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

Abstract

© 2016 The AuthorA 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 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 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, is measured via the optical theorem to beσtot=96.07±0.18±0.85±0.31mb, 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±0.23GeV−2.

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Author Profiles

Roger Abreu
Ashford University
Briana Abbott
Ball State University

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