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Type: Journal article
Title: Elastic form factors of nucleon excitations in lattice QCD
Author: Stokes, F.M.
Kamleh, W.
Leinweber, D.B.
Citation: Physical Review D: Particles, Fields, Gravitation and Cosmology, 2020; 102(1):014507-1-014507-25
Publisher: American Physical Society
Issue Date: 2020
ISSN: 2470-0010
Statement of
Finn M. Stokes, Waseem Kamleh and Derek B. Leinweber
Abstract: 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.
Rights: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
DOI: 10.1103/PhysRevD.102.014507
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