Measurement of the total cross section from elastic scattering in pp collisions at root s=7 TeV with the ATLAS detector
Popovic, D. S.
Vranješ Milosavljević, Marija
ATLAS Collaboration (ukupan broj autora: 2901)
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A measurement of the total pp cross section at the LHC at root s = 7 TeV is presented. In a special run with high-beta* beam optics, an integrated luminosity of 80 mu b(-1) was accumulated in order to measure the differential elastic cross section as a function of the Mandelstam momentum transfer variable t. The measurement is performed with the ALFA sub-detector of ATLAS. Using a fit to the differential elastic cross section in the vertical bar t vertical bar range from 0.01 GeV2 to 0.1 GeV2 to extrapolate to vertical bar t vertical bar -- GT 0, the total cross section, sigma(tot)(pp -- GT X), is measured via the optical theorem to be: sigma(tot)(pp -- GT X) = 95.35 +/- 0.38 (stat.) +/- 1.25 (exp.) +/- 0.37 (extr.) mb, where the first error is statistical, the second accounts for all experimental systematic uncertainties and the last is related to uncertainties in the extrapolation to vertical bar t vertical bar -- GT 0. In addition, the slope of the elastic cross section at small ver...tical bar t vertical bar is determined to be B = 19.73 +/- 0.14 (stat.) +/- 0.26 (syst.) GeV-2. (C) 2014 The Authors. Published by Elsevier B.V.
Source:Nuclear Physics B, 2014, 889, 486-548
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