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The hadron-energy evolution (Collins and Soper) equation for all theleading-twist transverse-momentum and spin dependent parton distributions isderived in the impact parameter space. Based on the result, we presentresummation formulas for the spin structure functions in the semi-inclusivedeep inelastic scattering.Comment: 16 pages, 4 figures included, revised versio

Collins-Soper equation for the energy evolution of transverse-momentum and spin dependent parton distributions