$N^*$ Resonances in Lattice QCD from (mostly) Low to (sometimes) High Virtualities

TL;DR

This paper surveys lattice QCD calculations of the excited nucleon spectrum, discusses recent methods for extracting phase shifts and form factors, and explores their applications to understanding nucleon structure at various virtualities.

Contribution

It introduces recent advances in extracting momentum-dependent phase shifts and electromagnetic form factors for excited nucleons from lattice QCD data.

Findings

Progress in calculating excited N* spectrum in lattice QCD.

Development of methods to extract phase shifts from lattice data.

Calculations of electromagnetic transition form factors at high Q^2.

Abstract

I present a survey of calculations of the excited $N^*$ spectrum in lattice QCD. I then describe recent advances aimed at extracting the momentum-dependent phase shifts from lattice calculations, notably in the meson sector, and the potential for their application to baryons. I conclude with a discussion of calculations of the electromagnetic transition form factors to excited nucleons, including calculations at high $Q^2$.