A review of recent experimental and theoretical results on hyperon electromagnetic form factors in the timelike region, highlighting near-threshold final-state interactions.
Antiproton-Proton Channels in J/psi Decays
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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.
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Electromagnetic form factors of hyperons in the timelike region: A short review
A review of recent experimental and theoretical results on hyperon electromagnetic form factors in the timelike region, highlighting near-threshold final-state interactions.