New measurement reveals total cross section behavior in hadron production, indicating resonance near threshold.
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.
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Antonelli et al. (1995) studied this question.
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