Theta meson
The theta meson (θ)[1] is a hypothetical form of quarkonium (i.e. a flavourless meson) formed by a top quark (t) and top antiquark (t). As a P-odd and C-odd tt state, it is analogous to the ϕ (ss), J/ψ (cc) and ϒ (bb) mesons. Due to the top quark's short lifetime, the theta meson is expected to not be observed in nature.[2] In 2025, new research from the CMS[3] and ATLAS[4] collaborations demonstrated the existence of theta mesons at greater than 5-sigma significance.[5][6] See alsoReferences
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