 Quark structure of the theta meson | |
| Composition | tt |
|---|---|
| Statistics | bosonic |
| Interactions | strong,weak,gravitational,electromagnetic |
| Status | hypothetical |
| Antiparticle | self |
| Electric charge | 0e |
| Isospin | 0 |
| Hypercharge | 0 |
| Parity | −1 |
| C parity | −1 |
Thetheta meson (θ)[1] is a hypothetical form ofquarkonium (i.e. aflavourlessmeson) formed by atop quark (t) and top antiquark (t). As aP-odd andC-oddtt state, it is analogous to theϕ (ss),J/ψ (cc) andϒ (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 theCMS[3] andATLAS[4] collaborations demonstrated the existence of theta mesons at greater than 5-sigma significance.[5][6]
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