The most recent total-cross-section data are used to calculate real parts of the forward elastic π^±p scattering amplitudes from threshold to 240 GeV/c. Using statistical and systematic uncertainties of the total cross sections and their momenta, along with uncertainties of the subtraction and coupling constants, unphysical cuts, and cross-section extrapolations, we calculate the uncertainties of the real amplitudes. Our results are compared to experimental and other theoretical determinations of the π^±p forward real amplitudes.
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Engelmann et al. (1977) studied this question.
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