Resonant Parameters of Vector Charmonium-like States above 4.4 GeV

TL;DR

This paper analyzes the energy-dependent line shapes of various cross sections in electron-positron collisions to determine the properties of vector charmonium-like states above 4.4 GeV, revealing their dominant production mechanisms.

Contribution

It provides a simultaneous fit to multiple cross sections to extract masses and widths of resonances, offering new insights into the nature of these states.

Findings

Resonance parameters for $ ext{psi}(4230)$, $ ext{psi}(4500)$, $ ext{psi}(4660)$, $ ext{psi}(4710)$ are determined.

Processes involving $D_s$ and $ ext{phi} ext{chi}_c$ are mainly produced via $ ext{psi}(4660)$ and $ ext{psi}(4710)$ decays.

The analysis enhances understanding of the structure and decay mechanisms of vector charmonium-like states.

Abstract

We analysis the $\sqrt{s}$-dependent line shapes of the $e^+e^-\to D_s^{+}D_{s1}^{*-}(2536)$, $D_s^{+}D_{s2}^{*-}(2573)$, $\phi\chi_{c1,2}$, $K^+K^-J/\psi$, $K_S^0 K_S^0 J/\psi$, and $K^+K^-\psi(2S)$ cross sections measured by the BESIII experiment using the four resonant structures $\psi(4230)$, $\psi(4500)$, $\psi(4660)$, and $\psi(4710)$, by performing a simultaneous $\chi^2$-minimized fit. Their masses and widths are obtained. We find that the processes $e^+e^-\to D_s^{+}D_{s1}^{*-}(2536)$, $e^+e^-\to D_s^{+}D_{s2}^{*-}(2573)$, and $e^+e^-\to \phi\chi_{c1,2}$ are all dominantly produced via the $\psi(4660)$ and $\psi(4710)$ decays.