Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-05-17
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, talk given at XXXX Rencontres de Moriond on QCD and Hadronic Interactions, La Thuile (Italy)
Scientific paper
Strong coupling constant computed in Landau gauge and MOM renormalization scheme from lattice two and three gluon Green Functions exhibits an unexpected behavior in the deep IR, showing a maximum value around $1 {\rm GeV}$. We analise this coupling below this maximum within a semiclassical approach, were gluon degrees of freedom at very low energies are described in terms of the classical solutions of the lagrangian, namely instantons. We provide some new results concerning the relationship between instantons and the low energy dynamics of QCD, by analising gluon two- and three-point Green functions separately and with the help of a cooling procedure to eliminate short range correlations.
Boucaud Ph.
Leroy J.-P.
Micheli J.
Pene Olivier
Rodríguez-Quintero José
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