Flavoursymmetry breaking of the quark condensate and chiral corrections to the GellMannOakesRenner relation
Abstract
The relation between the chiral quark condensate in QCD sum rules and chiral perturbation theory is clarified with the help of a lowenergy theorem for the scalar and pseudoscalar correlation functions. It is found that the quark condensate should be identified with the nonnormalordered vacuum expectation value of quarkantiquark fields. Utilising results on flavour SU(3) breaking of the quark condensate from QCD sum rules, the lowenergy constant H _{2} ^{r} in the chiral Lagrangian, as well as nexttoleading order corrections to the GellMannOakesRenner relation are estimated.
 Publication:

Physics Letters B
 Pub Date:
 June 2002
 DOI:
 10.1016/S03702693(02)019512
 arXiv:
 arXiv:hepph/0201174
 Bibcode:
 2002PhLB..538...71J
 Keywords:

 12.38.Aw;
 11.55.Hx;
 12.39.Fe;
 11.30.Hv;
 High Energy Physics  Phenomenology;
 High Energy Physics  Lattice;
 Nuclear Theory
 EPrint:
 12 pages, discussion of Psi(0) determinations corrected, refs. added