Search for the process $e^+e^-\to \eta^\prime(958)$ with the CMD-3 detector

TL;DR

This paper reports a search for the process e+e- to eta'(958) using the CMD-3 detector, setting an upper limit on the product of its electronic width and decay branching fractions at a specific energy.

Contribution

First search for e+e- to eta'(958) with the CMD-3 detector, establishing an upper limit on the process's electronic width and decay probabilities.

Findings

Upper limit for the process at 0.00041 eV (90% C.L.)

No significant signal observed at the given energy

Provides constraints for theoretical models of eta' production

Abstract

A search for the process $\epem\to \eta^\prime(958)$ in the $\pipi\eta\to\pipi\gamma\gamma$ final state has been performed with the CMD-3 detector at the VEPP-2000 $e^+e^-$ collider. Using an integrated luminosity of 2.69 pb$^{-1}$ collected at the center-of-mass energy \Ecm = 957.68 MeV we set an upper limit for the product of electronic width and branching fractions $\Gamma_{\eta^\prime(958)\to\epem}\cdot\BR_{\eta^\prime(958)\to\pipi\eta}\cdot\BR_{\eta\to\gamma\gamma}<0.00041$ eV at 90\% C.L.