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### Experimental evidence for 3 generations of quark?

I know that looking at the invisible decay width of the $Z$-boson at the LEP collider at CERN leads to the evidence of the existence of three (light) lepton generations but I can't find any ...
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### Is quark electric charge also confined?

Since we will (maybe) never observe free quarks which has fraction charge, is it logically correct to say that the fraction (1/2,2/3 etc) electric charge is also confined. I.e. the charges that we do ...
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### A few questions on quarks, gluons and the strong force

I wanted to answer for myself some pretty fundamental questions pertaining to the strong interaction, color charge and quarks, but I'm sort of stumbling on a few. So I wanted to find the reason/...