One-pion-exchange final-state interaction and thepp¯near threshold enhancement inJ/ψ→γpp¯decays

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Abstract

For the $N\overline{N}$ system, the one-pion-exchange (OPE) interaction gives the largest attractive force for $N\overline{N}$ with an isospin $I=0$ and spin $S=0,$ while a near-threshold enhancement was observed for $p\overline{p}$ with $I=0$ and $S=0$ in $J/\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\psi}}\ensuremath{\gamma}p\overline{p}$ decays. With a K-matrix approach, we find that the OPE final-state interaction makes an important contribution to the near-threshold enhancement in the $p\overline{p}$ mass spectrum in $J/\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\psi}}\ensuremath{\gamma}p\overline{p}$ decays.

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