Nonlinear Phenomena in Complex Systems, 2009, Vol.12, No.4, pp.395-402

NONLINEAR PHENOMENA IN COMPLEX SYSTEMS
An Interdisciplinary Journal

2009, Vol.12, No.4, pp.395-402

Inclusive Diffraction at HERA.
Armen Bunyatyan

The high centre-of-mass energies of the HERA ep collider allow us to study the diffractive interactions in the presence of a hard scale and to describe them in terms of perturbative QCD. In QCD, the diffractive exchange is described in terms of partons, and the factorisation theorem states that the cross section for hard interactions can be expressed as convolution of universal diffractive parton distribution functions and process-dependent coefficients, perturbatively calculable. In this report the recent experimental data from the H1 and ZEUS Collaborations at HERA of inclusive processes and hadronic final states in diffractive interactions are presented. The data are used to investigate the factorisation properties and study the partonic structure of colour singlet exchange.
Key words: diffraction, structure functions, jets, factorisation

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