Nucleon structure from RBC/UKQCD 2+1 flavor DWF dynamical ensembles at a nearly physical pion mass

TL;DR

This paper reports on nucleon structure calculations using (2+1)-flavor dynamical domain-wall fermion ensembles at near-physical pion masses, achieving low residual mass and optimized source smearing.

Contribution

It presents new lattice ensembles with low pion masses and small residual mass, enabling improved nucleon structure calculations near physical conditions.

Findings

Preliminary nucleon mass estimates of 0.98 and 1.05 GeV.

Ensembles generated at about 1.4 GeV cutoff with small residual mass.

Optimized Gaussian smearing enhances nucleon source quality.

Abstract

We report the status of nucleon structure calculations on the (2+1)-flavor dynamical domain-wall fermions ensembles with pion masses as low as 180 and 250 MeV on a lattice with about 4.6 fm spatial extent. A combination of the Iwasaki+dislocation- suppressing-determinant-ratio (I+DSDR) gauge action and DWF fermion action allows us to generate these ensembles at cutoff of about 1.4 GeV while keeping the residual mass small. Nucleon source Gaussian smearing has been optimized. Preliminary nucleon mass estimates are 0.98 and 1.05 GeV.