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Studying the role of the 't Hooft interaction in QCD, by means of lattice simulations

โœ Scribed by P. Faccioli; T.A. DeGrand

Book ID
104354763
Publisher
Elsevier Science
Year
2004
Tongue
English
Weight
302 KB
Volume
129-130
Category
Article
ISSN
0920-5632

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โœฆ Synopsis

We report on a recent investigation on the dynamics of light quarks, at intermediate and low-energy. By measuring some appropriate correlation functions on the lattice, it is possible to probe the Dirac and flavor structure of the non-perturbative quark-quark interaction and look directly for signatures of the 't Hooft Lagrangian. Results obtained with chiral fermions strongly support the instanton picture and the phenomenological parameters of the Instanton Liquid Model.

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The infrared behaviour of QCD in the Landau gauge is studied in 244 and 324 lattices by measuring the Kugo-Ojima parameter, gluon propagator, ghost propagator and the QCD running coupling. The Kugo-Ojima parameter c remains about 0.8 instead of the expectation value 1. We observe infrared suppressio