Strange and charm contributions to nucleon charges and moments

TL;DR

This paper reports on lattice QCD calculations of strange and charm quark contributions to nucleon charges and moments, using multiple lattice spacings and pion masses, with nonperturbative renormalization and extrapolation to physical parameters.

Contribution

First comprehensive lattice QCD study of strange and charm nucleon charges with multiple lattice spacings and pion masses, including nonperturbative renormalization and extrapolation.

Findings

Results for scalar, axial, and tensor charges obtained.

Unpolarized first moments calculated.

Chiral and continuum extrapolations performed.

Abstract

We present preliminary results for strange and charm contributions to nucleon charges and moments. The scalar, axial and tensor charges, and unpolarized first moments are calculated using clover-on-HISQ formulation and cover four lattice spacings, $a=\{0.06,0.09,0.12, 0.15\}$~fm, and three pion masses, $M_\pi=\{310,220,130\}$~MeV. The renormalization factors are calculated nonperturbatively using the RI-sMOM scheme. We carry out a chiral and continuum extrapolation to obtain physical results.