%0 Journal Article
%A Stokes, Finn
%A Kamleh, Waseem
%A Leinweber, Derek B.
%T Elastic form factors of nucleon excitations in lattice QCD
%J Physical review / D
%V 102
%N 1
%@ 2470-0010
%C Melville, NY
%I Inst.812068
%M FZJ-2021-00716
%P 014507
%D 2020
%X First principles calculations of the form factors of baryon excitations are now becoming accessible through advances in lattice-QCD techniques. In this paper, we explore the utility of the parity-expanded variational analysis (PEVA) technique in calculating the Sachs electromagnetic form factors for excitations of the proton and neutron. We study the two lowest-lying odd-parity excitations and demonstrate that at heavier quark masses, these states are dominated by behavior consistent with constituent quark models for the N∗(1535) and N∗(1650), respectively. We also study the lowest-lying localized even-parity excitation and find that its form factors are consistent with a radial excitation of the ground-state nucleon. A comparison of the results from the PEVA technique with those from a conventional variational analysis exposes the necessity of the PEVA approach in baryon excited-state studies.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000548448400002
%R 10.1103/PhysRevD.102.014507
%U https://juser.fz-juelich.de/record/890127