Measurement of the $e^{+}e^{-}\rightarrow\omega\pi^{0}\pi^{0}$ cross section at center-of-mass energies from 2.0 to 3.08 GeV

TL;DR

This paper reports precise measurements of the $e^{+}e^{-} o ext{omega} ext{pi}^0 ext{pi}^0$ cross section across energies from 2.0 to 3.08 GeV, revealing a resonant structure near 2.20 GeV with detailed resonance parameters.

Contribution

First measurement of the $e^{+}e^{-} o ext{omega} ext{pi}^0 ext{pi}^0$ cross section over this energy range, identifying a new resonance with determined mass and width.

Findings

Resonant structure observed at ~2.20 GeV with >5σ significance.

Resonance parameters: mass = 2222 ± 7 ± 2 MeV/c², width = 59 ± 30 ± 6 MeV.

Cross section data provides new insights into hadronic interactions in this energy region.

Abstract

The cross section of the process $e^{+}e^{-}\to\omega\pi^{0}\pi^{0}$ is measured at nineteen center-of-mass energies from 2.0 to 3.08 GeV using data collected with the BESIII detector at the BEPCII storage ring. A resonant structure around 2.20 GeV is observed with statistical significance larger than $5\sigma$. Using a coherent fit to the cross section line shape, the mass and width are determined to be $M=2222\pm7\pm2~{\rm MeV}/c^2$ and $\varGamma=59\pm30\pm6~{\rm MeV}$, respectively, where the first uncertainties are statistical and the second ones are systematic.