First results from dynamical chirally improved fermions

TL;DR

This paper reports initial results from simulating four-dimensional Quantum Chromodynamics using dynamical chirally improved fermions, employing the Hybrid Monte Carlo algorithm with stout smearing on a lattice, and presents measurements of meson masses and topological tunneling.

Contribution

It introduces the implementation of dynamical chirally improved fermions with HMC and stout smearing, extending previous quenched studies to include dynamical quarks.

Findings

Estimate of lattice spacing and meson masses.

Evidence of tunneling between topological sectors.

Successful simulation of dynamical chirally improved fermions.

Abstract

We simulate Quantum Chromodynamics in four Euclidean dimensions with two (degenerate mass) flavors of dynamical quarks. The Dirac operator is the so-called chirally improved operator that has been studied so far in quenched calculations. We now present results of an implementation with the Hybrid Monte Carlo (HMC) algorithm including stout smearing. Our results are from an 8^3x16 lattice with tadpole improved Luescher-Weisz gauge action. We present our estimate of the lattice spacing, the pi and rho meson masses and evidence for tunneling between different topological sectors.