QCD-Motivated Pomeron and High Energy Hadronic Diffractive Cross Sections

Soft diffractive cross sections in $pp$ (or $\bar pp$), $\pi p$ and $\gamma p$ collisions are calculated using QCD-motivated pomeron. The $s$-channel unitarization of the amplitude is performed by the eikonal approach, and in the framework of the quark structure of hadrons the colour screening is taken into account. The performed description of the diffractive processes has led to the parameters of the bare pomeron $P$ which occurred to be close to the corresponding parameters of the Lipatov's pomeron. Parameters of the bare pomeron and those of the three-reggeon block $PGG$ ($G$ is a reggeized gluon) has been fixed by the data at moderately high energies; for superhigh energies the predictions are made. The intercept of the bare pomeron is found to be in remarkable agreement with the low-$x$ data for deep inelastic scattering. An evaluation of the effective colour transparency radius is done which can be used in hadron-nuclei reactions.