| Precision Measurements of Antiproton-Proton Forward Elastic Scattering Parameters in the 3.7 to 6.2 GeV/c Region (2007) | |||||||||||||
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| Differential cross sections for ¯ pp elastic scattering have been measured for very small momentum transfers at six different incident antiproton momenta in the range 3.7 to 6.2 GeV/c by the detection of recoil protons at scattering angles close to 90 ffi . Forward scattering parameters oe T , b, and ae have been determined. For the ae-parameter, up to an order of magnitude higher level of precision has been achieved compared to that in earlier experiments. It is found that existing dispersion theory predictions are in disagreement with our results for the ae-parameter. There is no generally applicable theory which describes elastic scattering of hadrons. Phenomenological models, proposed to explain specific observations in selected regions of incident momenta (p lab ) and momentum transfer ( q jtj) have met with only limited success. In the low energy region (p lab ! 50 GeV/c) dispersion theory calculations hold the best promise. These are based on the principles of unitarity,... | |||||||||||||
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