Cross section measurement of $e^{+}e^{-}\rightarrow \pi^{0}\pi^{0}\psi(3686)$ from $\sqrt{s}=$ 4.008 GeV to 4.951 GeV

TL;DR

This study measures the cross sections of the process $e^{+}e^{-} o \u03c8(3686)$ across a range of energies, confirming isospin symmetry and identifying significant resonances consistent with previous findings.

Contribution

First measurement of the $e^{+}e^{-} o 8(3686)$ cross sections over a broad energy range, with analysis of resonance parameters aligned with prior results.

Findings

Cross sections are about half of those for charged pion channels.

Observation of $Y(4390)$ and $Y(4660)$ with significance > 5σ.

Resonance parameters agree with previous measurements.

Abstract

Using data samples with a total integrated luminosity of $22.1~\rm fb^{-1}$ at center-of-mass energies between 4.008 and 4.951~GeV collected with the BESIII detector, the cross sections of $e^{+}e^{-}\rightarrow \pi^{0}\pi^{0}\psi(3686)$ process are measured. The obtained cross sections are found to be approximately one-half of those of $e^{+}e^{-}\rightarrow \pi^{+}\pi^{-}\psi(3686)$, consistent with the isospin symmetry expectation. A coherent fit to the dressed cross sections is performed, with the $Y(4230)$~parameters fixed at the values measured in $e^{+}e^{-}\rightarrow \pi^{+}\pi^{-}\psi(3686)$. The significances of the $Y(4390)$ and $Y(4660)$ are both larger than $5\sigma$, and their masses and widths are consistent with the previous measurement in the $e^{+}e^{-}\rightarrow \pi^{+}\pi^{-}\psi(3686)$ process.