# Antiproton-Proton Channels in $J/\psi$ Decays

Abstract : The recent measurements by the BES Collaboration of J/psi decays into a photon and a proton-antiproton pair indicate a strong enhancement at the proton-antiproton threshold not observed in the decays into a neutral pion and a proton-antiproton pair. Is this enhancement due to a proton-antiproton quasi-bound state or a baryonium? A natural explanation follows from a traditional model of proton-antiproton interactions based on G-parity transformation. The observed proton-antiproton structure is due to a strong attraction in the 1S0 state, and possibly to a near-threshold quasi-bound state in the 11S0 wave.
Document type :
Journal articles

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Submitted on : Friday, July 21, 2006 - 2:57:47 PM
Last modification on : Tuesday, January 25, 2022 - 12:48:11 PM

### Citation

B. Loiseau, S. Wycech. Antiproton-Proton Channels in $J/\psi$ Decays. Physical Review C, American Physical Society, 2005, 72, pp.011001. ⟨in2p3-00087178⟩

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