$N^{\ast }$ Resonances in Lattice QCD from (mostly) Low to (sometimes) High Virtualities

Abstract

I present a survey of calculations of the excited $N^{\ast }$ 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 $Q^2$.

Comments: 9 pages, invited talk at workshop "Nucleon Resonances: from Photoproduction to High Photon Virtualities", ECT*, Trento, Italy, 12-16 October, 2015