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A hypothetical meson consisting of a bundle of gluons and containing no valence quarks.

[glue (because gluons mediate the strong interaction that binds quarks together) + ball.]


a hypothetical composite subatomic particle
References in periodicals archive ?
A calculation that took 2 years on a powerful special-purpose computer has provided evidence that a hypothesized subnuclear particle called a glueball actually exists.
QCD experts have predicted the existence of glueballs [22].
Topics of the two summary talks include heavy quark hadrons and theory, and glueballs, hybrids, baryons and pentaquarks.
The second set contains the search for a monopole by means of its direct interaction with charge, glueballs, pentaquarks, nuggets of Strange Quark Matter (SQM) and the Higgs boson.
One way of creating this r potential was found by making a new force nature that requires the QCD "equivalent of the photon", the gluon, to not only mediate the force as does the photon, but also participates in it (requires glueballs to exist).