Abstract
The observation of the light hybrid candidate 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 hybrid nonet. Based on the flux tube model picture, the production and decay mechanisms for the hybrid nonet in the radiative decays into two pseudoscalar mesons are investigated. In the 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 are observed in the channel, we investigate two schemes of the nonet structure in which can either be the higher or lower mass state that strongly couples to . Possible channels for detecting the multiplets are suggested. In particular, a combined analysis of the hybrid production in , where and denote the light vector mesons and hybrid states, respectively, may provide further evidence for this nonet structure and ultimately establish these mysterious exotic species in the experiment.
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