Abstract
The processes [Formula: see text] and [Formula: see text] are calculated in the framework of the extended Nambu–Jona-Lasinio model. The intermediate vector mesons [Formula: see text], [Formula: see text], [Formula: see text] and their first radially excited states are taken into account. The obtained results are in satisfactory agreement with the experimental data. The predictions for the cross-sections of the reactions [Formula: see text], [Formula: see text] and [Formula: see text] were made.
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