For 10 points, name these particles that "bind" quarks.
The detection of "balls" made of only these particles will be the focus of the PANDA experiment. A three-jet event at PETRA was the first experimental evidence of these particles. Shortly after the Big Bang, the universe was filled with a "plasma" consisting of quarks and them. Along with photons, these particles have zero mass. There are eight different types of these gauge bosons, which mediate the strong force. For 10 points, name these particles that "bind" quarks.
The detection of "balls" made of only these particles will be the focus of the PANDA experiment.
gluons