General issues in small-x and diffractive physics
A.H. Mueller
Department of Physics, Columbia University, New York, N.Y. 10027, USA
Received: 3 November 1997
Abstract
A selected review of topics at the border of hard and
soft physics is given. Particular emphasis is placed on diffraction
dissociation at Fermilab and HERA. Recently, significant differences between
diffraction dissociation at HERA and at Fermilab have become apparent. This may
suggest that one already is reaching nonlinear (unitarity) effects which are
extending from the soft physics region into the semihard regime of QCD.
PACS
24. Nuclear reactions: general
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