Electroweak baryogenesis in the framework of the effective field theory

TL;DR

This paper explores how extending the Standard Model with a light singlet scalar and a dimension-5 operator within an effective field theory framework can facilitate electroweak baryogenesis, producing observable phenomenology and satisfying experimental constraints.

Contribution

It introduces a novel EFT approach with a light scalar and higher-dimensional operator to achieve strong first order phase transition and CP violation for baryogenesis.

Findings

Achieves strong first order phase transition with new scalar

Provides sufficient CP violation for baryon asymmetry

Constrained by baryon-to-photon ratio, experiments, and LHC data

Abstract

We study the electroweak baryogenesis in the framework of the effective field theory. Our study shows that by introducing a light singlet scalar particle and a dimension-5 operator, it can provide the strong first order phase transition and the source of the CP-violation during the phase transition, and then produce abundant particle phenomenology at zero temperature. We also show the constraints on the new physics scale from the observed baryon-to-photon ratio, the low-energy experiments, and the LHC data.