# What does kinematical target mass sensitivity in DIS reveal about hadron structure?

## TL;DR

This paper investigates how kinematical target mass effects in deep-inelastic scattering reveal insights into the internal structure of hadrons, emphasizing the importance of exact target mass treatment in QCD analysis.

## Contribution

It introduces an exact treatment of target mass effects in DIS within QCD factorization, highlighting the implications for understanding hadron structure and nonperturbative scales.

## Key findings

- Target mass effects can improve phenomenological fits in DIS.
- Exact target mass treatment reveals a hierarchy of nonperturbative scales.
- Kinematical approximations relate to the internal structure of hadrons.

## Abstract

We study the role of purely external kinematical approximations in inclusive deep-inelastic lepton--hadron scattering within QCD factorization, and consider factorization with an exact treatment of the target hadron mass. We discuss how an observed phenomenological improvement obtained by accounting for target mass kinematics could be interpreted in terms of general properties of target structure, and argue that such an improvement implies a hierarchy of nonperturbative scales within the hadron.