Extracting gluon condensate from the average plaquette

Understand

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.