2004/11/30 by A. Sibirtsev, J. Haidenbauer, S. Krewald +2 · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #hep-ph #nucl-th
paper · pdf · doi:10.1103/physrevd.71.054010
published as Phys.Rev.D71:054010,2005 · 9 pages, 7 figures
arxiv created 2004/11/30 · openalex publication_date 2005/03/07 · arxiv updated 2009/12/01 · openalex created_date 2017/03/16 · openalex updated_date 2026/08/05
We investigate the nature of the near-threshold enhancement in the pp invariant-mass spectrum of the reaction J/\ensuremathΨ\ensuremath→\ensuremathγpp reported recently by the BES Collaboration. Using the J"ulich NN model we show that the mass dependence of the pp spectrum close to the threshold can be reproduced by the S-wave pp final state interaction in the isospin I=1 state within the Watson-Migdal approach. However, because of our poor knowledge of the NN interaction near-threshold and of the J/\ensuremathΨ\ensuremath→\ensuremathγpp reaction mechanism and in view of the controversal situation in the decay J/\ensuremathΨ\ensuremath→\ensuremathπ0pp, where no obvious signs of a pp final state interaction are seen, explanations other than final state interactions cannot be ruled out at the present stage.