Measurement of differential cross sections for single diffractive dissociation in √s=8 TeV pp collisions using the ATLAS ALFA spectrometer



Aad, G, Abbott, B, Abbott, DC, Abud, A Abed, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H
et al (show 2922 more authors) (2020) Measurement of differential cross sections for single diffractive dissociation in √s=8 TeV pp collisions using the ATLAS ALFA spectrometer JOURNAL OF HIGH ENERGY PHYSICS, 2020 (2). 042-. ISSN 1126-6708, 1029-8479

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Abstract

A dedicated sample of Large Hadron Collider proton-proton collision data at centre-of-mass energy s = 8 TeV is used to study inclusive single diffractive dissociation, pp → X p. The intact final-state proton is reconstructed in the ATLAS ALFA forward spectrometer, while charged particles from the dissociated system X are measured in the central detector components. The fiducial range of the measurement is −4.0 < log<inf>10</inf>ξ < −1.6 and 0.016 < |t| < 0.43 GeV<sup>2</sup>, where ξ is the proton fractional energy loss and t is the squared four-momentum transfer. The total cross section integrated across the fiducial range is 1.59 ± 0.13 mb. Cross sections are also measured differentially as functions of ξ, t, and ∆η, a variable that characterises the rapidity gap separating the proton and the system X. The data are consistent with an exponential t dependence, dσ/dt ∝ e<sup>Bt</sup> with slope parameter B = 7.65 ± 0.34 GeV<sup>−2</sup>. Interpreted in the framework of triple Regge phenomenology, the ξ dependence leads to a pomeron intercept of α(0) = 1.07 ± 0.09. [Figure not available: see fulltext.]

Item Type: Article
Additional Information: 34 pages in total, author list starting page 18, 5 figures, 1 table, published in JHEP, v3 includes corrections detailed in the Erratum (JHEP 10 (2020) 182, https://doi.org/10.1007/JHEP10(2020)182). All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2018-01
Uncontrolled Keywords: Diffraction, Forward physics, Hadron-Hadron scattering (experiments), QCD
Depositing User: Symplectic Admin
Date Deposited: 02 Mar 2020 11:42
Last Modified: 22 May 2026 22:10
DOI: 10.1007/JHEP02(2020)042
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3076468
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