The strong coupling constant at small momentum as an instanton detector

Details The strong coupling constant at small momentum as an instanton detector The strong coupling constant at small momentum as an instanton detector

2002-12-13

arxiv.org/abs/hep-ph/0212192v1

JHEP 0304:005,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 4 figures

Scientific paper

10.1088/1126-6708/2003/04/005

We present a study of $\alpha_{MOM}(p)$ at small p computed from the lattice.
It shows a dramatic $\propto p^4$ 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}.

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