Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-11-19
Acta Phys.Polon. B30 (1999) 987-1000
Physics
High Energy Physics
High Energy Physics - Phenomenology
Scientific paper
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'.
Majewski Michal
Meshcheryakov G. V.
Meshcheryakov V. A.
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