On the consistency of LEAR experimets and FENICE in the sector of $p\bar{p}$ interaction near the threshold

Abstract

Some experiments on LEAR obtained unusual behavior of the $p\bar{p}$ interaction near the threshold. The experiments on $p\bar{p}$ forvard scattering detected zeros and big variation of $\rho$ and at the same time a smooth rising of ${\sigma }_{tot}$ with lowing energy. Many models has difficulties in explanating this fact. In the PS170 experiment with a good statistical accuracy the unexpected behavior of the proton electromagnetic form factor was found. All these experiments can be considered as an indication for the existence of a low lying $p\bar{p}$ bound state 'baryonium'. This statement coincides with that made for interpretation of the energy dependence of the total cross-section $e^{+}{e}^{-}\to hadrons$ in FENICE. There is a model (based on analyticity) which explained aforementioned experiments and the fact that this 'baryonium' is not seen in the OBELIX $p\bar{p}$ annihilation cross-section. Thus LEAR experiments and FENICE one are consistent near $p\bar{p}$ threshold and compatible with the existence of 'baryonium'.