The omega meson (ω) 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[4][5] and mediates the nuclear force along with pions and rho mesons.
The most common decay mode for the ω meson is π+π0π− at 89.2±0.7%, followed by π0γ at 8.34±0.26%.[6]
(>5% of decays)
The quark composition of the ω meson can be thought of as a mix between uu, dd and ss states, but it is very nearly a pure symmetric uu-dd state. This can be shown by deconstructing the wave function of the ω into its component parts. We see that the ω and ϕ mesons are mixtures of the SU(3) wave functions as follows.[7]
where
The mixing angle at which the components decouple completely can be calculated to be arctan --> 1 2 ≈ ≈ --> 35.3 ∘ ∘ --> {\textstyle \arctan {\frac {1}{\sqrt {2}}}\approx 35.3^{\circ }} , which almost corresponds to the actual value calculated from the masses of 35°. Therefore, the ω meson is nearly a pure symmetric uu-dd state.
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