Observation of vector charmoniumlike states and search for $Z_{cs}$ in $e^+ e^- \to K^+ K^- J/\psi$ at BESIII

TL;DR

This paper reports the observation of new vector charmoniumlike states and a new decay mode in $e^+ e^- o K^+ K^- J/$ at BESIII, expanding understanding of exotic charmonium states.

Contribution

First observation of the decay mode $Y(4230) o K^+K^- J/$ and discovery of two new vector charmoniumlike states, $Y(4500)$ and $Y(4710)$, in the energy-dependent cross section.

Findings

Identification of a new decay mode $Y(4230) o K^+K^- J/$

First report of $Y(4500)$ and $Y(4710)$ states

Exploration of charged charmoniumlike states in $K^\u00b1 J/$ system

Abstract

We present the recent measurements of the $e^+e^-\to K^+K^- J/\psi$ process carried out by the BESIII experiment. A new decay mode $Y(4230)\to K^+K^- J/\psi$ is firstly identified by BESIII. Furthermore, two vector charmoniumlike states, $Y(4500)$ and $Y(4710)$, are reported for the first time in the energy-dependent line shape of $e^+e^-\to K^+K^- J/\psi$ cross section. In additon, an investigation of the $K^\pm J/\psi$ system is conducted to explore charged charmoniumlike states.