Summary
To bring theory and experiments into more satisfactory agreement in the much studied pion form factor, and also in the kaon and nucleon form factors, especially in the timelike region, we assume the existence of a third radial excitation of ρ(770) at a mass of\(m_{p^m } \)=2150 MeV and width\(\Gamma _{p^m } \)=320 MeV. We interpretp m therefore as one of the structures in the total cross-section of e+ e− annihilation into hadrons around the nucleon-antinucleon threshold. If the collected statistics is high enough, this resonance would be observable in the on-going FENICE experiment at Frascati, designed to investigate baryon form factors. There is thus an additional exciting challenge for FENICE.
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Biagini, M.E., Dubnicka, S., Etim, E. et al. Phenomenological evidence for a third radial excitation of ρ(770). Nuov Cim A 104, 363–369 (1991). https://doi.org/10.1007/BF02799144
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DOI: https://doi.org/10.1007/BF02799144