Phys. Rev. Lett. 86, 5008 - 5010 (2001)The Quark Condensate from Ke4 Decays |
PRL Celebrates 50 Years
This Week's Milestone Letters are from 1984: |
G. Colangelo
Institute for Theoretical Physics, University of Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
J. Gasser and H. Leutwyler
Institute for Theoretical Physics, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland
Received 12 March 2001
We show that, independently of the size of the quark condensate, chiral symmetry correlates the two S-wave ππ scattering lengths. In view of this constraint, the new precision data on Ke4 decay allow a remarkably accurate determination of these quantities. The result confirms the hypothesis that the quark condensate is the leading order parameter.
©2001 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v86/p5008
DOI: 10.1103/PhysRevLett.86.5008
PACS: 12.38.Aw, 11.30.Rd, 11.55.Fv, 12.39.Fe
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