Light bound states of heavy fermions

Understand

In the Standard Model, a group of heavy fermions, e.g.

• top quarks, can collectively strongly affect the Higgs field and create relatively long-lived bound states.
• If there exist new generations of fermions with masses beyond 1 TeV, strong binding of several of them can make them lighter than even a single heavy fermion.
• Using the mean field approximation we find multi-fermion states with masses M ~ 5 v N^{1/2} ~ 1.2 N^{1/2} TeV, with N=2,3...