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Pseudoscalar Vertex and Quark Masses
J-R. Cudell, A. Le Yaouanc, C. Pittori
We analyse available data on the quark pseudoscalar vertex and extract the contribution og the Goldstone boson pole. The strength of the pole is found to be quite large at presentl…
High-Energy Forward Scattering and the Pomeron: Simple Pole versus Unitarized Models
J. R. Cudell, V. Ezhela, K. Kang +2
Using the largest data set available, we determine the best values that the data at t=0 (total cross sections and real parts of the hadronic amplitudes) give for the intercepts and…
The Transverse Cross Section in Exclusive Vector-Meson Production
J. R. Cudell, I. Royen
We show that the ratio of the transverse to the longitudinal cross sections observed at HERA cannot be reproduced by models which assume that the meson can be described by an on-sh…
Perturbative Evolution and Regge Behaviour
J R Cudell, A Donnachie, P V Landshoff
The known analytic properties of the Compton amplitude at small place significant constraints on its behaviour at large . This calls for a re-evaluation of the role of p…