The slope $b(s)$ of the forward diffraction peak of p-p elastic scattering has been measured in the momentum-transfer-squared range 0.005|t|0.09 (GeV/c)² and at incident proton energies from 8 to 400 GeV. We find that $b(s)$ increases with s, and in the interval 100s750 (GeV)² it can be fitted by the form b(s)=b₀+2α^'lns with b₀=8.23±0.27, α^'=0.278±0.024 (GeV/c)^-2.
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Bartenev et al. (1973) studied this question.