On the structure of the X(1835) baryonium

Details On the structure of the X(1835) baryonium On the structure of the X(1835) baryonium

2009-04-14

arxiv.org/abs/0904.2163v2

Phys.Rev.C80:045207,2009

Physics

Nuclear Physics

Nuclear Theory

7 pages, 7 figures, this version corresponds to the published paper in Phys. Rev. C: minor corrections done and in section 5 s

Scientific paper

10.1103/PhysRevC.80.045207

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.

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