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Strong Interactions at Low Energy

The lectures review some of the basic concepts relevant for an understanding of the low energy properties of the strong interactions: chiral symmetry, spontaneous symmetry breakdown, Goldstone bosons, quark condensate. The effective field theory used to analyze the low energy structure is briefly sketched. As an illustration, I discuss the implications of the recent data on the decay $K\to ππeν$ for the magnitude of the quark condensate.

preprint2002arXivOpen access
H. Leutwyler
hep-ph
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H. Leutwyler

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