Lessons and puzzles of DIS at low x (high energy)
Abstract
This talk is a rather sceptical review of our knowledge and understanding of deep inelastic scattering at low x (high energy). We show that the well known success of the DGLAP evolution equations in describing of experimental HERA data brought more problems and puzzles than answers. We advocate that more systematic theoretical and experimental investigations of the nonperturbative QCD are needed to clarify physics of DIS at high energy.
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