We examine the role of multiple scattering in emission and/or diffraction spectroscopies that involve mediumand high-energy electrons. We use quantum-mechanical and classical methods to demonstrate the importance of multiple forward scattering in these techniques. Single-scattering theory produces errors because it neglects multiple forward scattering from atoms which shadow other atoms.
Two-component models have been quite successful in fitting multiplicity distributions in high-energy hadronic collisions. The fact that the diffractive component is considerably smaller than the short-range-correlation component suggests the possibility of a perturbative expansion of the high-energy total cross section. We develop such an expansion in this paper, and examine some of its consequences. Prominent among these consequences are: (i) diffraction dissociation into high masses rises approximately logarithmically with energy at NAL-ISR (CERN Intersecting Storage Rings) energies, (ii) the short-range-correlation part of the cross section has high-energy behavior dominated by a "bare" Pomeron Regge pole, and (iii) the average multiplicity of particles produced in diffractive dissociation rises logarithmically with energy.
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