Baryonium, a common ground for atomic and high energy physics

Abstract

Indications of the existence of quasi-bound states in the N-Nbar system are presented. Measurements by BES discovered a broad enhancement close to the p-pbar threshold in the S wave, isospin 0 state formed in radiative decays of J/psi. Another enhancement located about 50 MeV below the threshold was found in mesonic decays of J/psi. 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.

arXiv comment6 pages, 6 figures - Contribution to EXA2014 Vienna to appear in a special edition of Hyperfine Interactions

References in corpus (6)

• Observation of a near-threshold enhancement in th p pbar mass spectrum from radiative J/psi-->gamma p pbar decays
• Observation of a resonance X(1835) in J/ψ--> γπ^+ π^- η^{\prime}
• Spin-Parity Analysis of ppbar Mass Threshold Structure in J/psi and psi' Radiative Decays
• Paris nucleon-antinucleon potential constrained by recent antiprotonic-atom data and antineutron-proton total cross sections
• Composition of the nuclear periphery from antiproton absorption
• Study of Jψdecaying into ωp \bar p

Cited by in corpus (1)

• Contribution of the non-resonant mechanism to the double and single differential distributions over the invariant variables in the reaction $e^{+}+e^{-}\to N+\bar{N}+{\pi }^0$