Theta meson

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.

The theta meson (θ) 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.

See also

References


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