Master Formula Approach to Chiral Symmetry Breaking: Pi-Pi scattering
classification
✦ hep-ph
keywords
approachbreakingchiraldataformulamasterphasepi-pi
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The master formula approach to chiral symmetry breaking is used to analyze the phase shifts for $\pi\pi$ scattering in the elastic region. The results are in excellent agreement with the data for the phase shifts up to the K-K bar threshold. Our analysis shows that the pi-pi data near threshold in the scalar channel favors a large quark condensate in the vacuum, i.e. <q bar q> \sim -(240 MeV)^3.
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