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Observation of $Z_c(3900)^{0}$ in $e^+e^-\to\pi^0\pi^0 J/\psi$ · Around

2015

Observation of $Z_c(3900)^{0}$ in $e^+e^-\to\pi^0\pi^0 J/\psi$

BESIII Collaboration

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Using a data sample collected with the BESIII detector operating at the BEPCII storage ring, we observe a new neutral state $Z_c(3900)^{0}$ with a significance of $10.4\sigma$.

The mass and width are measured to be $3894.8\pm2.3\pm3.2$ MeV/$c^2$ and $29.6\pm8.2\pm8.2$~MeV, respectively, where the first error is statistical and the second systematic.
The Born cross section for $e^+e^-\to\pi^0\pi^0 J/\psi$ and the fraction of it attributable to $\pi^0 Z_c(3900)^{0}\to\pi^0\pi^0 J/\psi$ in the range $E_{cm}=4.19-4.42$ GeV are also determined.
We interpret this state as the neutral partner of the four-quark candidate $Z_c(3900)^\pm$.

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E c m E_{cm} values quoted in this Letter are nominal values based on the BEPCII accelerator control system, and true center-of-mass energies are lower by 2-3 MeV. This difference has a minimal effect on the analysis reported here and is treated as a systematic uncertainty

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