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29 March 2024
 
  » arxiv » hep-ph/0212192

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The strong coupling constant at small momentum as an instanton detector
Ph. Boucaud ; F. De Soto ; A. Le Yaouanc ; J.P. Leroy ; J. Micheli ; H. Moutarde ; O. Pène ; J. Rodr’{i}guez-Quintero ;
Date 13 Dec 2002
Journal JHEP 0304 (2003) 005
Subject hep-ph
AbstractWe present a study of $alpha_{MOM}(p)$ at small p computed from the lattice. It shows a dramatic $propto p^4$ law which can be understood within an instanton liquid model. In this framework the prefactor gives a direct measure of the instanton density in thermalised configurations. A preliminary result for this density is 5.27(4) fm^{-4}.
Source arXiv, hep-ph/0212192
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