The muon $g-2$ with four flavors of staggered quarks

TL;DR

This paper provides updated lattice QCD calculations of the leading hadronic contribution to the muon g-2 using 2+1+1 flavor HISQ ensembles, including finite-volume and taste-breaking corrections.

Contribution

It introduces new lattice data at the physical pion mass with an additional lattice spacing and applies NNLO staggered chiral perturbation theory for systematic corrections.

Findings

Updated results for the hadronic contribution to muon g-2

Inclusion of finite-volume and taste-breaking effects

Use of physical pion mass ensembles

Abstract

We present updated results for the light-quark connected part of the leading hadronic contribution to the muon $g-2$ from configurations with 2+1+1 flavors of HISQ quarks using the time-momentum representation of the electromagnetic current correlator. We have added statistics on two ensembles as well as a fourth lattice spacing using configurations that have been generated by the MILC collaboration at the physical pion mass. Additionally we account for the leading finite-volume and taste-breaking effects using Staggered Chiral Perturbation Theory at NNLO.