The elektron has two bigger brothers, the muon and the tau particle. They are considerably heavier and if we interpret it as a particle system, the muon and tau are an elektron with considerably more energy put into that system.
So if it's a matter of energy, we could add more, presumably, and get even heavier particles. But this doesn't seem possible.
Apparently, from the speed of collapse from boson particles people have inferred that three is the maximum.
Why three? Why not four or six?
Why do we have these particles in the first place? What is there function? They quickly collapse in their lightest versions, which seems to make up the world as we see it around us. So without taus and muons the world would still look like we see it today.
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