# Semi-inclusive and exclusive measurements with EIC: The advantages of lower energies

## TL;DR

This paper discusses how lower-energy electron-ion colliders can provide significant advantages for detailed measurements of nucleon structure, especially in semi-inclusive and exclusive deep inelastic scattering, compared to higher-energy colliders.

## Contribution

It demonstrates the benefits of moderate CM energy and symmetric configurations for precise nucleon structure measurements at the EIC.

## Key findings

- Lower energies improve angular and energy resolution of final-state particles.
- Moderate CM energy enhances large-x coverage in measurements.
- Symmetric E_e/E_p configurations optimize the detection of semi-inclusive and exclusive processes.

## Abstract

Exploring the nucleon's sea quark and gluon structure is a prime objective of a future electron-ion collider (EIC). Many of the key questions require accurate differential semi-inclusive (spin/flavor decomposition, orbital motion) and exclusive (spatial distributions of quarks/gluons) DIS measurements in the region 0.01 < x < 0.3 and Q^2 ~ few 10 GeV^2. Such measurements could ideally be performed with a high-luminosity collider of moderate CM energy, s ~ 10^3 GeV^2, and relatively symmetric configuration, e.g. E_e/E_p = 5/30-60 GeV. Specific examples are presented, showing the advantages of this setup (angular/energy distribution of final-state particles, large-x coverage) compared to typical high-energy colliders.