# Is it possible that there are more than 6 quark flavors/more than 3 generations? [duplicate]

I thought that things like the top quark don't exist in nature because they're super unstable and we can only observe them after high-energy collisions (e.g. LHC)

Is it possible to make even more massive quarks?

Or is there a reason the limit is six?

That there are no more than three generations was predicted in this experiment in connection with the decay of the $Z$-particle (one of the three massive particles that convey the weak force). In the model I referred to also these particles are composite though, so I think it's still an open question. Or maybe it really shows there are (in the light of this model) no more than three generations, and an eventual fourth one can't be excited at very high energies.