Observation of $e^+e^-\to \chi_{c0}\omega$ and missing higher charmonium $\psi(4S)$

TL;DR

This paper investigates the recent BESIII observation of $e^+e^- o \omega \chi_{c0}$, proposing that it can be explained by the missing higher charmonium state $\psi(4S)$, supported by meson loop calculations aligning with experimental data.

Contribution

The study provides a theoretical estimate of meson loop contributions to $\psi(4S) o \omega \\chi_{c0}$, suggesting the observed resonance is consistent with the missing $\\psi(4S)$ charmonium state.

Findings

Meson loop contributions can explain the BESIII observation.

The estimated branching ratio for $\\psi(4S) o \\eta J/\\psi$ is below $1.9 imes 10^{-3}$.

Theoretical results align with experimental data within reasonable parameters.

Abstract

Stimulated by the recent BESIII observation of a new resonance in $e^+ e^- \to \omega \chi_{c0}$ and by the fact that this state is consistent with our predicted $\psi(4S)$, in this work we estimate the meson loop contribution to $\psi(4S) \to \omega \chi_{c0}$. The evaluation indicates that our theoretical estimate can overlap with the experimental data in a reasonable parameter range. This fact shows that introduction of the missing higher charmonium $\psi(4S)$ provides a possible explanation to the recent BESIII observation. The upper limit of a branching ratio of $\psi(4S) \to \eta J/\psi$ is also predicted as $1.9 \times 10^{-3}$, which can be further tested by BESIII, Belle and forthcoming BelleII.