Decay φ(1020) → γf0(980): Analysis in the nonrelativistic quark model approach

AbstractWe demonstrate the possibility of a good description of the processes φ(1020) → γππ and φ(1020) → γf0(980) within the framework of the nonrelativistic quark model assuming f0(980) to be a dominantly quark-antiquark system. Different mechanisms of the radiative decay, that is, the emission of a photon by the constituent quark (additive quark model) and charge-exchange current, are considered. We also discuss the status of the threshold theorem applied to the studied reactions, namely, the behavior of the decay amplitude at Mππ→mφ and $$m_{f_o } \to m_\phi $$ . In conclusion, the arguments favoring the $$q\bar q$$ origin of f0(980) are listed.