The other flavours of quark are basically higher energy versions of the Up and Down quarks that atomic nuclei are made from. In our universe, systems, including particles, tend toward the lowest available energy state. So, if a high-energy quark forms, it will eventually decay into a lower-energy version. That’s why we don’t usually see particles made from these other flavours of quark. Even when they do form, through some high-energy event or whatnot, they’ll eventually transform into protons or neutrons.
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