Near threshold enhancement of the ppbar mass spectrum in J/Psi decay

Details Near threshold enhancement of the ppbar mass spectrum in J/Psi decay Near threshold enhancement of the ppbar mass spectrum in J/Psi decay

2004-11-30

arxiv.org/abs/hep-ph/0411386v1

Phys.Rev.D71:054010,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 7 figures

Scientific paper

10.1103/PhysRevD.71.054010

We investigate the nature of the near-threshold enhancement in the ppbar invariant mass spectrum of the reaction J/Psi -> gamma ppbar reported recently by the BES Collaboration. Using the Juelich NNbar model we show that the mass dependence of the ppbar spectrum close to the threshold can be reproduced by the S-wave ppbar final state interaction in the isospin I=1 state within the Watson-Migdal approach. However, because of our poor knowledge of the NNbar interaction near threshold and of the J/Psi -> gamma ppbar reaction mechanism and in view of the controversal situation in the decay J/Psi -> pi0 ppbar, where no obvious signs of a ppbar final state interaction are seen, explanations other than final state interactions cannot be ruled out at the present stage.

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