- #1
michael879
- 698
- 7
I was taking a look at the SM particle table and I noticed that the up/down quarks seem to be "reversed" from the usual structure. Neglecting those two quarks, the "up" family is the most massive, then the "down" family, then the "electron" family, then the "neutrino" family. However for some reason the down quark is more massive than the up quark, breaking this pattern.
So I was wondering if there are any theories that attempt to explain this mass structure of the fermions (or coupling constants if the Higgs generates their mass)?
So I was wondering if there are any theories that attempt to explain this mass structure of the fermions (or coupling constants if the Higgs generates their mass)?