Eur. Phys. J. C 18, 555-561
DOI: 10.1007/s100520100548

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

P. Desgrolard¹, M. Giffon¹, E. Martynov² and E. Predazzi<sup>3

1</sup>  Institut de Physique Nucléaire de Lyon, IN2P3-CNRS et Université Claude Bernard, 43 boulevard du 11 novembre 1918, 69622 Villeurbanne Cedex, France
²  Bogoliubov Institute for Theoretical Physics, NAS of Ukraine, 03143 Kiev-143, Metrologicheskaja 14b, Ukraine
³  Dipartimento di Fisica Teorica, Università di Torino and Sezione INFN di Torino, 10125 Torino, Italy

desgrolard@ipnl.in2p3.fr
giffon@ipnl.in2p3.fr
martynov@bitp.kiev.ua
predazzi@to.infn.it

(Received: 23 June 2000 / Revised version: 13 November 2000 / Published online: 23 January 2001 -© Società Italiana di Fisica, Springer-Verlag 2001)

Abstract
The exchange degeneracy of the mesonic f, , and a₂ 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.

© Società Italiana di Fisica, Springer-Verlag 2001