Overlap Valence Quarks on a Twisted Mass Sea

TL;DR

This paper investigates a mixed action approach combining overlap valence quarks with maximally twisted mass sea quarks, analyzing continuum limit scaling and the impact of chiral zero modes using lattice QCD configurations.

Contribution

It introduces a specific matching condition on the pion mass to study continuum scaling and the effects of chiral zero modes in a mixed action lattice QCD setup.

Findings

Continuum limit scaling of the pion decay constant analyzed.

Role of chiral zero modes in the continuum limit studied.

Results obtained across multiple lattice spacings and pion masses.

Abstract

We present the results of an investigation of a mixed action approach of overlap valence and maximally twisted mass sea quarks. Employing a particular matching condition on the pion mass, we analyze the continuum limit scaling of the pion decay constant and the role of chiral zero modes of the overlap operator in this process. We employ gauge field configurations generated by the European Twisted Mass Collaboration with linear lattice size $L$ ranging from 1.3 to 1.9 fm. The continuum limit is taken at a fixed value of $L=1.3$ fm, employing three values of the lattice spacing and two values of the pion mass constructed from sea quarks only.