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Observation of Zc (3900)0 in e+e- →π0π0J/ψ
(American Physical Society, 2015-09-11)
Using a data sample collected with the BESIII detector operating at the BEPCII storage ring, we observe a new neutral state Zc(3900)0 with a significance of 10.4σ. The mass and width are measured to be 3894.8±2.3±3.2MeV/c2 ...