Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2007-09-21
PoSLAT2007:142,2007
Physics
High Energy Physics
High Energy Physics - Lattice
contribution to XXV International Symposium on Lattice Field Theory, July 2007, Regensburg
Scientific paper
The non-perturbative quark-gluon interaction depends significantly on the value of the quark mass. In particular, in the light quark mass regime, correlations are strongly influenced by dynamics associated to chiral symmetry breaking. We use the Interacting Instanton Liquid Model (IILM) as a tool to investigate the microscopic dynamical mechanisms which underly the dependence on the quark mass and drive the transition into the chiral regime of QCD. To ensure the validity of the model, we first verify that the dependence on the quark mass for several observables calculated in the IILM agrees well with the predictions of chiral perturbation theory and with lattice simulations. We then show that a quark mass m*~80 MeV emerging naturally from the model specifies the mass scale above which the dynamics associated with low-lying eigenmodes of the Direac operator becomes sub-leading and the contribution of the fermion determinant is suppressed.
Cristoforetti Marco
Faccioli Pietro
Negele John W.
Traini Marco
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