ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2015, vol. 115, 11, p. -
Observation of Zc (3900)0 in e+e- →π0π0J/ψ
© 2015 American Physical Society.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±3.2 MeV/c2 and 29.6±8.2±8.2 MeV, respectively, where the first error is statistical and the second systematic. The Born cross section for e+e-→π0π0J/ψ and the fraction of it attributable to π0Zc(3900)0→π0π0J/ψ in the range Ec.m.=4.19-4.42 GeV are also determined. We interpret this state as the neutral partner of the four-quark candidate Zc(3900)±.