Twist-2 Compton Operator and Its Hidden Structure: WW-, CG- and Other Relations

摘要

We show that the group-theoretic structure of the Compton operator at leading geometric twist-2 allows, among other relations, to derive, without any approximation and using no dynamical input, operator versions of the Wandzura-Wilczek and the (power corrected) Callan-Gross relations. Their functional form is exactly the same as for deep inelastic scattering.