Abstract.
Using a constituent-quark model we study possible bound or resonance N¯ states. The model fits the p¯ and p¯ cross-sections and explains the large 3 P 0 antiprotonium energy shift. Only a resonance is found in the 3 P 0 I = 0 partial wave. The threshold enhancement in the J/Ψ→γp¯ decay can be explained with FSI effects in S-waves and no N¯ bound state is needed.
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Entem, D.R., Fernández, F. X(1859) Baryonium or something else?. Eur. Phys. J. A 31, 649–652 (2007). https://doi.org/10.1140/epja/i2006-10209-3
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DOI: https://doi.org/10.1140/epja/i2006-10209-3