Why has there never been measured a free quark or gluon, but only objects that are built out of them, such as mesons and baryons?
5535
About free quarks and confinement
27098
Tachyons and Photons
89724
Where does mass come from in pair production?
35409
Massless charged particles
124763
Distinguishing identical particles
12433
How do $\pi^0$ particles exist?
74211
Protons and Neutrons Overshoot Actual Mass?
57097
Massless particle in FRW metric
82894
Why cannot fermions have non-zero vacuum expectation value?
74367
Newtonian mechanics: massless particles
15029
How do we know that the nucleus isn't a quark-gluon plasma?
31390
What prevents photons from getting mass from higher order Feynman diagrams
110266
Quarks in a hadron: where does the mass come from?
90917
Why do we have an elementary charge but no elementary mass?
61603
Why is the Yang–Mills existence and mass gap problem so fundamental?
132454
Has a free neutron ever been shown to absorb/emit/interact with a photon?
76255
Does a gluon have mass or not?