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VOLUME 28 (1978) | ISSUE 3 | PAGE 183
Electromagnetic form factor of the nucleon in the timelike region
A mechanism is proposed for dynamic enhancement of the electromagnetic form factor of the nucleon in the timelike region of momentum transfers q1 close to the threshold of the production of the NN pair. The large nucleon form factor measured in experiments on the annihilation of slow antiprotons into an e +e ~ pair [G. Bassmpierre et al., CERN Preprint, 1977] will be shown to be caused by the strong t -channel interaction between ρ and ρ in the initial state. By way of consequence of this proposed model, a sharp increase is predicted for the quantity R = σΗαά/σμμ in e+e annihilation in the region Ss4m2 (m is the nucleon mass).