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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 1999, vol. 59, p. 1-19

Radiative decays, nonet symmetry, and SU(3) breaking

Benayoun M., DelBuono L., Eidelman S., Ivanchenko V. N., O'Connell H. B.

We reexamine the problem of simultaneously describing in a consistent way all radiative and leptonic decays of light mesons (V→Pγ, P→Vγ, P→γγ, V→e+e-). For this purpose, we rely on the hidden local symmetry model in both its anomalous and non-anomalous sectors. We show that the SU(3) symmetry breaking scheme proposed by Bando, Kugo and Yamawaki, supplemented with nonet symmetry breaking in the pseudoscalar sector, allows one to reach a nice agreement with all data, except for the K*± radiative decay. An extension of this breaking pattern allows one to account for this particular decay mode too. Considered together, the whole set of radiative decays provides a pseudoscalar mixing angle θP≃-11° and a value for θV which is ≃3° from that of ideal mixing. We also show that it is impossible, in a practical sense, to disentangle the effects of nonet symmetry breaking and those of glue inside the η′, using only light meson decays. ©1999 The American Physical Society.