Diquark mass differences from unquenched lattice QCD

TL;DR

This study uses lattice QCD simulations to compute diquark mass differences, examining effects of quark masses and lattice spacing, providing insights into diquark properties relevant for understanding hadron structure.

Contribution

It presents the first unquenched lattice QCD calculation of diquark mass differences using overlap valence quarks and domain wall fermion configurations.

Findings

Scalar diquark mass difference measured for light quarks

Axial vector diquark mass difference determined for strange-light quarks

Results show dependence on sea quark mass and lattice spacing

Abstract

We calculate diquark correlation functions in the Landau gauge on the lattice using overlap valence quarks and 2+1-flavor domain wall fermion configurations. Quark masses are extracted from the scalar part of quark propagators in the Landau gauge. Scalar diquark quark mass difference and axial vector scalar diquark mass difference are obtained for diquarks composed of two light quarks and of a strange and a light quark. Light sea quark mass dependence of the results is examined. Two lattice spacings are used to check the discretization effects. The coarse and fine lattices are of sizes $24^3\times64$ and $32^3\times64$ with inverse spacings $1/a=1.75(4) {\rm~GeV}$ and $2.33(5) {\rm~GeV}$, respectively.