Aaboud, M.; Aad, G.; Abbott, B.; Bender, M.; Biebel, Otmar
(2016):
Measurement of the total cross section from elastic scattering in pp collisions at root s=8 TeV with the ATLAS detector.
In: Physics Letters B, Vol. 761: pp. 158178

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Abstract
A measurement of the total ppcross section at the LHC at root s = 8TeV is presented. An integrated luminosity of 500 mu b(1) was accumulated in a special run with highbeta* beam optics to measure the differential elastic cross section as a function of the Mandelstam momentum transfer variable t. The measurement is performed with the ALFA subdetector of ATLAS. Using a fit to the differential elastic cross section in the t range from 0.014 GeV2 to 0.1 GeV2 to extrapolate t > 0, the total cross section, sigma(tot)( pp > X), is measured via the optical theorem to be sigma(tot)(pp > X) = 96.07 +/ 0.18 (stat.) +/ 0.85 (exp.) +/ 0.31 (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 t > 0. In addition, the slope of the exponential function describing the elastic cross section at small t is determined to be B = 19.74 +/ 0.05 (stat.) +/ 0.23 (syst.) GeV2. (C) 2016 The Author. Published by Elsevier B.V.