Towards the establishment of the light JP( C)=1-(+) hybrid nonet

The observation of the light hybrid candidate eta(1)(1855) by the BESIII Collaboration offers great opportunities for advancing our knowledge on exotic hadrons in terms of flavor sector. We demonstrate that this observation provides a crucial clue for establishing the J(P(C)) = 1(-(+)) hybrid nonet. Based on the flux tube model picture, the production and decay mechanisms for the J(P(C)) = 1(-(+)) hybrid nonet in the J/psi radiative decays into two pseudo-scalar mesons are investigated. In the I = 0 sector, we deduce that the SU(3) flavor octet and singlet mixing is non-negligible and apparently deviates from the flavor ideal mixing. Because only signals for one isoscalar eta(1)(1855) are observed in the eta eta' channel, we investigate two schemes of the nonet structure in which eta(1)(1855) can either be the higher or lower mass state that strongly couples to eta eta'. Possible channels for detecting the multiplets are suggested. In particular, a combined analysis of the hybrid production in J/psi -> VH, where V and H denote the light vector mesons and 1(-(+)) hybrid states, respectively, may provide further evidence for this nonet structure and ultimately establish these mysterious exotic species in the experiment.

Automated summary

The observation of the light hybrid candidate eta(1)(1855) by the BESIII Collaboration provides an important opportunity to advance our knowledge on exotic hadrons in terms of flavor sector. The study of its production and decay mechanisms can establish a crucial clue for the J(P(C)) = 1(-(+)) hybrid nonet.