We review the current status of rho-omega mixing and discuss its implication
for our understanding of charge-symmetry breaking. In order to place this work
in context we also review the photon-hadron coupling within the framework of
vector meson dominance. This leads naturally to a discussion of the
electromagnetic form-factor of the pion and of nuclear shadowing.Comment: 52 pages with 14 figures. This published version includes updated
references and minor changes to tex
We reexamine the problem of simultaneously describing in a consistent way all radiative and leptonic decays of light mesons (V→ P␥, P→V␥, P→␥␥, V→e ϩ e Ϫ ). For this purpose, we rely on the hidden local symmetry model in both its anomalous and non-anomalous sectors. We show that the SU͑3͒ 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* Ϯ 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 P ӍϪ11°and a value for V which is Ӎ3°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 Ј, using only light meson decays.
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