Abstract
The πN amplitudes are estimated from data in the region 0.8 ⩽ | t| ⩽ 1.4 (GeV/ c) 2 for incident momentum between 3.7 and 14 GeV/ c, under the assumption of ϱ-Regge-pole phase for the I t = 1 s-channel helicity flip amplitude. The main conclusions are: (i) the real part of the I t = 0 non-flip amplitude is substantial and its non-asymptotic variation with energy has not died out, (ii) the I t = 1 non-flip amplitude shows a large degree of shrinkage as energy increases out to t = −1.4 (GeV/ c) 2, (iii) the I t = 1 non-flip amplitude has a second cross-over zero at t ≊ −1.2 ( GeV/c) 2 in its imaginary part.
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