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most citedMass and width of the lowest resonance in QCD

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hep-ph2001★ 131 cited

The quark condensate from K_{e_4} decays

G. Colangelo, J. Gasser, H. Leutwyler

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…