In Wikipedia,
"In particle physics, a glueball (also gluonium, gluon-ball) is a hypothetical composite particle.[1] It consists solely of gluon particles, without valence quarks. Such a state is possible because gluons carry color charge and experience the strong interaction between themselves. Glueballs are extremely difficult to identify in particle accelerators, because they mix with ordinary meson states.[2]"
If Glueball exists, what happens as an effect?
If Glueball exists, what happens as an effect?
Glue balls should exist as lattice QCD, which is a succesful tool for calculating strong interactions, (as for example it almost fits the masses of the resonances, (page 2) ) predicts and gives ranges for finding them.
A glueball candidate should appear as a resonance in the invariant masses of particles to which it will decay, which are the same particles to which the usual resonances decay, so it is hard to think of a way to separate the glue balls from normal resonances. This article has a review of possibilities.
There have been considerable efforts to identify glueballs experimentally. The aim is at first to establish the lightest qq_bar nonets in the spectrum; then, the appearance of extra states could hint towards a glueball. More directly, one looks for an enhanced production of a glueball candidate in "gluon rich" processes but a suppression in γγ reactions.
It goes on with examples.
