The strong coupling constant at small momentum as an instanton detector

Creators: Boucaud, Ph.; Soto, F. de; Le Yaouanc, A.; Leroy, J. P.; Micheli, J.; Moutarde, H.; Pène, Olivier; Rodríguez Quintero, J.

Others:: Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear; Fundación Cámara

Description

We present a study of αMOM(p) at small p computed from the lattice in the quenched approximation (nf = 0). It shows a dramatic ∝ p4 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

Abstract

European Network HPRN-CT-2000-00145

Abstract

Spanish Fundación Cámara HF2000-0056

The strong coupling constant at small momentum as an instanton detector

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