Observation of a resonant structure in $e^{+}e^{-} \to \omega\eta$ and another in $e^{+}e^{-} \to \omega\pi^{0}$ at center-of-mass energies between 2.00 and 3.08 GeV

TL;DR

This study measures the cross sections of $e^+e^- o ext{omega eta}$ and $e^+e^- o ext{omega pi0}$ between 2.00 and 3.08 GeV, discovering resonant structures consistent with $ ext{phi}(2170)$ and a new $Y(2040)$ resonance.

Contribution

First precise measurement of these processes revealing two resonant structures, including a new resonance, expanding understanding of vector meson states.

Findings

Resonance at 2179 MeV/c^2 consistent with $ ext{phi}(2170)$

Observation of a new $Y(2040)$ resonance with high significance

Improved precision over previous measurements

Abstract

Born cross sections for the processes $e^+e^- \to \omega\eta$ and $e^+e^- \to \omega\pi^{0}$ have been determined for center-of-mass energies between 2.00 and 3.08 GeV with the BESIII detector at the BEPCII collider. The results obtained in this work are consistent with previous measurements but with improved precision. Two resonant structures are observed. In the $e^{+}e^{-} \to \omega\eta$ cross sections, a resonance with a mass of $(2179 \pm 21 \pm 3)\text{MeV}/c^2$ and a width of $(89 \pm 28 \pm 5)\text{MeV}$ is observed with a significance of 6.1$\sigma$. Its properties are consistent with the $\phi(2170)$. In the $e^{+}e^{-} \to\omega\pi^{0}$ cross sections, a resonance denoted $Y(2040)$ is observed with a significance of more than 10$\sigma$. Its mass and width are determined to be $(2034 \pm 13 \pm 9)\text{MeV}/c^2$ and $(234 \pm 30 \pm 25)\text{MeV}$, respectively, where the first uncertainties are statistical and the second ones are systematic.