Ward Identities for the Standard Model Effective Field Theory

Understand

We derive Ward identities for the Standard Model Effective Field Theory using the background field method.

• The resulting symmetry constraints on the Standard Model Effective Field Theory are basis independent, and constrain the perturbative and power-counting expansions.
• A geometric description of the field connections, and real representations for the $\rm SU(2)_L \times U(1)_Y$ generators, underlies the derivation.