Journal of Physics G: Nuclear Physics

The authors find that pseudovector pi N coupling gives a Perey effect suppression in the matrix element in (p,d) reactions. This is in contrast to the case of pseudoscalar coupling where there is no suppression.

The charge-exchange two-nucleon invariant mass spectrum for deuteron breakup at 3.3 GeV/c is investigated using a one-pion-exchange model. Kinematical cuts are introduced so as to reproduce those taken in a 1976 Dubna experiment. The authors find that these cuts have substantial effects on the position and width of the mass spectrum in the delta resonance region.

The differential cross section, vector analysing power and three components of the second-rank tensor analysing power were measured for quasi-elastic scattering of 170 MeV ²³Na from ²⁰⁸Pb. The data have been successfully interpreted in terms of the tidal symmetry model and the sign and magnitude of the observed polarisation effects are in good agreement with the known quadrupole moment of ²³Na.

The main features of purely phenomenological and quark-gluon string models are analysed with respect to the momentum distribution of the secondary particles in high-energy hadron interactions. Some predictions of both models are discussed.

The authors construct an extension of the gauge technique to two-dimensional supersymmetric gauge theories. This involves a derivation of the spectral representation of a scalar superpropagator in two dimensions. They apply the method to the massive supersymmetric Schwinger model. In the case that the gauge multiplet mass equals twice that of the matter multiplet they determine the spectral functions of the matter propagator.

This paper provides an introduction to the following three articles.

An illustrated survey is given of the physics that is accessible in photoproduction experiments.

Theoretical and experimental investigations of direct photon production in hadronic interactions are reviewed. The formalism for the lowest-order quantum chromodynamics calculations is outlined and qualitative predictions are presented. Uncertainties and corrections to the theory are discussed. A review of the experimental techniques is followed by a summary of recent experimental data. Advances in the study of the structure of direct photon events and of the production of pairs of direct photons are summarised.

In contemporary high-energy physics, the photon plays a central role in testing the standard model. This review describes how the photon can be used to test perturbative quantum chromodynamics. The theoretical framework is summarised and several important examples are discussed in detail. Some recent quantitative results are presented.