Why is it interesting?

Layman

Student

• The Fermion Mass Problem by K.S. Babu
• A Model-Building Approach to the Origin of Flavor by E. Schuhmacher

Researcher

The Yukawa couplings express the flavour problem, i.e. our inability to compute quark and lepton masses and mixing angles. […]

no significant progress has ever been made in computing quark and lepton masses and mixing angles or understanding the dynamical origin of their pattern. […] Given our failure in cracking the flavour problem, it is unlikely that its solution is simple and that it manifests itself in simple ways. Only crazy results in flavour physics have a chance to be true.

https://arxiv.org/pdf/1710.07663.pdf#page23

Proposed Solutions:

"all fermions are created equal"

See On the proposition that all fermions are created equal by Howard Georgi, Ann Nelson, Aneesh Manohar

Flavor Symmetries

For a great introduction, see this thesis.

Examples

Example1

Example2:

History