On the structure of the X(1835) baryonium
Abstract
The measurement by the BES collaboration of J/psi -> gamma p pbar decays indicates an enhancement at the p-pbar threshold. In another experiment BES finds a peak in the invariant mass of pi-mesons produced in the possibly related decay J/psi -> gamma pi+ pi- eta'. Using a semi-phenomenological potential model which describes all the N-Nbar scattering data, we show that the explanation of both effects may be given by a broad quasi-bound state in the spin and isospin singlet S wave. The structure of the observed peak is due to an interference of this quasi-bound state with a background amplitude and depends on the annihilation mechanism.
Keywords
Cite
@article{arxiv.0904.2163,
title = {On the structure of the X(1835) baryonium},
author = {J. -P. Dedonder and B. Loiseau and B. El-Bennich and S. Wycech},
journal= {arXiv preprint arXiv:0904.2163},
year = {2009}
}
Comments
7 pages, 7 figures, this version corresponds to the published paper in Phys. Rev. C: minor corrections done and in section 5 suggestions of experiments to confirm the link of the X(1835) to the antiproton-proton system