Proton opacity in the light of LHC diffractive data

M.G. Ryskin; A.D. Martin; V.A. Khoze

doi:10.1140/epjc/s10052-012-1937-x

EPJ

Proton opacity in the light of LHC diffractive data

M.G. Ryskin¹^,2^*, A.D. Martin¹^** and V.A. Khoze¹^,2^***

¹ Institute for Particle Physics Phenomenology, University of Durham, Durham, DH1 3LE, UK
² Petersburg Nuclear Physics Institute, NRC Kurchatov Institute, Gatchina, St. Petersburg, 188300, Russia

Received: 2 February 2012
Published online: 3 April 2012

Abstract

We show that collider data on elastic pp (and

) 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 dσ/dΔη made by the ATLAS collaboration, where they select events with large rapidity gaps Δη. We demonstrate that the absorptive corrections noticeably change both the value and the Δη dependence of the cross section. We find that our parameter-free calculation is in agreement with these ATLAS data.

Article contents