Nucleon Scalar and Tensor Charges from Lattice QCD with Light Wilson Quarks

TL;DR

This paper reports lattice QCD calculations of nucleon scalar and tensor charges using multiple fermion formulations and pion mass ranges, providing precise estimates relevant for understanding nucleon structure.

Contribution

It presents new lattice QCD results for nucleon charges with controlled systematic uncertainties across different fermion actions and pion masses.

Findings

Consistent nucleon scalar and tensor charge results across multiple lattice formulations.

Good control over excited-state contamination and chiral extrapolation.

Results relevant for phenomenology and beyond Standard Model physics.

Abstract

We present 2+1 flavor Lattice QCD calculations of the nucleon scalar and tensor charges. Using the BMW clover-improved Wilson action with pion masses between 150 and 350 MeV and three source-sink separations between 0.9 and 1.4 fm, we achieve good control over excited-state contamination and extrapolation to the physical pion mass. As a consistency check, we also present results from calculations using unitary domain wall fermions with pion masses between 300 and 400 MeV, and using domain wall valence quarks and staggered sea quarks with pion masses between 300 and 600 MeV.