The shrinkage of the diffraction peak of the bare pomeron in QCD

Abstract

The new parameterQ0 is introduced in our integration over transverse momentaqt in perturbative QCD to avoid infrared divergencies. Consideringqt>Q0, the distribution of wee partons in impact parameter (bt) and the mean radius of interaction are calculated in the framework of the leading logarithmic approximation (LLA) of perturbative QCD. It is shown that the slope of the elastic amplitude increases as\(B \propto {{\sqrt {\alpha _s In s} } \mathord{\left/ {\vphantom {{\sqrt {\alpha _s In s} } {Q_0^2 }}} \right. \kern-\nulldelimiterspace} {Q_0^2 }}\).