Extracting gluon condensate from the average plaquette

Abstract

The perturbative contribution in the average plaquette is subtracted using Borel summation and the remnant of the plaquette is shown to scale as a dim-4 condensate. A critical review is presented of the renormalon subtraction scheme that claimed a dim-2 condensate. The extracted gluon condensate is compared with the latest result employing high order (35-loop) calculation in the stochastic perturbation theory.

Comments: 4 pages, Talk given at QCD14, the 17th International QCD Conference, 30 June--4 July 2014, Montpellier (France), to appear in the Proceedings