Measurement of differential cross sections for single diffractive dissociation in $\sqrt{s}=8$ TeV $pp$ collisions using the ATLAS ALFA spectrometer

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, $pp\to Xp$. 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 $0.016<|t|<0.43\mathrm{Ge}{\mathrm{V}}^2$, 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 $1.59\pm 0.13\mathrm{mb}$. 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, $\mathrm{d}\sigma /\mathrm{d}t\propto {\text{e}}^{Bt}$ with slope parameter $B=7.65\pm 0.34\mathrm{Ge}{\mathrm{V}}^{-2}$. Interpreted in the framework of triple Regge phenomenology, the $\xi$ dependence leads to a pomeron intercept of $\alpha (0)=1.07\pm 0.09$.

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

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