Testing the electroweak phase transition and electroweak baryogenesis at the LHC and a circular electron-positron collider

Understand

We study the collider phenomenology of the electroweak phase transition and electroweak baryogenesis in the framework of the effective field theory.

• Our study shows that the effective theory using the dimension-6 operators can enforce strong first order phase transition and provide sizable CP violation to realize a successful electroweak baryogenesis.
• Such dimension-6 operators can induce interesting Higgs phenomenology that can be verified at colliders such as the LHC and the planning CEPC.
• We then demonstrate that this effective theory can originate from vector-like quarks and the triplet Higgs.