng Yuan🇺🇸
Abstract
The hadron-energy evolution (Collins and Soper) equation for all the leading-twist transverse-momentum and spin dependent parton distributions is derived in the impact parameter space. Based on the result, we present resummation formulas for the spin structure functions in the semi-inclusive deep inelastic scattering.
Comments: 16 pages, 4 figures included, revised version