# Opportunities for spin physics at EIC

## TL;DR

This paper reviews the potential of the Electron-Ion Collider (EIC) for advancing spin physics research, highlighting measurements of polarized structure functions, PDFs, TMDs, GPDs, and the exploration of spin effects in various final states.

## Contribution

It provides a comprehensive overview of the experimental opportunities and scientific questions that can be addressed with the EIC in the field of spin physics.

## Key findings

- EIC enables detailed studies of electroweak polarized structure functions.
- Probing gluon TMDs through heavy quark production is feasible.
- Spin-dependent fragmentation functions offer additional insights.

## Abstract

This is a brief overview of the spin physics opportunities at a high energy, high luminosity, polarized Electron-Ion Collider (EIC). It covers measurements of electroweak polarized structure functions, quark and gluon PDFs, TMDs, GPDs and GTMDs. Exploiting the many possible final states allows to probe various spin effects. Open and bound heavy quark production can be used to probe gluon TMDs, but also color-octet NRQCD long distance matrix elements. Spin-dependent fragmentation functions can be used too, but are also interesting in themselves. Especially for studies of the small-$x$ and the high-$Q^2$ spin structure the EIC will be essential.