Antiproton-Proton Channels in J/psi Decays

Details Antiproton-Proton Channels in J/psi Decays Antiproton-Proton Channels in J/psi Decays

2005-01-13

arxiv.org/abs/hep-ph/0501112v2

Phys.Rev.C72:011001,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 5 figures. The antiproton-proton pair being in isospin one in the J/Psi decay into neutral pion-antiproton-proton, th

Scientific paper

10.1103/PhysRevC.72.011001

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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