M. Majewski et al., On the consistency of LEAR and FENICE experiments in the sector of P(P)over-bar interaction near the threshold, ACT PHY P B, 30(4), 1999, pp. 987-1000
Some experiments at LEAR showed unusual behavior of the p (p) over bar inte
raction near the threshold. The experiments on p (p) over bar forward scatt
ering detected zeros and a big variation of rho and at the same time a smoo
th rising of sigma(tot) with lowering energy. Many models have difficulties
in explaining this fact. In the PS-170 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 th
e existence of a low-lying p (p) over bar bound state 'baryonium'. This sta
tement coincides with that made for interpreting of the energy dependence o
f the total cross-section of the reaction e(+)e(-) --> hadrons in FENICE. T
here is a model (based on analyticity) which explains afore-mentioned exper
iments and the fact that the 'baryonium' is not seen in the OBELIX p (p) ov
er bar annihilation cross-section. Thus, LEAR and FENICE experiments are co
nsistent near the p (p) over bar threshold and testify to the existence of
'baryonium'.