Abstract
Dielectron production in the πN interaction at not large energies is studied assuming that the electron- positron pair is produced from splitting of the virtual time-like photon. It allows us to get the interesting information on a nucleon form factor in the time-like region of four momentum transfer squared. The dominant contribution of the Δ-isobar creation in the intermediate state at incident pion momenta of about 0.3–0.4 GeV/c is shown. The experimental distributions over the angle and effective mass \({M_{{e^ + }{e^ - }}}\) of the e+e− pair are described satisfactorily. This stimulated us to present theoretical predictions for the \({M_{{e^ + }{e^ - }}}\) distribution in the process π−p → ne+e− at different incident momenta, which could be verified, for example, by the HADES experiments.
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Jerusalimov, A.P., Lykasov, G.I. Dielectron Production in Pion-Nucleon Reactions at Intermediate Energies. Phys. Part. Nuclei Lett. 15, 457–463 (2018). https://doi.org/10.1134/S1547477118050114
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DOI: https://doi.org/10.1134/S1547477118050114