Lattice Predictions
Lattice QCD predictions for glueballs are now fairly stable, at least when virtual quarks are neglected. The two lowest states are
-
- 0++ with mass of 1,611±163 MeV/c2 and
- 2++ with mass of 2,232±310 MeV/c2
The 0−+ and exotic glueballs such as 0−− are all expected to lie above 2 GeV/c2. Glueballs are necessarily isoscalar, with isospin I = 0.
The ground state hybrid mesons 0−+, 1−+, 1−−, and 2−+ all lie a little below 2 GeV/c2. The hybrid with exotic quantum numbers 1−+ is at 1.9±0.2 GeV/c2. The best lattice computations to date are made in the quenched approximation, which neglects virtual quarks loops. As a result, these computations miss mixing with meson states.
Read more about this topic: Exotic Meson
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