Abstract
The processes [Formula: see text] in the threshold domain are considered in the framework of the extended Nambu–Jona-Lasinio model. The channels with the ground [Formula: see text], [Formula: see text] and radially excited [Formula: see text], [Formula: see text] intermediate meson states are taken into account. It is shown that in the process [Formula: see text], the probability of the subprocesses with [Formula: see text]-mesons significantly exceeds the probability of the subprocesses with [Formula: see text]-mesons, whereas, in the process [Formula: see text], [Formula: see text]- and [Formula: see text]-channels give approximately equal contributions. The mechanism of this effect is discussed. The radiative decay widths of [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] are calculated.
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