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Type: Journal article
Title: Instanton contributions to the low-lying hadron mass spectrum
Author: Thomas, S.
Kamleh, W.
Leinweber, D.
Citation: Physical Review D - Particles, Fields, Gravitation and Cosmology, 2015; 92(9):094515-1-094515-12
Publisher: American Physical Society
Issue Date: 2015
ISSN: 1550-7998
Statement of
Samuel D. Thomas, Waseem Kamleh, and Derek B. Leinweber
Abstract: The 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.
Description: Published 24 November 2015
Rights: © 2015 American Physical Society
RMID: 0030075487
DOI: 10.1103/PhysRevD.92.094515
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Appears in Collections:Special Research Centre for the Subatomic Structure of Matter publications

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