Hadronic Diffraction: Where do we Stand?

Details Hadronic Diffraction: Where do we Stand? Hadronic Diffraction: Where do we Stand?

2004-07-02

arxiv.org/abs/hep-ph/0407035v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, Presented at Les Rencontres de Physique de la Valle d'Aoste, La Thuile, Aosta Valley, Italy, February 29 - March 6,

Scientific paper

Experimental results on hadronic soft and hard diffractive processes are reviewed with emphasis on aspects of the data that point to the underlying QCD mechanism for diffraction. Diffractive differential cross sections are shown to be factorized into two terms, one representing the total cross section at the reduced energy, corresponding to the rapidity region(s) in which there is particle production, and another interpreted as the probability of formation of the rapidity gap(s) characterizing diffraction. By (re)normalizing the term of gap formation probability to unity, cross sections for single, central, and multiple rapidity gap soft diffraction, as well as structure functions for hard diffraction processes, are obtained from the underlying inclusive parton distribution functions. A unified partonic picture emerges, in which diffraction appears to be mediated by the exchange of low-x partons subject to color constraints.

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