Rapidity gap survival in central exclusive diffraction: Dynamical mechanisms and uncertainties

Details Rapidity gap survival in central exclusive diffraction: Dynamical mechanisms and uncertainties Rapidity gap survival in central exclusive diffraction: Dynamical mechanisms and uncertainties

2008-12-05

arxiv.org/abs/0812.1053v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 3 figures. Proceedings of "HERA and the LHC" CERN-DESY Workshop, 2007-2008

Scientific paper

We summarize our understanding of the dynamical mechanisms governing rapidity gap survival in central exclusive diffraction, pp -> p + H + p (H = high-mass system), and discuss the uncertainties in present estimates of the survival probability. The main suppression of diffractive scattering is due to inelastic soft spectator interactions at small pp impact parameters and can be described in a mean-field approximation (independent hard and soft interactions). Moderate extra suppression results from fluctuations of the partonic configurations of the colliding protons. At LHC energies absorptive interactions of hard spectator partons associated with the gg -> H process reach the black-disk regime and cause substantial additional suppression, pushing the survival probability below 0.01.

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