Baryon structure from Lattice QCD

TL;DR

This paper reports on lattice QCD calculations of baryon properties, including spectrum and form factors, using various fermion schemes and comparing results across collaborations to advance understanding of baryon structure.

Contribution

The study provides new lattice QCD results on baryon spectrum and form factors using different fermion schemes, including twisted mass, staggered, and domain wall fermions, with comparisons to other works.

Findings

Calculated baryon masses and nucleon form factors down to 270 MeV pion mass.

Evaluated nucleon to Δ transition form factors, including dominant dipole form.

Extracted transverse density distributions of Δ in the infinite momentum frame.

Abstract

We present recent lattice results on the baryon spectrum, nucleon electromagnetic and axial form factors, nucleon to $\Delta$ transition form factors as well as the $\Delta$ electromagnetic form factors. The masses of the low lying baryons and the nucleon form factors are calculated using two degenerate flavors of twisted mass fermions down to pion mass of about 270 MeV. We compare to the results of other collaborations. The nucleon to $\Delta$ transition and $\Delta$ form factors are calculated in a hybrid scheme, which uses staggered sea quarks and domain wall valence quarks. The dominant dipole nucleon to $\Delta$ transition form factor is also evaluated using dynamical domain wall fermions. The transverse density distributions of the $\Delta$ in the infinite momentum frame are extracted using the form factors determined from lattice QCD.