Exchange-degenerate Regge trajectories: a fresh look from resonance and forward scattering regions

Abstract

The exchange-degeneracy of the mesonic $f$, $\ddot{I}‰$, $\ddot{I}$ and $a_2$ Regge trajectories, dominant at moderate and high energies in hadron elastic scattering, is analyzed from two viewpoints. The first one concerns the masses of the resonances lying on these trajectories; the second one deals with the total cross-sections and the ratios of the real to the imaginary parts of the forward amplitudes of hadron and photon induced reactions. Neither set of data supports exact exchange-degeneracy.

13 pages, LaTeX2e, 4 eps figures. Revised version accepted for publication in European Physical Journal C