Measurement of the Radiative Width of theη′in Two-Photon Interaction at SPEAR

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Abstract

Events of the type ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}{\ensuremath{\eta}}^{\ensuremath{'}}(958)$ have been observed with the Mark II detector at SPEAR by detecting the decay mode ${\ensuremath{\eta}}^{\ensuremath{'}}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{0}\ensuremath{\gamma}$. From the observed cross section and known branching fractions of the ${\ensuremath{\eta}}^{\ensuremath{'}}$ is ${\ensuremath{\Gamma}}_{\ensuremath{\gamma}\ensuremath{\gamma}}=5.9\ifmmode\pm\else\textpm\fi{}1.6\ifmmode\pm\else\textpm\fi{}1.2$ keV and the total width is $\ensuremath{\Gamma}=300\ifmmode\pm\else\textpm\fi{}90\ifmmode\pm\else\textpm\fi{}60$ keV (statistical and systematic errors).

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