Effective Field Theory with Two Higgs Doublets

Understand

In this article we extend the effective field theory framework describing new physics effects to the case where the underlying low-energy theory is a Two-Higgs-Doublet model.

• We derive a complete set of independent operators up to dimension six assuming a $Z_2$-invariant CP-conserving Higgs potential.
• The effects on Higgs and gauge boson masses, mixing angles in the Higgs sector as well as couplings to fermions and gauge bosons are computed.
• At variance with the case of a single Higgs doublet, we find that pair production of SM-like Higgses, arising through dimension-six operators, is not fixed by fermion-fermion-Higgs couplings and can therefore be sizable.