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Measurement of inelastic, single- and double-diffraction cross sections in proton--proton collisions at the LHC with ALICE

The ALICE collaboration
Eur.Phys.J.C 73 (2013) 2456, 2013.

Abstract (data abstract)
CERN-LHC. Measurements of cross sections of inelastic and diffractive processes in proton--proton collisions at LHC energies were carried out with the ALICE detector. The fractions of diffractive processes in inelastic collisions were determined from a study of gaps in charged particle pseudorapidity distributions: for single diffraction (diffractive mass $M_X < 200$ GeV/$c^2$) $\sigma_{\rm SD}/\sigma_{\rm INEL} = 0.21 \pm 0.03, 0.20^{+0.07}_{-0.08}$, and $0.20^{+0.04}_{-0.07}$, respectively at centre-of-mass energies $\sqrt{s} = 0.9, 2.76$, and 7 TeV; for double diffraction (for a pseudorapidity gap $\Delta\eta > 3$) $\sigma_{\rm DD}/\sigma_{\rm INEL} = 0.11 \pm 0.03, 0.12 \pm 0.05$, and $0.12^{+0.05}_{-0.04}$, respectively at $\sqrt{s} = 0.9, 2.76$, and 7 TeV. To measure the inelastic cross section, beam properties were determined with van der Meer scans, and, using a simulation of diffraction adjusted to data, the following values were obtained: $\sigma_{\rm INEL} = 62.8^{+2.4}_{-4.0} (model) \pm 1.2 (lumi)$ mb at $\sqrt{s} =$ 2.76 TeV and $73.2^{+2.0}_{-4.6} (model) \pm 2.6 (lumi)$ mb at $\sqrt{s}$ = 7 TeV. The single- and double-diffractive cross sections were calculated combining relative rates of diffraction with inelastic cross sections. The results are compared to previous measurements at proton--antiproton and proton--proton colliders at lower energies, to measurements by other experiments at the LHC, and to theoretical models. Data taken from the RIVET analysis code.

  • Table 1

    Data from ?


    Production ratios of SD with $M_{X} < 200 GeV/c^2$ to INEL.

  • Table 2

    Data from ?


    Production ratios of DD with $\Delta\eta >3$ to INEL.

  • Table 3

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    Single diffraction cross-section for $M_{X} < 200 GeV/c^2$.

  • Table 4

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    Double diffraction cross-section for $\Delta\eta > 3$.

  • Table 5

    Data from ?


    Inelastic cross-section.

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