The {bar p}p differential elastic scattering cross section was measured at √{bar s} = 1800 GeV, using an improved accelerator luminosity determination and CDF small angle data in the range of 0.05 ≤ t ≤ 0.2(GeV/c)2. By extrapolating the differential cross sections to t=0 and using the optical theorem we obtain a total cross section of [sigma]{sub tot}({bar p}p) = 72.0 {plus minus} 3.6 mb. This result is preliminary in the sense that we expect to further reduce the systematic error on the optical point. 9 refs., 8 figs.

A measurement of the total pp cross section at the LHC at √s = 8 TeV is presented. An integrated luminosity of 500 [mu]b-1 was accumulated in a special run with high-[beta]* beam optics to measure the differential elastic cross section as a function of the Mandelstam momentum transfer variable t. Here, the measurement is performed with the ALFA sub-detector of ATLAS.

A measurement of the total pp cross section at the LHC at √s = 8 TeV is presented. An integrated luminosity of 500 ?b–1 was accumulated in a special run with high-?* beam optics to measure the differential elastic cross section as a function of the Mandelstam momentum transfer variable t. Here, the measurement is performed with the ALFA sub-detector of ATLAS.

A measurement of the total pp cross section at the LHC at √s = 7 TeV is presented. In a special run with high-?* beam optics, an integrated luminosity of 80 ?b–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.

A measurement of the total nuclear cross section, [sigma]{sub t}, the ratio of the real to the imaginary part of the forward nuclear elastic scattering amplitude, [rho], and the nuclear slope parameter, B, for {bar p}p elastic scattering at √{bar S} = 1.8 Te V, is presented. We find [sigma]{sub t} = 72.8 {plus minus} 3.1 mb, [rho] = 0.140 {plus minus} 0.69 and B = 16.99 {plus minus}.47 (GeV/c)−2. 5 refs., 13 figs., 2 tabs.