Radiative Decays, Nonet Symmetry and SU(3) Breaking
Abstract
We re-examine the problem of simultaneously describing in a consistent way all radiative and leptonic decays of light mesons (V -> P gamma, P -> V gamma, P -> gamma gamma, 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 theta_P ~ -11^o and a value for theta_V which is ~ 3^o 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 eta', using only light meson decays.
Keywords
Cite
@article{arxiv.hep-ph/9902326,
title = {Radiative Decays, Nonet Symmetry and SU(3) Breaking},
author = {M. Benayoun and L. DelBuono and S. Eidelman and V. N. Ivanchenko and H. B. O'Connell},
journal= {arXiv preprint arXiv:hep-ph/9902326},
year = {2008}
}
Comments
36 pages. Published version