Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/105700
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Type: Journal article
Title: Hamiltonian effective field theory study of the N* (1440) resonance in lattice QCD
Author: Liu, Z.-.W.
Kamleh, W.
Leinweber, D.
Stokes, F.
Thomas, A.
Wu, J.-.J.
Citation: Physical Review D, 2017; 95(3):034034-1-034034-14
Publisher: American Physical Society
Issue Date: 2017
ISSN: 2470-0010
2470-0029
Statement of
Responsibility: 
Zhan-Wei Liu, Waseem Kamleh, Derek B. Leinweber, Finn M. Stokes, Anthony W. Thomas and Jia-Jun Wu
Abstract: We examine the phase shifts and inelasticities associated with the N∗(1440) Roper resonance, and we connect these infinite-volume observables to the finite-volume spectrum of lattice QCD using Hamiltonian effective field theory. We explore three hypotheses for the structure of the Roper resonance. All three hypotheses are able to describe the scattering data well. In the third hypothesis the Roper resonance couples the low-lying bare basis-state component associated with the ground-state nucleon with the virtual meson-baryon contributions. Here the nontrivial superpositions of the meson-baryon scattering states are complemented by bare basis-state components, explaining their observation in contemporary lattice QCD calculations. The merit of this scenario lies in its ability to not only describe the observed nucleon energy levels in large-volume lattice QCD simulations but also explain why other low-lying states have been missed in today’s lattice QCD results for the nucleon spectrum.
Rights: © 2017 American Physical Society
RMID: 0030067678
DOI: 10.1103/PhysRevD.95.034034
Grant ID: http://purl.org/au-research/grants/arc/CE1101004
http://purl.org/au-research/grants/arc/LE160100051
http://purl.org/au-research/grants/arc/DP150103101
http://purl.org/au-research/grants/arc/DP150103164
http://purl.org/au-research/grants/arc/DP120104627
http://purl.org/au-research/grants/arc/LE120100181
Appears in Collections:Physics publications

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