Nucleon structure from 2+1-flavor domain-wall QCD

TL;DR

This paper reports on lattice-QCD calculations of nucleon structure, including form factors and quark distributions, using 2+1-flavor domain-wall fermions at near-physical pion masses.

Contribution

First detailed lattice-QCD study of multiple nucleon structure observables using 2+1-flavor domain-wall fermions at near-physical pion masses.

Findings

Calculated nucleon form factors and quark distributions.

Results at pion masses close to physical values.

Provides data for understanding nucleon internal structure.

Abstract

Nucleon-structure calculations of isovector vector- and axialvector-current form factors, transversity and scalar charge, and quark momentum and helicity fractions are reported from two recent 2+1-flavor dynamical domain-wall fermions lattice-QCD ensembles generated jointly by the RIKEN-BNL-Columbia and UKQCD Collaborations with Iwasaki $\times$ dislocation-suppressing-determinatn-ratio gauge action at inverse lattice spacing of 1.378(7) GeV and pion mass values of 249.4(3) and 172.3(3) MeV.