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

다국어 초록 (Multilingual 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<SUP>@?</SUP> beam optics, an integrated luminosity of 80 μb<SUP>-1</SUP> 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 GeV<SUP>2</SUP> to 0.1 GeV<SUP>2</SUP> to extrapolate to |t|→0, the total cross section, σ<SUB>tot</SUB>(pp→X), is measured via the optical theorem to be:σ<SUB>tot</SUB>(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<SUP>-2</SUP>.