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Observation of the first iso-spin Charmonium-like State $Z_c(4020)$ }

In this paper, we present a new experimental progress in brief on the recent observation of the charged charmonium-like state Z_c(4020)^{+/-} states and its iso-spin partner Z_c(4020)^{0} in pi pi hc process at the BESIII experiment. The charged Z_{c}(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 Z_{c}(4020) the first iso-spin triplet Z_{c} state observed in experiment.

preprint2015arXivOpen access
Qing-Ping JiYu-Ping GuoAi-Qiang GuoChun-Xu YuZhi-Yong Wang
hep-ex
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Qing-Ping JiYu-Ping GuoAi-Qiang GuoChun-Xu YuZhi-Yong Wang

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