The strong coupling constant at small momentum as an instanton detector
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Lattice Gauge field theoriesConfinement
Solitons monopoles and instantons
Lattice QCD
Publication date
2003Abstract
We present a study of ¿MOM(p) at small p computed from the lattice in the quenched approximation (nf = 0). It shows a dramatic proptop4 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.