The production of the f(1)(1285)gamma and a(1)(1260)gamma in colliding e(+) e(-)-beams in threshold domain

摘要

The processes e(+) e(-) -> (f(1)(1285), a(1)(1260))gamma in the threshold domain are considered in the framework of the extended Nambu-Jona-Lasinio model. The channels with the ground rho(770), omega(782) and radially excited rho(1450), omega(1420) intermediate meson states are taken into account. It is shown that in the process e+ e- -> f(1)(1285)gamma , the probability of the subprocesses with w-mesons significantly exceeds the probability of the subprocesses with w-mesons, whereas, in the process e(+) e(-) -> a(1)(1260)gamma, rho- and w-channels give approximately equal contributions. The mechanism of this effect is discussed. The radiative decay widths of rho(1450) -> f(1)(1285)gamma, omega(1420) -> f(1)(1285)gamma, rho(1450) -> a(1)(1260)gamma and omega(1420) -> a(1)(1260)gamma are calculated.