Measurement of the total cross section from elastic scattering in pp collisions at √s=7 TeV with the ATLAS detector

ATLAS Collaboration

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125 Citations (Scopus)

Abstract

A measurement of the total pp cross section at the LHC at s=7 TeV is presented. In a special run with high-β beam optics, an integrated luminosity of 80 μb−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 |t| range from 0.01 GeV2 to 0.1 GeV2 to extrapolate to |t|→0, the total cross section, σtot(pp→X), is measured via the optical theorem to be: σtot(pp→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 |t|→0. In addition, the slope of the elastic cross section at small |t| is determined to be B=19.73±0.14(stat.)±0.26(syst.) GeV−2.

Original languageEnglish
Pages (from-to)486-548
Number of pages63
JournalNuclear Physics B
Volume889
DOIs
Publication statusPublished - 2014 Dec

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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