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https://hdl.handle.net/2440/107770
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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 1550-2368 |
Statement of Responsibility: | 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 |
DOI: | 10.1103/PhysRevD.92.094515 |
Grant ID: | http://purl.org/au-research/grants/arc/DP120104627 http://purl.org/au-research/grants/arc/DP150103164 |
Published version: | http://dx.doi.org/10.1103/physrevd.92.094515 |
Appears in Collections: | Aurora harvest 8 Special Research Centre for the Subatomic Structure of Matter publications |
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