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|Title:||Instanton contributions to the low-lying hadron mass spectrum|
|Citation:||Physical Review D - Particles, Fields, Gravitation and Cosmology, 2015; 92(9):094515-1-094515-12|
|Publisher:||American Physical Society|
|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|
|Appears in Collections:||Special Research Centre for the Subatomic Structure of Matter publications|
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