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 precise
determination of the line-shape production of the J/ , the Z and
the Higgs bosons, while in QCD it allows a realistic description of
quark and gluon jets, of the transverse momentum distribution of W,
Z and H produced in hadron collisions, and other related
quantities.The book consists of a collection of the articles
published by the author and his collaborators in about fifty years,
with an introduction highlighting the main results of each article
and the various links between them.
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