Instanton contributions to the low-lying hadron mass spectrum

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dc.contributor.authorThomas, S.
dc.contributor.authorKamleh, W.
dc.contributor.authorLeinweber, D.
dc.date.issued2015
dc.descriptionPublished 24 November 2015
dc.description.abstractThe role of instanton-like objects in the QCD vacuum on the mass spectrum of low-lying light hadrons is explored in lattice QCD. Using overimproved stout-link smearing, tuned to preserve instanton-like objects in the QCD vacuum, the evolution of the mass spectrum under smearing is examined. The calculation is performed using a 20³×40 dynamical fat-link-irrelevant-clover (FLIC) fermion action ensemble with lattice spacing 0.126 fm. Through the consideration of a range of pion masses, the effect of the vacuum instanton content is compared at a common pion mass. While the qualitative features of ground-state hadrons are preserved on instanton-dominated configurations, the excitation spectrum experiences significant changes. The underlying physics revealed shows little similarity to the direct-instanton-interaction predictions of the instanton liquid model.
dc.description.statementofresponsibilitySamuel D. Thomas, Waseem Kamleh, and Derek B. Leinweber
dc.identifier.citationPhysical Review D: Particles, Fields, Gravitation and Cosmology, 2015; 92(9):094515-1-094515-12
dc.identifier.doi10.1103/PhysRevD.92.094515
dc.identifier.issn1550-7998
dc.identifier.issn1550-2368
dc.identifier.orcidKamleh, W. [0000-0002-6177-5366]
dc.identifier.orcidLeinweber, D. [0000-0002-4745-6027]
dc.identifier.urihttp://hdl.handle.net/2440/107770
dc.language.isoen
dc.publisherAmerican Physical Society
dc.relation.granthttp://purl.org/au-research/grants/arc/DP120104627
dc.relation.granthttp://purl.org/au-research/grants/arc/DP150103164
dc.rights© 2015 American Physical Society
dc.source.urihttps://doi.org/10.1103/physrevd.92.094515
dc.titleInstanton contributions to the low-lying hadron mass spectrum
dc.typeJournal article
pubs.publication-statusPublished

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