Large-t, triple-pomeron diffractive processes in QCD

In terms of perturbative QCD we calculate the basic features of high-mass ($M_X$) diffractive dissociation of hadrons at large momentum transfer t. We find that the distribution over 1-x=$M_X^2$/s should change from 1/(1-x) at small t to &/ ${\ln }^3$[1/(1-x)] at large t [where ${\omega }_0$=${\alpha }_S$(t)12 ln(2)/π], and that the gluon distribution in the Pomeron should flatten with increasing ‖t‖.