Zeitschrift für Physik

, Volume 242, Issue 2, pp 157–166 | Cite as

Unitarity and crossing symmetry in low-energy π-π scattering

  • R. Baier
  • H. Kühnelt
  • F. Widder


A method of unitarizing the Veneziano model for ππ scattering, employing exact conditions on partial wave amplitudes which allow a minimization of the violation of crossing symmetry is discussed. The structure of the left hand cut (0≧s≧ − 32m π 2 ) is obtained via crossing symmetry, whereas the far left hand cut is parametrized in terms of several poles, the residues of which serve as free parameters in this model. The existence of unitary and almost crossing symmetric solutions with a resonantI=0S-wave is demonstrated. The restrictions on these solutions are, however, not sufficient to single out a unique set.


Elementary Particle Free Parameter Wave Amplitude Partial Wave Symmetric Solution 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag 1971

Authors and Affiliations

  • R. Baier
    • 1
  • H. Kühnelt
    • 2
  • F. Widder
    • 3
  1. 1.Institut für Theoretische PhysikUniversität GrazÖsterreich
  2. 2.Institut für Theoretische PhysikUniversität WienÖsterreich
  3. 3.Institut für Theoretische PhysikUniversität TübingenGermany

Personalised recommendations