O.P.E. and Power Corrections to the QCD coupling constant

Details O.P.E. and Power Corrections to the QCD coupling constant O.P.E. and Power Corrections to the QCD coupling constant

2002-10-07

arxiv.org/abs/hep-ph/0210098v1

Nucl.Phys.Proc.Suppl.114:117-121,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, talk given at XXX International Meeting on Fundamental Physics, Jaca 2002

Scientific paper

10.1016/S0920-5632(02)01899-6

Lattice data seems to show that power corrections should be convoked to describe appropriately the transition of the QCD coupling constant running from U.V. to I.R. domains. Those power corrections for the Landau-gauge MOM coupling constant in a pure Yang-Mills theory (N_f=0) are analysed in terms of Operator Product Expansion (O.P.E.) of two- and three-point Green functions, the gluon condensate emerging from this study. The semi-classical picture given by instantons can be also used to look for into the nature of the power corrections and gluon condensate.

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