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High Energy Physics - Phenomenology

arXiv:hep-ph/0501112 (hep-ph)
[Submitted on 13 Jan 2005 (v1), last revised 16 Dec 2005 (this version, v2)]

Title:Antiproton-Proton Channels in J/psi Decays

Authors:B. Loiseau, S. Wycech
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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.
Comments: 6 pages, 5 figures. The antiproton-proton pair being in isospin one in the J/Psi decay into neutral pion-antiproton-proton, the antiproton-proton 1P1 and 3S1 waves have been replaced by the 31P1 and 33S1 ones and Figs. 1 and 2 have been replaced accordingly. Conclusions are unchanged. Most of the content of the paper is published in Phys. Rev. C72, 011001 (2005)
Subjects: High Energy Physics - Phenomenology (hep-ph)
Report number: LPNHE 2005-01
Cite as: arXiv:hep-ph/0501112
  (or arXiv:hep-ph/0501112v2 for this version)
  https://doi.org/10.48550/arXiv.hep-ph/0501112
Journal reference: Phys.Rev.C72:011001,2005
Related DOI: https://doi.org/10.1103/PhysRevC.72.011001

Submission history

From: Loiseau Benoit [view email]
[v1] Thu, 13 Jan 2005 19:13:34 UTC (201 KB)
[v2] Fri, 16 Dec 2005 09:34:21 UTC (202 KB)
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