Topological susceptibility and Instanton size distribution from over-improved cooling

TL;DR

This paper introduces a method using over-improved cooling to measure topological susceptibility and instanton size distribution, effectively preserving large instantons and providing new insights into topological features in gauge theories.

Contribution

It demonstrates that over-improved cooling maintains large instantons indefinitely and enables the measurement of instanton size distribution by varying the cooling parameter.

Findings

Large instantons survive over-improved cooling indefinitely

Over-improved cooling allows measurement of instanton size distribution

Method provides new insights into topological properties in gauge theories

Abstract

We measure the topological susceptibility by cooling with an over-improved action. In contrast with usual cooling, large instantons survive over-improved cooling {\em indefinitely}. By varying the parameter of the over-improved cooling action, we measure the instanton size distribution.