The quark condensate from K_{e_4} decays

Abstract

We show that, independently of the size of the quark condensate, chiral symmetry correlates the two S-wave ππscattering 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.

4 pages (LaTex), 3 figures

References in corpus (1)

• Zweig rule violation in the scalar sector and values of low-energy constants

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