Abstract
Indications of the existence of quasi-bound states in the \(N {\overline N}\) system are presented. In their measurements, the BES collaboration has discoverd a broad enhancement close to the \(p {\overline p}\) threshold in the S wave, isospin 0 state formed in radiative decays of J/ψ. Another enhancement located about 50 MeV below the threshold was found in mesonic decays of J/ψ. In terms of the Paris potential model it was shown that these are likely to represent the same state. Antiprotonic atomic data provide some support for this interpretation and indicate the existence of another fairly narrow quasi-bound state in a P wave.
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Proceedings of the International Conference on Exotic Atoms and Related Topics (EXA 2014), Vienna, Austria, 15-19 September
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Wycech, S., Dedonder, JP. & Loiseau, B. Baryonium, a common ground for atomic and high energy physics. Hyperfine Interact 234, 141–148 (2015). https://doi.org/10.1007/s10751-015-1150-z
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DOI: https://doi.org/10.1007/s10751-015-1150-z