Measurement of the $\boldsymbol{e^{+}e^{-}\to K^+K^-\psi(2S)}$ Cross Section at Center-of-Mass Energies from 4.699 to 4.951 GeV and Search for $\boldsymbol{Z_{cs}^{\pm}}$ in the $\boldsymbol{Z_{cs}^\pm\to K^\pm\psi(2S)}$ Decay

TL;DR

This paper measures the cross section of the process e+e- to K+K-ψ(2S) across energies from 4.699 to 4.951 GeV and searches for new Zcs± tetraquark states, finding no significant signals.

Contribution

First measurement of e+e- to K+K-ψ(2S) cross sections in the specified energy range and a search for Zcs± tetraquarks using BESIII data.

Findings

Measured cross sections at various energies.

No significant Zcs± signals observed.

Set upper limits on Zcs± production.

Abstract

We perform the first investigation of the process $e^{+}e^{-}\to K^+K^-\psi(2S)$ and report its Born cross sections over a range of center-of-mass energies from 4.699 to 4.951~GeV. The measurements are carried out using several partial reconstruction techniques using data samples collected by the BESIII detector with a total integrated luminosity of 2.5~fb$^{-1}$. We search for new tetraquark candidates $Z_{cs}^\pm$ in the decays $Z_{cs}^\pm\to K^\pm\psi(2S)$. No significant $Z_{cs}^\pm$ signals are observed.