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

TL;DR

This paper explores how effective field theory with dimension-6 operators can facilitate electroweak baryogenesis and phase transition, with testable predictions at colliders like the LHC and CEPC.

Contribution

It demonstrates that dimension-6 operators can enable strong first order phase transition and CP violation, linking collider phenomenology with baryogenesis mechanisms.

Findings

Dimension-6 operators can induce strong first order phase transition.

These operators provide sizable CP violation for baryogenesis.

Collider signatures can verify the effective theory predictions.

Abstract

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.