The cross section of the process e+e−→ppˉe^+e^- \to p\bar{p} in the vicinity of charmonium ψ(3770)\psi(3770) including three-gluon and DD-meson loop contributions

The total cross section of the process $e^+e^- \to p\bar{p}$ is calculated within the energy range close to the mass of $\psi(3770)$ charmonium state. It was shown that the main contribution to this cross section comes from three gluon mechanism which is also responsible of the large phase with respect to the Born amplitude. This phase provides the characteristic dip behaviour of the cross section in contrast to the usual Breit-Wigner peak shape. OZI-allowed mechanism with D-mesons in the intermediate state was also estimated and gives relatively small contribution to the cross section and to the phase.Comment: 20 pages, 10 figure

About the creation of proton-anti-proton pair at electron-positron collider in the energy range of the mass Ψ(3770)\Psi(3770)

The process of electron--positron annihilation into proton--antiproton pair is considered within the vicinity of $\psi(3770)$ resonance. The interference between the pure electromagnetic intermediate state and the $\psi(3770)$ state is evaluated. It is shown that this interference is destructive and the relative phase between these two contributions is large ($\phi_0 \approx 250^o$).Comment: 16 pages, 6 figures. The authors included the long-range contributions (D-meson loop) in their calculations. The conclusion of the papers did not chang