Effects of Dynamical Quarks in UKQCD Simulations

TL;DR

This paper presents UKQCD dynamical quark simulations showing evidence of quark effects in the static potential and minimal effects in the hadronic spectrum, advancing understanding of sea quark influences.

Contribution

It introduces matched ensembles with fixed lattice parameters to isolate dynamical quark effects in lattice QCD simulations.

Findings

Evidence of dynamical quark effects in static quark potential

Less pronounced effects in the hadronic spectrum

Use of matched ensembles to control lattice parameters

Abstract

Recent results from the UKQCD Collaboration's dynamical simulations are presented. The main feature of these ensembles is that they have a fixed lattice spacing and volume, but varying sea quark mass from infinite (corresponding to the quenched simulation) down to roughly that of the strange quark mass. The main aim of this work is to uncover dynamical quark effects from these ``matched'' ensembles. We obtain some evidence of dynamical quark effects in the static quark potential with less effects in the hadronic spectrum.