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Type: Journal article
Title: Rapidity gap cross sections measured with the ATLAS detector in pp collisions at √s = 7 TeV
Other Titles: Rapidity gap cross sections measured with the ATLAS detector in pp collisions at root s = 7 TeV
Author: Aad, G.
ATLAS Collaboration
Citation: The European Physical Journal C, 2012; 72(3):1926-1-1926-31
Publisher: Springer
Issue Date: 2012
ISSN: 1434-6044
Statement of
G. Aad ... P. Jackson ... L. Lee ... A. Petridis ... N. Soni ... M.J. White ... et al. (ATLAS Collaboration)
Abstract: Pseudorapidity gap distributions in proton-proton collisions at s√=7 ~TeV are studied using a minimum bias data sample with an integrated luminosity of 7.1 μb⁻¹. Cross sections are measured differentially in terms of ΔηF, the larger of the pseudorapidity regions extending to the limits of the ATLAS sensitivity, at η = ±4.9, in which no final state particles are produced above a transverse momentum threshold pcutT. The measurements span the region 0<ΔηF<8 for 200~MeV<pcutT<800~MeV. At small ΔηF, the data test the reliability of hadronisation models in describing rapidity and transverse momentum fluctuations in final state particle production. The measurements at larger gap sizes are dominated by contributions from the single diffractive dissociation process (pp→Xp), enhanced by double dissociation (pp→XY) where the invariant mass of the lighter of the two dissociation systems satisfies MY≲7 GeV. The resulting cross section is dσ/dΔηF≈1 mb for ΔηF≳3. The large rapidity gap data are used to constrain the value of the Pomeron intercept appropriate to triple Regge models of soft diffraction. The cross section integrated over all gap sizes is compared with other LHC inelastic cross section measurements.
Rights: © CERN for the benefit of the ATLAS Collaboration 2012. This article is published with open access at This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.
RMID: 0030020254
DOI: 10.1140/epjc/s10052-012-1926-0
Appears in Collections:Physics publications

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