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  • Access by Xinjiang University

Energy Dependence of the Phase Shifts in Pion-Proton Scattering

Jay Orear

  • Columbia University, New York, New York

Phys. Rev. 100, 288 – Published 1 October, 1955

DOI: https://doi.org/10.1103/PhysRev.100.288

Abstract

It is shown that all pion-proton scattering data up to 300 Mev can be fit within limits of experimental error by using the s-waves linearly extrapolated from the low-energy slopes of α1=0.16η and α3=0.11η. All other phase shifts are assumed zero except α33 which is given the energy dependence proposed by Chew and Low, (η3ω*)cotα33=8.053.8ω*. The two constants in the α33 energy dependence fit the initial slope of α33=0.235η3 as determined from low-energy experiments and make α33 go through 90° at 192 Mev. According to the cutoff theory this determines a kmax6μc, corresponding to a pion-nucleon interaction of much shorter range than μc. A theoretical implication of the fit proposed here is that also the s-wave interaction range is less than μc

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