Study ofψ(2S)decays toγpp¯,π0pp¯, andηpp¯, and search forpp¯threshold enhancements

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Abstract

The decays of $\ensuremath{\psi}(2S)$ into $\ensuremath{\gamma}p\overline{p}$, ${\ensuremath{\pi}}^{0}p\overline{p}$, and $\ensuremath{\eta}p\overline{p}$ have been studied with the CLEO-c detector using a sample of $24.5\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\psi}(2S)$ events obtained from ${e}^{+}{e}^{\ensuremath{-}}$ annihilations at $\sqrt{s}=3686\text{ }\text{ }\mathrm{MeV}$. The data show evidence for the excitation of several ${N}^{*}$ resonances in $p{\ensuremath{\pi}}^{0}$ and $p\ensuremath{\eta}$ channels in ${\ensuremath{\pi}}^{0}p\overline{p}$ and $\ensuremath{\eta}p\overline{p}$ decays, and ${f}_{2}$ states in $\ensuremath{\gamma}p\overline{p}$ decay. Branching fractions for decays of $\ensuremath{\psi}(2S)$ to $\ensuremath{\gamma}p\overline{p}$, ${\ensuremath{\pi}}^{0}p\overline{p}$, and $\ensuremath{\eta}p\overline{p}$ have been determined. No evidence for $p\overline{p}$ threshold enhancements was found in the reactions $\ensuremath{\psi}(2S)\ensuremath{\rightarrow}Xp\overline{p}$, where $X=\ensuremath{\gamma}$, ${\ensuremath{\pi}}^{0}$, $\ensuremath{\eta}$. We do, however, find confirming evidence for a $p\overline{p}$ threshold enhancement in $J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\gamma}p\overline{p}$ as previously reported by BES.

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