Flavor invariant and CPV

Flavor invariant and CPV

Typically flavor is not invariant under symmetry. But if we want to construct the flavor invariant operators order by order, how should we do?

This is a quite different logic than constructing the effective operators. Flavor invariant using spurion fields.

  • Hilbert Series for Leptonic Flavor Invariants in the Minimal Seesaw Model, arxiv

  • Systematic construction of basis invariants in the 2HDM, arxiv

  • Flavor Invariants and Renormalization-group Equations in the Leptonic Sector with Massive Majorana Neutrinos, arxiv

EFT operator and flavor symmetry

One can impose the flavor symmetry, such as MFV for quark fields. In this case, Lagrangian has flavor symmetry.