A new measurement of the total e^+e^- ->hadrons cross-section in the centre of mass energy range 1, 8-2, 5 GeV, performed by the FENICE experiment at the Frascati e^+ e^- storage ring ADONE, is presented. The behaviour of the total cross section together with the proton electromagnetic time-like form factor is discussed in terms of a narrow vector resonance close to the nucleon-antinucleon threshold.
Antonelli et al. (Wed,) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: