Physics results from dynamical overlap fermion simulations

TL;DR

This paper summarizes physics results from large-scale dynamical overlap fermion simulations, including calculations of fundamental QCD parameters and properties, using fixed topological sectors and finite volume corrections.

Contribution

It presents new physics results from dynamical overlap fermion simulations, including methods to correct finite volume effects and measurements of key QCD observables.

Findings

Calculated chiral condensate and pion properties.

Measured vacuum polarization functions and nucleon sigma term.

Reconstructed theta-vacuum physics from fixed topological sector simulations.

Abstract

I summarize the physics results obtained from large-scale dynamical overlap fermion simulations by the JLQCD and TWQCD collaborations. The numerical simulations are performed at a fixed global topological sector; the physics results in the theta-vacuum is reconstructed by correcting the finite volume effect, for which the measurement of the topological susceptibility is crucial. Physics applications we studied so far include a calculation of chiral condensate, pion mass, decay constant, form factors, as well as (vector and axial-vector) vacuum polarization functions and nucleon sigma term.