Unquenching the Schwinger Model (revised)

TL;DR

This paper investigates the lattice Schwinger model with Wilson fermions, demonstrating that a systematic expansion can accurately estimate long-distance physics from quenched configurations, with results on static potential and bound state mass.

Contribution

It introduces the use of a systematic expansion to extract long-distance physics from quenched lattice simulations of the Schwinger model, providing new estimates for static potential and bound state mass.

Findings

Good estimates of long-distance physics from quenched configurations

Results for static potential and lowest bound state mass

Validation of the systematic expansion approach

Abstract

We study the quenched and unquenched lattice Schwinger model with Wilson fermions. The lowest non-trivial order of the systematic expansion recently proposed by Sexton and Weingarten is shown to allow good estimates of long distance physics from quenched configurations. Results for the static potential and the lowest bound state mass are presented.