Scaling and ChPT Description of Pions from N_f=2 twisted mass QCD

TL;DR

This paper uses lattice QCD simulations with twisted mass fermions and chiral perturbation theory to accurately determine pion properties, low-energy constants, and light-quark parameters.

Contribution

It provides a novel combined approach of lattice QCD and ChPT to precisely extract fundamental light-quark and pion parameters.

Findings

Precise values for low-energy constants of ChPT.

Accurate determination of light-quark mass.

Estimates of the chiral condensate.

Abstract

We study light-quark observables by means of dynamical lattice QCD simulations using two flavours of twisted mass fermions at maximal twist. We employ chiral perturbation theory to describe our data for the pion mass and decay constant. In this way, we extract precise determinations for the low-energy constants of the effective theory as well as for the light-quark mass and the chiral condensate.