The detection of these non-hybrid particles is one of the main goals of the proposed PANDA experiment in Darmstadt.
Morningstar and Peardon investigated the mass spectrum of these particles using lattice methods. Modeling these particles as closed, knotted flux tubes accounts for their degeneracy. These are the only particles predicted by the Standard Model to possess a total angular momentum of either 2 or 3 in their ground state. In late 2015, research conducted by Rebhan and Brunner at TU Vienna demonstrated that a resonance known as "f0-(1710)" ["f-sub-zero seventeen-ten"] may be the (*) first confirmed example of one of these particles. The detection of these non-hybrid particles is one of the main goals of the proposed PANDA experiment in Darmstadt. The existence of these particles is possible because their constituent particles carry their own interaction force. For 10 points, name this hypothetical composite particle predicted by QCD that consists solely of the carriers of the strong force, without any valence quarks.
Morningstar and Peardon investigated the mass spectrum of these particles using lattice methods.
glueballs [or gluonium; or gluon-ball; do NOT accept or prompt on "gluon(s)"]