Nuclear higher-twist effects in eA DIS

TL;DR

This paper compares two approaches to nuclear higher-twist effects in electron-nucleus deep inelastic scattering, revealing that certain results depend on approximations that may neglect important contributions.

Contribution

It clarifies the relation between collinear approximation and light-cone path integral formalism, highlighting the impact of approximation choices on gluon emission calculations.

Findings

N=1 rescattering contribution vanishes in collinear approximation

Neglecting terms in collinear expansion can lead to nonzero gluon spectrum

Previous results by Guo, Wang, and Zhang are affected by approximation issues

Abstract

We discuss the relation between the treatments of the higher twist nuclear effects in eA DIS based on the pQCD collinear approximation and the light-cone path integral formalism. We show that in the collinear approximation the N=1 rescattering contribution to the gluon emission vanishes. It is demonstrated that the nonzero gluon spectrum obtained by Guo, Wang and Zhang is a consequence of unjustified neglect of some terms in the collinear expansion.