# Width of Long Colour Flux Tubes in Lattice Gauge Systems

## TL;DR

This paper investigates how the width of colour flux tubes in lattice gauge theories expands logarithmically with quark separation, supported by new and precise data from 3D Z_2 gauge theory and the 3D Ising model.

## Contribution

It provides empirical evidence confirming the effective string theory prediction for flux tube width growth in 3D lattice gauge systems.

## Key findings

- Flux tube width grows logarithmically with quark separation.
- Data from 3D Z_2 gauge theory and 3D Ising model support the effective string model.
- High precision data over large distance ranges confirm theoretical predictions.

## Abstract

In the confining phase of any gauge system the mean squared width of the colour flux tube joining a pair of quarks should grow logarithmically as a function of their distance, according to the effective string description of its infrared properties. New data on 3D Z_2 gauge theory, combined with high precision data on the interface physics of the 3D Ising model fit nicely this behaviour over a range of more than two orders of magnitude.