Coherent States in High-Energy Physics
C. S. Lam
Abstract
The amplitude for emitting n bosons factorizes into the product of n single-boson emission amplitudes, if the source is energetic and abelian. If it is energetic but non-abelian, the amplitude is given by a sum of factorized quasi-particle amplitudes. A quasi-particle is made up of an arbitrary number of bosons, but couples to the source like a single one. Factorization is related to coherence, and it allows computation of subleading contributions not obtainable by usual means. Its importance is illustrated in two applications: to solve the baryon problem in large-Nc QCD, and to obtain a total cross section satisfying the Froissart bound.
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