Premise: In 1965, Moo-Young Han with Yoichiro Nambu and Oscar W. Greenberg independently resolved the problem by proposing that quarks possess an additional SU(3) gauge degree of freedom, later called color charge. Han and Nambu noted that quarks would interact via an octet of vector gauge bosons: the gluons.
Hypothesis: Proof of Top Quarks was found.
Label: neutral