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, 02 (2). 042-.

[img] Text
Cross sections.pdf - Published version

Download (692kB) | Preview

Abstract

A dedicated sample of Large Hadron Collider proton-proton collision data at centre-of-mass energy $\sqrt{s}=8$ TeV is used to study inclusive single diffractive dissociation, $pp \rightarrow Xp$. 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 $-4.0 < \log_{10} \xi < -1.6$ and $0.016 < |t| < 0.43 \ {\rm GeV^2}$, where $\xi$ is the proton fractional energy loss and $t$ is the squared four-momentum transfer. The total cross section integrated across the fiducial range is $1.59 \pm 0.13 \ {\rm mb}$. Cross sections are also measured differentially as functions of $\xi$, $t$, and $\Delta \eta$, a variable that characterises the rapidity gap separating the proton and the system $X$. The data are consistent with an exponential $t$ dependence, ${\rm d} \sigma / {\rm d} t \propto \text{e}^{Bt}$ with slope parameter $B = 7.65 \pm 0.34 \ {\rm GeV^{-2}}$. Interpreted in the framework of triple Regge phenomenology, the $\xi$ dependence leads to a pomeron intercept of $\alpha(0) = 1.07 \pm 0.09$.

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: 18 Oct 2023 15:47
DOI: 10.1007/JHEP02(2020)042
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3076468