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
Statisticsbosonic
Interactionsstrong, weak, gravitational, electromagnetic
Statushypothetical
Antiparticleself
Electric charge0 e
Isospin0
Hypercharge0
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]

See also

References

  1. ^ Roos, M.; Wohl, C.G. "Naming Scheme for Hadrons" (PDF). lbl.gov. Retrieved 23 March 2022.
  2. ^ 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.


source: http://en.wikipedia.org/wiki/Theta_meson