Dynamics behind the quark mass hierarchy

Understand

We introduce a new class of models describing the quark mass hierarchy.

• In this class, the dynamics primarily responsible for electroweak symmetry breaking (EWSB) leads to the mass spectrum of quarks with no (or weak) isospin violation.
• Moreover, the values of these masses are of the order of the observed masses of the down-type quarks.
• Then, strong (although subcritical) horizontal diagonal interactions for the $t$ quark plus horizontal flavor-changing neutral interactions between different families lead (with no fine tuning) to a realistic quark mass spectrum.