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On the Determination of πN Phase Shifts from Isospin Constraints and Fixed t Analyticity

  • I. S. Stefanescu
Conference paper
Part of the Acta Physica Austriaca book series (FEWBODY, volume 23/1981)

Abstract

This seminar deals with the problem of the determination of the phase of the πN scattering amplitudes from observable quantities (differential cross-sections and polarizations). Its aim is to present, following Ref.[1], conditions on the amplitudes under which a unique construction of the phase can be achieved in some neighbourhood of the forward direction, using constraints coming from analyticity at fixed momentum transfer (t), isospin invariance and unitarity.

Keywords

Analytic Continuation Meromorphic Function Positivity Property Physical Region Observable Quantity 
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Copyright information

© Springer-Verlag 1981

Authors and Affiliations

  • I. S. Stefanescu
    • 1
  1. 1.Institut für Theoretische KernphysikUniversität KarlsruheGermany

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