Proton opacity in the light of LHC diffractive data

Details Proton opacity in the light of LHC diffractive data Proton opacity in the light of LHC diffractive data

2012-01-30

arxiv.org/abs/1201.6298v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, 6 figures. Version to be published in EPJC

Scientific paper

We show that collider data on elastic pp (and p\bar{p}) scattering, including the LHC TOTEM data at 7 TeV, can be well described by a 3-channel eikonal model with only one Pomeron, with parameters that are naturally linked to the perturbative QCD (BFKL) framework. The proton opacity, determined in this way, is then used to account for sizeable absorptive effects. We study the recent measurements of d\sigma/d\Delta\eta made by the ATLAS collaboration, where they select events with large rapidity gaps \Delta\eta. We demonstrate that the absorptive corrections noticeably change both the value and the \Delta\eta dependence of the cross section. We find that our parameter-free calculation is in agreement with these ATLAS data.

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