The Effective Lagrangian for QCD

We propose a method to derive the low-energy efective action of QCD assuming that the long-distance properties of strong interactions can be described by a string theory.We bypass the usual problems related to the existence of the tachyon and absence of the adequate Adler zero by using a sigma model approach where excitations above the correct (chirally non-invariant) QCD vacuum are included. Two-dimensional conformal invariance then implies the vanishing of the O(p 4 ) effective lagrangian coefficients. We interpret this result and discuss ways to go beyond this limit.

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Chiral Lagrangians and the QCD string

Alfaro

Dobado

Espriu

1999

Physics Letters B

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The Effective Lagrangian for QCD

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Chiral Lagrangians and the QCD string

Chiral Lagrangians and the QCD string

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