# The Pauli Form Factor of Quark and Nontrivial Topological Structure of the QCD

## TL;DR

This paper calculates the quark's electromagnetic Pauli form factor considering QCD vacuum instantons, revealing significant effects with implications for photon-hadron reactions and quark matter dynamics.

## Contribution

It introduces a calculation of the quark Pauli form factor incorporating nontrivial topological QCD effects, highlighting their importance.

## Key findings

- Instantons significantly influence the quark Pauli form factor.
- Results impact understanding of photon-hadron interactions.
- Findings relevant for quark matter in extreme conditions.

## Abstract

We calculate the electromagnetic Pauli form factor of quark induced by the nontrivial topological fluctuations of QCD vacuum called instantons. It is shown that such contribution is significant. We discuss the possible implications of our result in the photon-hadron reactions and in the dynamics of quark-photon interactions in the dense/hot quark matter.