Measurement of the total cross section from elastic scattering in pp collisions at √{ s} = 8 TeV with the ATLAS detector

Aaboud, M. and Aad, G. and Abbott, B. and Abdallah, J. and Abdinov, O. and Krasznahorkay, Attila and Pásztor, Gabriella and Tóth, József (2016) Measurement of the total cross section from elastic scattering in pp collisions at √{ s} = 8 TeV with the ATLAS detector. PHYSICS LETTERS B, 761. pp. 158-178. ISSN 0370-2693

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Abstract

A measurement of the total pp cross section at the LHC at √s = 8 TeV is presented. An integrated luminosity of 500 μb−1 was accumulated in a special run with high-β? beam op- tics to measure the differential elastic cross section as a function of the Mandelstam mo- mentum 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 −t range from 0.014 GeV2 to 0.1 GeV2 to extrapolate t → 0, the total cross section, σtot(pp → X), is measured via the optical theorem to be σtot(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 uncer- tainties 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.) GeV−2.

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