@article{oai:ir.soken.ac.jp:00003278,
 author = {平田, 光司 and HIRATA, Koji and HIRATA, Kohji and KOBAYASHI, Tsunehiro and TAKAIWA, Yoshinobu},
 issue = {1},
 journal = {Physical Review D, Physical Review D},
 month = {},
 note = {The compositeness of mesons is taken into account in the evaluation of decays and mixing of η, η′, and ηc with an idea abstracted from quantum chromodynamics. Effective couplings of a pseudoscalar meson and two gluons are calculated in a simple model, where the Bethe-Salpeter amplitude is approximated in terms of harmonic-oscillator wave functions. The model is constructed so as to reproduce S-wave meson masses and the values of wave functions at the origin in the sense of the nonrelativistic quark model. In this model Γ(π0→2γ) is reproduced satisfactorily. We obtain an s-dependent mixing angle, which is estimated to be -42.3° and -40.0° for s=Mη2 and s=Mη′2, respectively. Criticism of various estimations of the angle is presented. All the results are shown to be consistent with experiments. The importance of the compositeness of mesons is stressed.},
 pages = {236--241},
 title = {Mixing and decays of pseudoscalar mesons in a nonrelativistic quark model with an idea abstracted from quantum chromodynamics},
 volume = {18},
 year = {1978},
 yomi = {ヒラタ, コウジ}
}