Near threshold ppbar enhancement in the J/psi -> omega ppbar decay

Abstract

The near-threshold behavior of the ppbar invariant mass spectrum from the J/psi -> omega ppbar decay reported recently by the BES Collaboration is analyzed. Contrary to the statement made by the BES Collaboration itself our study demonstrates that there is indeed a noticeable enhancement in the ppbar invariant mass spectrum near threshold. Moreover, this enhancement is nicely reproduced by the final state interaction in the relevant 11S0 ppbar partial wave as given by the Julich nucleon--antinucleon model. Therefore, and again contrary to the statement by the BES Collaboration, their new data on J/psi -> omega ppbar decay in fact strongly support the FSI interpretation of the ppbar enhancement, seen also in other decay reactions.

arXiv comment3 pages, 2 figures

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• Threshold cusps and triangle singularities in hadronic reactions
• Dynamical generation of pseudoscalar resonances
• Reconciling the X(4630) with the Y(4660)
• On the near-threshold $\bar{p}p$ invariant mass spectrum measured in $J/\psi$ and ${\psi }^{\prime }$ decays
• The bound state problem of S-wave heavy quark meson-aitimeson systems
• Rescattering Effect and Near Threshold Enhancement of $p\bar{p}$ System
• Forward antiproton-deuteron elastic scattering and total spin-dependent antiproton-deuteron cross sections at intermediate energies
• A possible mechanism for producing the threshold enhancement in $J/\psi \to \gamma p\bar{p}$
• Looking for bound states and resonances in the ${\eta }^{\prime }K\bar{K}$ system
• Spin dependence of the antinucleon-nucleon interaction