## 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 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(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 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.)GeV−2.

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 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.)GeV−2.

Original language | English |
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Pages (from-to) | 158–178 |

Number of pages | 21 |

Journal | Physics Letters B |

Volume | 761 |

Early online date | 16 Aug 2016 |

DOIs | |

Publication status | Published - 10 Oct 2016 |