4 papers
Pion-nucleon scattering in a Bethe-Salpeter approach
A. D. Lahiff, I. R. Afnan
A covariant model of elastic pion-nucleon scattering based on the Bethe-Salpeter equation is presented. We obtain a good description of the S- and P-wave phase shifts up to 360 MeV…
Measurement of the F2n/F2p and d/u Ratios in Deep Inelastic Electron Scattering off 3H and 3He
G. G. Petratos, I. R. Afnan, F. Bissey +4
We discuss a possible measurement of the ratio of the nucleon structure functions, F2n/F2p, and the ratio of the up to down quark distributions, u/d, at large x, by performing deep…
Perturbation schemes for systems of nucleons and pions: The relationship of covariant perturbation theory, the convolution integral and time-ordered perturbation theory
D. R. Phillips, I. R. Afnan
This paper is the first in a series of three which attempt to resolve the difficulties that have plagued the problem for the past ten years. Various theoretical inconsiste…
A Gauge Invariant Unitary Theory for Pion Photoproduction
C. H. M. van Antwerpen, I. R. Afnan
A covariant, unitary and gauge invariant theory for pion photoproduction on a single nucleon is presented. To achieve gauge invariance at the operator level one needs to include bo…