PS05 Hadronic Physics
Integral and derivative dispersion relations, analysis of the forward scattering data
Institut de Physique, Universitè de Liège, Bât. B5-a, Sart Tilman, B4000 Liège, Belgium
Accepted: 7 November 2003
Published online: 25 November 2003
Integral and derivative dispersion relations (DR) are considered for the forward scattering pp and amplitudes. A new representation for the derivative DR, valid not only at high energy, is obtained. The data on the total cross sections for interaction as well as the data on the parameter ρ are analyzed within the various forms of the DR and high-energy Regge models. It is shown that three models for the Pomeron, Simple pole Pomeron, Tripole Pomeron and Dipole Pomeron (the both with the intercept equal unit) lead to practically equivalent description of the data at 5 GeV. It is also shown that the correctly calculated low-energy part of the dispersion integral (from the two-proton threshold up to 5 GeV) allows to reproduce well the ρ data at low energies without additional free parameters.
Pacs: 13.85.Lg – 11.55.Fv – 11.55.Jy
© Società Italiana di Fisica, Springer-Verlag, 2004