Measurement of $e^{+}e^{-} \to π^{0}π^{0}ψ(3686)$ at $\sqrt{s}$ from 4.009 to 4.600 GeV and observation of a neutral charmoniumlike structure

Abstract

Using e+e− collision data collected with the BESIII detector at the BEPCII collider corresponding to an integrated luminosity of 5.2 fb−1 at center-of-mass energies (s) from 4.009 to 4.600 GeV, the process e+e−→π0π0ψ(3686) is studied for the first time. The corresponding Born cross sections are measured and found to be half of those of the reaction e+e−→π0π0ψ(3686). This is consistent with the expectation from isospin symmetry. Furthermore, the Dalitz plots for π0π0ψ(3686) are accordant with those of π0π0ψ(3686) at all energy points, and a neutral analogue to the structure in π±ψ(3686) around 4040 MeV/c2 first observed at s=4.416 GeV is observed in the isospin neutral mode at the same energy.