Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-12-03
Physics
High Energy Physics
High Energy Physics - Phenomenology
15 pages, LaTex; An extended version of the talk given at the International Conference HADRON STRUCTURE'98 (Stara Lesna, High
Scientific paper
The process $\pi N\to e^+e^- N$ (IPE), being a natural and unique laboratory for studying the hadron electromagnetic structure in the sub-$N\bar{N}$-threshold time-like region of the virtual-photon ``mass'' $\lambda^2$, turns out to be also very useful for investigating the nucleon weak structure. A theoretical basis of the methods for extracting practically model-independent values of the electromagnetic hadron form factors in the time-like region and for determining the weak structure of the nucleon in the space-like region from experimental data on IPE at low energies is outlined. The results of extracting, by those methods, the electromagnetic $F_1^v(\lambda^2)$ and pseudoscalar $G_P(t)$ form-factors of a nucleon are presented, where an indication of the existence of the state $\pi^\p$ in the range 500-800 MeV (possibly the first radial excitation of pion) is obtained, and the coupling constant of this new state with the nucleon is estimated.
Blokhintseva T. D.
Nagy Máté
Surovtsev Yu. S.
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