The Quark condensate from K(e4) decays

We show that, independently of the size of the quark condensate, chiral symmetry correlates the two S-wave \pi\pi scattering lengths. In view of this constraint, the new precision data on K_{e_4} decay allow a remarkably accurate determination of these quantities. The result confirms the hypothesis that the quark condensate is the leading order parameter.

quark: condensation
symmetry: chiral
pi pi: scattering amplitude
partial wave: scattering length
correlation: scattering length
K: semileptonic decay
numerical calculations: interpretation of experiments
K --> 2pi electron neutrino

References(22)

Figures(0)

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