Geodesic
The $\rm O^-$ nonet and~solution of the~$U(1)$ problem in~a~nonperturbative approximation of~quantum chromodynamics
Teoretičeskaâ i matematičeskaâ fizika, Tome 74 (1988) no. 2, pp. 171-179

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In the model of dynamical breaking of chiral symmetry by the infrared singularities of QCD [1], the nonet of pseudoscalar mesons $(\pi, K, \eta, \eta')$ is described in terms of quasi–Goldstone bosons. The decay constant of the nonet is calculated in the chiral limit. The $U(1)$ problem is solved; the mass of the $\eta'$ meson in the chiral limit and the topological susceptibility are calculated, and the physical masses of the $\eta$ and $\eta'$ mesons are determined together with the pseudoscalar mixing angle by means of chiral perturbation theory. 
@article{TMF_1988_74_2_a1,
     author = {M. L. Nekrasov and V. E. Rochev},
     title = {The $\rm O^-$ nonet and~solution of the~$U(1)$ problem in~a~nonperturbative approximation of~quantum chromodynamics},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {171--179},
     publisher = {mathdoc},
     volume = {74},
     number = {2},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1988_74_2_a1/}
}
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M. L. Nekrasov; V. E. Rochev. The $\rm O^-$ nonet and~solution of the~$U(1)$ problem in~a~nonperturbative approximation of~quantum chromodynamics. Teoretičeskaâ i matematičeskaâ fizika, Tome 74 (1988) no. 2, pp. 171-179. http://geodesic.mathdoc.fr/item/TMF_1988_74_2_a1/