Hidden-Charm Decays: An Elegant Probe for Internal Structure

Hadronic transitions are important decay modes of heavy quarkonia and serve as an elegant probe for the internal structure. Several remarkable discoveries have been made to identify the conventional heavy quarkonia and to extract useful information about the so called “XYZ” exotic states. We studied the hadronic transitions of higher charmonia in the framework of our recently proposed effective model to create light meson(s) in heavy quarkonium transitions. In this contribution, we discuss our results for the charmonium-η decays of higher S and D wave vector charmonia. We also discuss quantum number (2S+1L J) assignments for few experimentally observed charmoniumlike states.