Prediction ofp-,d-, andf-Wave Pion-Nucleon Scattering

Pion-Nucleon Interactions

“…The choice of solution at 300 MeV does tend to be important (though probably not critical) as a starting point of higher-energy analyses. Dynamical pre dictions based on longer-range pion-nucleon forces (40,41) are in reasonable agreement with the values at ",300 MeV of Table I; detailed comments and comparisons on this and other points are given by Hull & Lin (39) . Apart from the P 33 phase shift, one of the most interesting features of the solution is that the pu phase shift is negative at low energies, but passes through zero near 170 MeV to become positive and rapidly increasing at the end of our energy range.…”

EmpiricalNDPotential and Castillejo-Dalitz-Dyson Poles in the Pion-NucleonP11State

“…and/or cr s for virtual yp scattering; and W 2 is related to the combination o^ + a s . 6 iM# 2 ) includes all the necessary factors of a, a-1, r(a), etc. In particular Pp(q 2 ) * 0 because of the mechanism which reinstates the Pomeranchukon contribution (see Ref.…”

π+−pScattering at 250 MeV: Experiment and Analysis

“…Consequently, the error matrices of the acceptable SPD and SPDF solutions are also given in Tables VII and VIII. The agreement with other experiments, notably with Foote and Rogers, is good. The evidence which led to the rejection of solution C (Fermi-II) is substantiated 12 which is based on dispersion relations for the partial-wave scattering amplitudes. Because of the method of their analysis, their predictions are valid only for V^ 1, but they improve with increasing L. The results of these…”