| Theta meson | |
| Statistics: | bosonic |
| Interaction: | strong, weak, gravitational, electromagnetic |
| Antiparticle: | self |
| Status: | hypothetical |
| Electric Charge: | 0 e |
| Isospin: | 0 |
| Hypercharge: | 0 |
| Parity: | −1 |
| C Parity: | −1 |
The theta meson [1] is a hypothetical form of quarkonium (i.e. a flavourless meson) formed by a top quark and top antiquark . As a P-odd and C-odd state, it is analogous to the , and mesons. Due to the top quark's short lifetime, the theta meson is expected to not be observed in nature.[2]