Ancient_Nomad Messages 15 Reaction score 0 Thread starter Apr 13, 2010 #1 What are Hard QCD processes ?
ansgar Messages 514 Reaction score 1 Apr 14, 2010 #2 hard means perturbative, i.e. processes which one can calculate using perturbation theory = momentum transfer is larger than around 250 GeV. At this energy, the QCD coupling constant becomes "large" so that perturbation theory is no longer valid.
hard means perturbative, i.e. processes which one can calculate using perturbation theory = momentum transfer is larger than around 250 GeV. At this energy, the QCD coupling constant becomes "large" so that perturbation theory is no longer valid.