Charm Quark
1 × 10-19 m
The charm quark and the strange quark are the second generation of matter. They will quickly decay into up and down quarks, which are the first generation of matter. The charm quark is charming.

1 × 10-19 m
The charm quark and the strange quark are the second generation of matter. They will quickly decay into up and down quarks, which are the first generation of matter. The charm quark is charming.
