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

TL;DR

This paper reanalyzes the near-threshold ppbar enhancement in J/psi -> omega ppbar decay, confirming the enhancement and attributing it to final state interactions, thus supporting the FSI interpretation over previous claims.

Contribution

It demonstrates that the near-threshold ppbar enhancement is real and can be explained by final state interactions using the Julich nucleon-antinucleon model.

Findings

Confirmation of the ppbar enhancement near threshold.

Reproduction of the enhancement by the Julich FSI model.

Support for the FSI interpretation of the ppbar enhancement.

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.