Test of the QCD vacuum with the sources in higher representations

Recent accurate measurements [1, 2] of the static potentials between sources in various SU(3) representations provide a crucial test of the QCD vacuum and of different theoretical approaches to the confinement. In particular, the Casimir scaling of static potentials found for all measured distances implies strong suppression of higher cumulants and a high accuracy of the Gaussian stochastic vacuum. Most popular models are in conflict with these measurements.