Measurement of elastic scattering in antiproton-proton collisions at 52.8 GeV centre-of-mass energy

The authors measured the differential cross section for pp and pp elastic scattering in the momentum-transfer range 0.010.09 GeV/sup 2/, b/sub pp/=10.68+or-0.26 GeV/sup -2/. Using the optical theorem, they obtained the total cross section sigma /sub tot/(pp) =44.86+or-0.78 mb and, by integrating the differential cross section, the total elastic cross section sigma /sub el/(pp)=7.89+or-0.28 mb. Calculations of sigma /sub tot/ combining elastic-rate and total-rate measurements are also given. All of these measurements were also performed for pp scattering at the same energy, and the results for both reactions are compared