Rapidity gap cross sections measured with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV

Details Rapidity gap cross sections measured with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV Rapidity gap cross sections measured with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV

2012-01-13

arxiv.org/abs/1201.2808v2

Eur. Phys. J. C72 (2012) 1926

Physics

High Energy Physics

High Energy Physics - Experiment

21 pages plus author list (32 pages total), 10 figures, 2 tables, matches published version in EPJC

Scientific paper

10.1140/epjc/s10052-012-1926-0

Pseudorapidity gap distributions in proton-proton collisions at sqrt(s) = 7 TeV are studied using a minimum bias data sample with an integrated luminosity of 7.1 inverse microbarns. Cross sections are measured differentially in terms of Delta eta F, the larger of the pseudorapidity regions extending to the limits of the ATLAS sensitivity, at eta = +/- 4.9, in which no final state particles are produced above a transverse momentum threshold p_T Cut. The measurements span the region 0 < Delta eta F < 8 for 200 < p_T Cut < 800 MeV. At small Delta eta F, 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 M_Y <~ 7 GeV. The resulting cross section is d sigma / d Delta eta F ~ 1 mb for Delta eta F >~ 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.

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