X(1859) Baryonium or something else?
Nuclear Physics Group and IUFFyM, University of Salamanca, E-37008, Salamanca, Spain
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Accepted: 1 November 2006
Published online: 26 February 2007
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.
PACS: 12.39.Jh Non relativistic quark model – / 13.75.Cs Nucleon-nucleon interactions (including antinucleons, deuterons, etc.) – / 25.43.+t Antiproton-induced reactions – / 21.10.Dr Binding energies and masses –
© Società Italiana di Fisica and Springer-Verlag, 2007