William R. Frazer

Diffraction dissociation into high masses at N.A.L.-I.S.R. energies

Abstract The triple-pomeron picture of diffraction dissociation into high masses, combined with recent observations about the dominance of short-range correlations in multiparticle production at very high energies, implies that the cross section for diffractive dissociation into high masses rises approximately logarithmically in the NAL-ISR energy range. Predictions are also made about the multiplicity distribution of diffractively-produced particles.

Scaling and the approach to scaling in Reggeon field theory

Abstract We address ourselves to the problem of the approach to asymptotic scaling in Reggeon field theory. We present a method of integration of the renormalization group equations and obtain the asymptotic scaling functions, as well as the corrections which occur at non-asymptotic energies.

Representation of the supercritical Pomeron propagator

Abstract Analytic continuation in the bare Pomeron intercept is discussed in the context of a representation of the Pomeron propagator derived by the renormalization-group approach. When the bare intercept is above the critical value, the leading singularity turns out to be a branch point fixed at J = 1. The resulting cross section grows like (ln s ) r . where r is a ratio of critical exponents. In the one- and two-loop approximations, r ≈ 1.

Recent Progress in Particle Physics

Although I am honored to have been asked to give the final summary talk of this conference, I must say right away that it is impossible to summarize such a wide range of topics as we have discussed in the past two weeks. The particles discussed ranged from point-like partons, through our familiar mesons and baryons, to the other extreme of the particles Ehlers was concerned with — which turned out to be small rocks or even golf balls! Therefore I will not try to summarize, but will instead give you some personal reflections on the theme of this conference, progress in particle physics.

Multiplicity distributions in high energy hadronic collisions

Multiplicity distributions of hadrons produced in high energy collisions show the qualitative behavior characteristic of short-range correlation (SRC) modes. In addition, several phenomenological studies have inferred the presence of a relatively small diffractive component. This diffractive component can be interpreted in terms of Pomeron exchange. If the Pomeron singularity is assumed to be predominantly a factorizable Regge pole, specific predictions result for the multiplicity distribution.

Phenomenology and Models of Strong Interactions at Very High Energies

In these lectures I will review some of the striking observations made in high-energy multiparticle reactions at the ISR and at NAL in the past two years — observations which have an immediate impact on our understanding of the strong interactions. First, and most striking, is the confirmation of the hypothesis of short-range correlations in rapidity. Direct and convincing confirmation came from measurement of two-particle correlations at the ISR. The second observation is that of high-energy diffraction dissociation. That this process should exist was no surprise, but some features of diffractive production had to be observed before the general picture became clear. One feature is the magnitude. The question, before we saw the data, was whether diffractive production is a small or large part of multiparticle production. The first estimates of the magnitude came from fits to multiplicity distributions from NAL, where it was found from two-component models that the diffractive component is only about 20% of the inelastic cross section, whereas the short-range correlation (SRC) component is about 80%.

Perturbative Approach to High‐Energy Multiparticle Reactions

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. The development of such an expansion is discussed, as well as some of its consequences.