Search for the process $e^+e^-\to \eta^\prime(958)$ with the CMD-3   detector
  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. 
R.R.Akhmetshin, A.V.Anisenkov, V.M.Aulchenko, V.Sh.Banzarov,   N.S.Bashtovoy, D.E.Berkaeva, A.E.Bondar, A.V.Bragin, S.I.Eide...
hep-ex