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Concept
Omega meson
Summary
The omega meson (_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.
The most common decay mode for the ω meson is _Pion+_Pion0_Pion- at 89.2±0.7%, followed by _Pion0_Gamma at 8.34±0.26%.
The quark composition of the _Omega meson meson can be thought of as a mix between _up quark_up antiquark, _down quark_down antiquark and _strange quark_strange antiquark states, but it is very nearly a pure symmetric _up quark_up antiquark-_down quark_down antiquark state. This can be shown by deconstructing the wave function of the _Omega meson into its component parts. We see that the _Omega meson and _Phi meson mesons are mixtures of the SU(3) wave functions as follows.
where
is the nonet mixing angle,
and
The mixing angle at which the components decouple completely can be calculated to be , which almost corresponds to the actual value calculated from the masses of 35°. Therefore, the _Omega meson meson is nearly a pure symmetric _up quark_up antiquark-_down quark_down antiquark state.
Official source
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