For 10 points, name these subatomic particles, believed to be fundamental constituents of matter.
In March 2009, the D0 group announced the discovery of the production of a single one of one of these objects through the weak force. That one has a mass comparable to a gold atom nucleus, and was the sixth and last to be discovered. In addition to the "top" one, the "up" and "down" ones make up protons and neutrons. Their name was coined by Murray Gell-Mann after a passage from Finnegan's Wake. For 10 points, name these subatomic particles, believed to be fundamental constituents of matter.
In March 2009, the D0 group announced the discovery of the production of a single one of one of these objects through the weak force.
{quarks} [accept early {top quark}]