The role of CP violating scatterings in baryogenesis - case study of the neutron portal

TL;DR

This paper investigates how CP violating scatterings influence baryogenesis in neutron portal models, demonstrating their significant impact on the resulting baryon asymmetry through numerical solutions of Boltzmann equations.

Contribution

It provides a detailed numerical analysis showing the dominant role of CP violating scatterings in baryogenesis within neutron portal scenarios, an aspect often overlooked.

Findings

CP violating scatterings significantly affect baryon asymmetry

Numerical solutions highlight parameter space regions where scatterings dominate

The study emphasizes the importance of including scatterings in baryogenesis models

Abstract

Many baryogenesis scenarios invoke the charge parity (CP) violating out-of-equilibrium decay of a heavy particle in order to explain the baryon asymmetry. Such scenarios will in general also allow CP violating scatterings. We study the effect of these CP violating scatterings on the final asymmetry in a neutron portal scenario. We solve the Boltzmann equations governing the evolution of the baryon number numerically and show that the CP violating scatterings play a dominant role in a significant portion of the parameter space.