Pion Physics at Low Energy and High Accuracy

Details Pion Physics at Low Energy and High Accuracy Pion Physics at Low Energy and High Accuracy

2001-07-31

arxiv.org/abs/hep-ph/0107332v1

AIP Conf.Proc. 602 (2001) 3-13

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk given at the Workshop QCD@Work, Martina Franca, June 2001

Scientific paper

10.1063/1.1435906

The role of the quark condensate for the low energy structure of QCD is discussed in some detail. In particular, the dependence of M_pi on m_u and m_d and the low energy theorems for the pi-pi scattering amplitude are reviewed. The new data on Ke4 decay beautifully confirm the standard picture, according to which the quark condensate is the leading order parameter of the spontaneously broken chiral symmetry.

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