Radiative and Meson Decays of Y(4230) in Flavor SU(3)

The charmonium-like exotic states Y(4230) and the less known Y(4320), produced in e(+)e(-) collisions, are sources of positive parity exotic hadrons in association with photons or pseudoscalar mesons. We analyze the radiative and pion decay channels in the compact tetraquark scheme, with a method that proves to work equally well in the most studied D* -> gamma/pi + D decays. The decay of the vector Y into a pion and a Z(c) state requires a flip of charge conjugation and isospin that is described appropriately in the formalism used. Rates are found to depend on the fifth power of pion momentum, which would make the final states pi Z(c)(4020) strongly suppressed with respect to pi Z(c)(3900). The agreement with BES III data would be improved considering the pi Z(c)(4020) events to be fed by the tail of the Y(4320) resonance under the Y(4230). These results should renovate the interest in further clarifying the emerging experimental picture in this mass region.

Automated summary

This study examines the charmonium-like exotic states Y(4230) and Y(4320) produced in e(+)e(-) collisions, focusing on their radiative and pion decay channels. The results show that decay rates depend on the fifth power of pion momentum, leading to a strong suppression of pi Zc(4020) relative to pi Zc(3900), and suggest the possible contribution of Y(4320) to pi Zc(4020) events based on BES III data.