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

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.

24 pages, 10 figures. V2: typos corrected. V3: small changes in text and title

References in corpus (9)

• Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
• Leptogenesis
• Big Bang Nucleosynthesis Constraints on Hadronically and Electromagnetically Decaying Relic Neutral Particles
• Full Boltzmann equations for leptogenesis including scattering
• CP violation in scatterings, three body processes and the Boltzmann equations for leptogenesis
• Particle-antiparticle asymmetries from annihilations
• CP Violation from Scatterings with Gauge Bosons in Leptogenesis
• On the full Boltzmann equations for Leptogenesis
• Towards Cogenesis via Asymmetric Freeze-in: The $\chi$ Who Came-in from the Cold

Cited by in corpus (10)

• Limiting Lorentz Violation from Neutron--Antineutron Oscillation
• Leptogenesis, Dark Matter and Gravitational Waves from Discrete Symmetry Breaking
• Ultraviolet freeze-in baryogenesis
• Mass-derivative relations and unitarity constraints for $CP$ asymmetries at finite temperature
• Mini-review on baryogenesis at the TeV scale and possible connections with dark matter
• Minimal effective theory for leptogenesis, dark matter, and neutrino masses
• Effective Theory for Baryogenesis with a Majorana Fermion Pair Coupled to Quarks
• Genesis of baryon and dark matter asymmetries through ultraviolet scattering freeze-in
• Baryon Asymmetry from the Decay and Scattering of a Majorana Fermion Pair Coupled to Quarks
• Baryogenesis via relativistic bubble expansion