Observation of the first iso-spin Charmonium-like State Zc(4020)
Abstract
In this paper, we present a new experimental progress in brief on the recent observation of the charged charmonium-like state Zc(4020)+/- states and its iso-spin partner Zc(4020)0 in pi pi hc process at the BESIII experiment. The charged Zc(4020) is its decay into π+/- hc final state, and carries electric charge, thus it contains at least four quarks. The observation of both charge and neutral state makes Zc(4020) the first iso-spin triplet Zc state observed in experiment.
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