Meson that is a superposition of an up quark–antiquark and a down quark–antiquark pair
The omega meson () is a flavourless meson formed from a superposition of an up quark–antiquark and a down quark–antiquark pair. It is part of the vector meson nonet and mediates the nuclear force along with pions and rho mesons.
Properties.
The most common decay mode for the ω meson is at 89.2±0.7%, followed by at 8.34±0.26%.
The quark composition of the meson can be thought of as a mix between , and states, but it is very nearly a pure symmetric - state. This can be shown by deconstructing the wave function of the into its component parts. We see that the and mesons are mixtures of the SU(3) wave functions as follows.
 formula_1,
 formula_2,
where
 formula_3 is the nonet mixing angle,
 formula_4 and
 formula_5.
The mixing angle at which the components decouple completely can be calculated to be formula_6, which almost corresponds to the actual value calculated from the masses of 35°. Therefore, the meson is nearly a pure symmetric - state.
References.
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