Threshold effects as the origin of $Y(4500)$ observed in $e^+e^-\to J/\psi K^+K^-$

TL;DR

This paper explains the observed $Y(4500)$ structure in $e^+e^- o J/mbda K^+K^-$ as a threshold effect caused by triangle singularities in rescattering processes, rather than a traditional resonance.

Contribution

It introduces a novel interpretation of $Y(4500)$ as a threshold effect from triangle singularities, incorporating $ ext{psi}(4415)$ states and $Z_{cs}^{( extprime)}$ resonances.

Findings

$Y(4500)$ is explained as a threshold effect, not a conventional resonance.

Triangle singularities in rescattering processes produce the $Y(4500)$ peak.

Analysis supports the threshold effect interpretation over resonance hypothesis.

Abstract

The BESIII collaboration has recently observed a resonant structure $Y(4500)$ in $e^{+}e^{-}\to J/\psi K^{+}K^{-}$, whose origin remains unresolved. In this study, we analyze the cross section line shape of $e^{+}e^{-}\to J/\psi K^{+}K^{-}$ by taking into account the $\psi(4415)$ state and intermediate charmed meson loops. By treating $\psi(4415)$ as both a pure $S$-wave state and $S$-$D$ mixed states, and introducing the $Z_{cs}^{(\prime)}$ resonance, we find that the $Y(4500)$ peak at $\sqrt{s}=4.5~\text{GeV}$ arises from the triangle singularity mechanism in the $Z_{cs}^{(\prime)}$-mediated rescattering processes, supporting its interpretation as a threshold effect rather than a conventional resonance.