Measurement of the Total Cross Section and -parameter from Elastic Scattering in Collisions at √s = 13 TeV with the ATLAS Detector

The elastic scattering of protons at 13 TeV is measured in the range of protons transverse momenta allowing access to the Coulomb-Nuclear-Interference region. The data were collected thanks to dedicated special LHC beta* = 2.5 km optics. The total cross-section and rho-parameter, the ratio of the real to imaginary part of the forward elastic scattering amplitude, are measured and compared to various models and to results from other experiments. An overview of the analysis results will be presented as well as a comparison of obtained measurements with available World data and relevant model predictions.