The production of the f1(1285)γf1(1285)γ and a1(1260)γ in colliding e+e−-beams in threshold domain
Abstract
The processes e+e−→(f1(1285),a1(1260))γ in the threshold domain are considered in the framework of the extended Nambu–Jona-Lasinio model. The channels with the ground ρ(770), ω(782) and radially excited ρ(1450), ω(1420) intermediate meson states are taken into account. It is shown that in the process e+e−→f1(1285)γ, the probability of the subprocesses with ρ-mesons significantly exceeds the probability of the subprocesses with ω-mesons, whereas, in the process e+e−→a1(1260)γ, ρ- and ω-channels give approximately equal contributions. The mechanism of this effect is discussed. The radiative decay widths of ρ(1450)→f1(1285)γ, ω(1420)→f1(1285)γ, ρ(1450)→a1(1260)γ and ω(1420)→a1(1260)γ are calculated.
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