title: 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 pipi 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.
authors.affiliation: Institute for Theoretical Physics, University of Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.
authors.forename: G
authors.initials: G
authors.lastname: Colangelo
authors.forename: J
authors.initials: J
authors.lastname: Gasser
authors.forename: H
authors.initials: H
authors.lastname: Leutwyler