1998/12/03 by T. D. Blokhintseva, T.D. Blokhintseva, M. Nagy +4
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Nuclear physics research studies #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9812241
15 pages, LaTex; An extended version of the talk given at the International Conference HADRON STRUCTURE'98 (Stara Lesna, High Tatra Mountains, Slovak Republic; September 7-13, 1998)
arxiv created 1998/12/03 · openalex publication_date 1998/12/03 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The process πN→ e+e- N (IPE), being a natural and unique laboratory for studying the hadron electromagnetic structure in the sub-NN-threshold time-like region of the virtual-photon ``mass'' λ2, 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 F1v(λ2) and pseudoscalar GP(t) form-factors of a nucleon are presented, where an indication of the existence of the state π^\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.