$N^{\ast }$ 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 $Q^2$.

arXiv comment9 pages, invited talk at workshop "Nucleon Resonances: from Photoproduction to High Photon Virtualities", ECT*, Trento, Italy, 12-16 October, 2015

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• Resonance Scattering Phase Shifts on a Non-Rest Frame Lattice
• Ab initio calculation of the neutron-proton mass difference
• Excited state baryon spectroscopy from lattice QCD
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• Toward the excited meson spectrum of dynamical QCD
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• The coupled-channel scattering on a torus
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• Hybrid Baryons in QCD
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• Clebsch-Gordan Construction of Lattice Interpolating Fields for Excited Baryons
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