• Corpus ID: 18462317

Pion-pion scattering near threshold in the Resonance-Spectrum Expansion

  title={Pion-pion scattering near threshold in the Resonance-Spectrum Expansion},
  author={Eef van Beveren and George Erik Rupp},
  journal={arXiv: High Energy Physics - Phenomenology},
  • E. Beveren, G. Rupp
  • Published 12 February 2007
  • Physics
  • arXiv: High Energy Physics - Phenomenology
We study the properties of the Resonance-Spectrum Expansion near threshold in I=0 S-wave pion-pion scattering. The real part of the amplitude, when extrapolated from above threshold to below threshold, is found to vanish at a positive non-zero value of the total invariant mass of the system, in agreement with predictions from perturbative chiral models. In our exact analytic expression, the total amplitude vanishes identically at zero invariant mass. 
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