Prof John Cardy FRS

Abstract:

We show that, within a consistent picture of a Pomeron pole of intercept one which evades the decoupling arguments, total cross-sections should factorise in the energy reǵime where three and more Pomeron cuts are negligible. © 1973.

Abstract:

We investigate pomeron cut contributions in the triple-pomeron limit of one-particle inclusive cross sections, near t = 0 where the triple-pole coupling vanishes. We find that at t = 0 the cuts themselves are suppressed, contributing factors (lnM²)^-2, rather than the single logarithms characteristic of cut contributions in two-body processes. We construct a simple reggeon calculus model in which all important cuts near t = 0 can be calculated, and suggest a simple way of parametrizing the data in that region. © 1973.

Abstract:

We study high energy elastic electron-electron scattering at wide angles in quantum electrodynamics. The amplitude is predicted to decrease exponentially with increasing energy, in agreement with strong interaction data. © 1969.

Abstract:

A reggeon calculus is derived from a hybrid perturbation-theory model using eikonal techniques. The resulting reggeon coupling functions have a simple form which enables many diagrams of interest to be evaluated explicitly. As an example, the properties of iterated Regge cuts are discussed and evaluated. Another important result is that the physical pomeron is not expected to have factorisable residues. © 1969.