Abstract

We have measured small angle elastic pion-proton scattering in 40 and 50 GeV c π − beams at Serpukhov. Analysis of the data in the Coulomb interference region yields a value for the ratio of the real to the imaginary part of the strong amplitude, ϱ(0)=−0.074 ± 0.033 at 40 GeV/ c and ϱ(0)=−0.006 ±0.026 at 50 GeV/ c

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