QCD string and chiral symmetry

A. A. Andrianov, D. Espriu

Research outputpeer-review

1 Citation (Scopus)


We assume that QCD can be described in a certain kinematical regime by an effective string theory. This hadronic string must couple to background chiral fields in a chirally invariant manner, taking into account the true chirally non-invariant QCD vacuum. By requiring conformal symmetry of the string and the unitarity constraint on chiral fields we reconstruct the equations of motion for the latter ones. These provide a consistent background for the propagation of the string. By further requiring locality of the effective action we recover the Lagrangian of non-linear sigma model of pion interactions. The prediction is totally unambiguous and parameter-free. The estimated chiral structural constants of Gasser and Leutwyler fit very well the phenomenological values.

Original languageEnglish
Title of host publicationHadron Physics
Subtitle of host publicationEffective Theories of Low Energy QCD - 2nd International Workshop on Hadron Physics
EditorsM. C. Ruivo, A. H. Blin, B. Hiller, E. van Beveren, A. A. Osipov
PublisherAmerican Institute of Physics
Number of pages8
ISBN (Electronic)0735401209
Publication statusPublished - 1 Apr 2003
Event2nd International Workshop on Hadron Physics: Effective Theories of Low Energy QCD - Coimbra
Duration: 25 Sep 200229 Sep 2002

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Conference2nd International Workshop on Hadron Physics: Effective Theories of Low Energy QCD

Scopus subject areas

  • Physics and Astronomy(all)

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