Not to be confused with the θ+ of the τ–θ puzzle, which is now identified as kaon, or with the Θ+ and Θ+ c, formerly thought to be pentaquarks.
Theta meson
Composition
t t
Statistics
bosonic
Interactions
strong, weak, gravitational, electromagnetic
Status
hypothetical
Antiparticle
self
Electric charge
0 e
Isospin
0
Hypercharge
0
Parity
−1
C parity
−1
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 t t state, it is analogous to the ϕ ( s s ), J/ψ ( c c ) and ϒ ( b b ) mesons. Due to the top quark's short lifetime, the theta meson is expected to not be observed in nature.[2]
^Roos, M.; Wohl, C.G. "Naming Scheme for Hadrons" (PDF). lbl.gov. Retrieved 23 March 2022.
^Fabiano, N. (1998). "Top mesons". European Physical Journal C. 2 (2): 345–350. arXiv:hep-ph/9704261. Bibcode:1998EPJC....2..345F. doi:10.1007/s100520050144. S2CID 17321939.
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