Abstract
The elastic scattering of 3.6 GeV/ c π + mesons by protons has been studied in a hydrogen bubble chamber experiment. The elastic cross section has a measured value of 7.07 ± 0.20 mb. The forward diffraction peak has been fitted in the region 0.05 ≦ − t ≦ 0.6 (GeV/ c) 2 by a form (d σ/d t) = Ae Bt , where A = 46.5 ± 1.8 mb/(GeV/ c) 2 and B = 6.85 ± 0.20 (GeV/ c) −2. From this fit and the optical theorem, the magnitude of the ratio of real to imaginary forward amplitude is 0.39 ± 0.06, in reasonable agreement with dispersion relation calculations and simple Regge model predictions.
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