Classification of effective operators for interactions between the Standard Model and dark matter

Abstract

Abstract: We construct a basis for effective operators responsible for interactions between the Standard Model and a dark sector composed of particles with spin ≤ 1. Redundant operators are eliminated using dim-4 equations of motion. We consider simple scenarios where the dark matter components are stabilized against decay by ℤ 2 symmetries. We determine operators which are loop-generated within an underlying theory and those that are potentially tree-level generated.