DIFFRACTIVE PHENOMENA

Diffractive Phenomena at HERA

Diffractive Phenomena at Tevatron

Preliminary results from the DØ experiment on jet production with rapidity gaps in pp collisions are presented. A class of dijet events with a forward rapidity gap is observed at center-of-mass energies √ s = 1800 GeV and 630 GeV. The number of events with rapidity gaps at both center-of-mass energies is significantly greater than the expectation from multiplicity fluctuations and is consistent...

Experimental review of diffractive phenomena

The diffractive interaction is a feature of hadron-hadron scattering at high energy corresponding to a t-channel exchange of the vacuum quantum numbers and a small momentum transfer. It has been has been described, in the past, in the framework of Regge theory, where the exchange was interpreted as the Pomeron (IP ) trajectory, characterized by a weak energy dependence, in particular, with resp...

Soft Interactions and Diffractive Phenomena

Diffractive Phenomena at HERA 1

Highlights selected from recent measurements of colour-singlet exchange processes at HERA are summarised. Particular emphasis is placed on energy and momentum transfer dependences and the decomposition of the data into an expansion in Regge trajectories. The latest results in vector meson helicity analysis, partonic descriptions of hard diffraction and diffractive dijet production are also cove...