Three gluon jets as a test of QCD

As a test of quantum chromodynamics (QCD), we suggest looking for gluon jets in the decay of a heavy quark-antiquark bound state produced in e⁺e^- annihilation, QQ → 3 gluons → 3 gluon jets. In particular, we point out that these events form a jet Dalitz plot, and we calculate the gluon or jet distributions (including the effect of polarized e⁺e^- beams). This process affords a test of the gluon spin. It is the analogue of two-jet angular distributions in e⁺e^-→ qq → 2 quark jets. We also estimate multiplicities and momentum distributions of hadrons in QQ → 3 gluons → hadrons, using the recently discovered Υ{hooked}(9.4) as an example.