Cut moments and a generalization of DGLAP equations

Abstract

We elaborate a cut (truncated) Mellin moments (CMM) approach that is constructed to study deep inelastic scattering in lepton-hadron collisions at the natural kinematic constraints. We show that generalized CMM obtained by multiple integrations of the original parton distribution $f(x,{\mu }^2)$ as well as ones obtained by multiple differentiations of this $f(x,{\mu }^2)$ also satisfy the DGLAP equations with the correspondingly transformed evolution kernel $P(z)$. Appropriate classes of CMM for the available experimental kinematic range are suggested and analyzed. Similar relations can be obtained for the structure functions $F(x)$, being the Mellin convolution $F=C\ast f$, where $C$ is the coefficient function of the process.

Comments: 11 pages