The Drell-Levy-Yan Relation: ep vs $e^{+}{e}^{-}$ Scattering to $O({\alpha }_s^2)$

J. Blümlein, V. Ravindran, W. L. van Neerven

We study the validity of a relation by Drell, Levy and Yan (DLY) connecting the deep inelastic structure (DIS) functions and the single-particle fragmentation functions in $e^{+}{e}^{-}$…