COHERENT STATES IN GAUGE THEORIES AND APPLN IN COLLIDER PHY

The idea of coherent states was suggested in QED in the middle of 1960's and in QCD at the end of the 1970's to introduce a realistic definition of initial and final states, where the number of quanta is not determined, unlike the usual approach in perturbation theory. In addition to simply solving conceptual infrared divergences of the S-Matrix, it allows a description of the properties of the QED and QCD radiation to all orders in perturbation theory.

In lepton colliders, it gives a precis...