Search for low-lying lattice QCD eigenstates in the Roper regime

Simple item page
dc.contributor.authorKiratidis, A.
dc.contributor.authorKamleh, W.
dc.contributor.authorLeinweber, D.
dc.contributor.authorLiu, Z.
dc.contributor.authorStokes, F.
dc.contributor.authorThomas, A.
dc.date.issued2017
dc.description.abstractThe positive-parity nucleon spectrum is explored in 2 + 1 flavor lattice QCD in a search for new low-lying energy eigenstates near the energy regime of the Roper resonance. In addition to conventional three-quark operators, we consider novel, local five-quark meson-baryon type interpolating fields that hold the promise to reveal new eigenstates that may have been missed in previous analyses. Drawing on phenomenological insight, five-quark operators based on σN, πN and a0N channels are constructed. Spectra are produced in a high-statistics analysis on the PACS-CS dynamical gauge-field configurations with mπ = 411 MeV via variational analyses of several operator combinations. Despite the introduction of qualitatively different interpolating fields, no new states are observed in the energy regime of the Roper resonance. This result provides further evidence that the low-lying finite-volume scattering states are not localized, and strengthens the interpretation of the Roper as a coupled-channel, dynamically-generated meson-baryon resonance.
dc.description.statementofresponsibilityAdrian L. Kiratidis, Waseem Kamleh, Derek B. Leinweber, Zhan-Wei Liu, Finn M. Stokes and Anthony W. Thomas
dc.identifier.citationPhysical Review D (particles, fields, gravitation, and cosmology), 2017; 95(7):074507-1-074507-8
dc.identifier.doi10.1103/PhysRevD.95.074507
dc.identifier.issn2470-0010
dc.identifier.issn2470-0029
dc.identifier.orcidKamleh, W. [0000-0002-6177-5366]
dc.identifier.orcidLeinweber, D. [0000-0002-4745-6027]
dc.identifier.orcidStokes, F. [0000-0003-1763-8847]
dc.identifier.orcidThomas, A. [0000-0003-0026-499X]
dc.identifier.urihttp://hdl.handle.net/2440/106143
dc.language.isoen
dc.publisherAmerican Physical Society
dc.relation.granthttp://purl.org/au-research/grants/arc/CE1101004
dc.relation.granthttp://purl.org/au-research/grants/arc/LE160100051
dc.relation.granthttp://purl.org/au-research/grants/arc/DP150103101
dc.relation.granthttp://purl.org/au-research/grants/arc/DP150103164
dc.relation.granthttp://purl.org/au-research/grants/arc/DP120104627
dc.relation.granthttp://purl.org/au-research/grants/arc/LE120100181
dc.rights© 2017 American Physical Society
dc.source.urihttps://doi.org/10.1103/physrevd.95.074507
dc.titleSearch for low-lying lattice QCD eigenstates in the Roper regime
dc.typeJournal article
pubs.publication-statusPublished

Files

Collections

Chemistry and Physics publications