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Positivity Constraints on Chiral Perturbation Theory Pion-Pion Scattering Amplitudes
We test the positivity property of the chiral perturbation theory (ChPT) pion-pion scattering amplitudes within the Mandelstam triangle. In the one-loop approximation, ${\cal O}(p^4)$, the positivity constrains only the coefficients $b_3$ and $b_4$, namely one obtains that $b_4$ and the linear combi...
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| Lenguaje: | eng |
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1999
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| Acceso en línea: | https://dx.doi.org/10.1103/PhysRevD.59.094007 http://cds.cern.ch/record/366582 |