On the CP asymmetries in Majorana neutrino decays

Abstract

We study the CP asymmetries in lepton number violating two body scattering processes and show explicitly how they vanish, in agreement with unitarity constraints. We relate these cross section asymmetries to the CP decay rate asymmetries of the intermediate massive neutrinos and show how the inclusion of the Universe expansion via Boltzmann equations is the key ingredient to allow the production of a non-vanishing asymmetry in spite of the unitarity constraint on the cross sections. We then show that the absorptive parts of both the one loop vertex and self energy corrections do contribute to the CP decay asymmetries.

References in corpus (7)

• CP violating decays in leptogenesis scenarios
• Baryogenesis from a Lepton Asymmetric Universe
• Inflation, Neutrino Baryogenesis, and (S)Neutrino-Induced Baryogenesis
• Baryogenesis from mixed particle decays
• Re-Examination of Generation of Baryon and Lepton Number Asymmetries by Heavy Particle Decay
• Finite temperature effects on CP violating asymmetries
• Unstable particle mixing and CP violation in weak decays

Cited by in corpus (44)

• Leptogenesis for Pedestrians
• Baryogenesis through leptogenesis
• Flavour Matters in Leptogenesis
• CP Asymmetry in Majorana Neutrino Decays
• Heavy Majorana Neutrinos and Baryogenesis
• Systematic approach to leptogenesis in nonequilibrium QFT: vertex contribution to the CP-violating parameter
• Efficiency and maximal CP-asymmetry of scalar triplet leptogenesis
• Spontaneous B-L Breaking as the Origin of the Hot Early Universe
• Resonant enhancement in leptogenesis
• Systematic approach to leptogenesis in nonequilibrium QFT: self-energy contribution to the CP-violating parameter
• Systematic approach to thermal leptogenesis
• Truly Minimal Left-Right Model of Quark and Lepton Masses
• Further Considerations on the CP Asymmetry in Heavy Majorana Neutrino Decays
• Low and High Energy Phenomenology of Quark-Lepton Complementarity Scenarios
• Breaking of L_mu - L_tau Flavor Symmetry, Lepton Flavor Violation and Leptogenesis
• Leptogenesis with small violation of B-L
• Falsifying leptogenesis for a TeV scale $W_R^{\pm }$ at the LHC
• A cosmological pathway to testable leptogenesis
• Leptogenesis and the Higgs Portal
• On fast CP violating interactions in leptogenesis
• CP Asymmetries and Higher-Order Unitarity Relations
• Leptogenesis with virtual Majorana neutrinos
• Leptogenesis in crossing and runaway regimes
• Cutting rules on a cylinder: a bottom-up approach to quantum kinetic theory for the early universe
• Resonant leptogenesis in (2,2) inverse see-saw realisation
• The $eejj$ Excess Signal at the LHC and Constraints on Leptogenesis
• Searches for heavy neutrinos at multi-TeV muon collider : a resonant leptogenesis perspective
• The B-L Phase Transition: Implications for Cosmology and Neutrinos
• Split neutrinos - leptogenesis, dark matter and inflation
• CP violation in mixing and oscillations for leptogenesis with quasi-degenerate neutrinos
• Mass-derivative relations and unitarity constraints for $CP$ asymmetries at finite temperature
• Neutrino helicity asymmetries in leptogenesis
• Starobinsky-Type B-L Higgs Inflation Leading Beyond MSSM
• Dirac leptogenesis from asymmetry wash-in via scatterings
• CP violation in mixing and oscillations for leptogenesis II: the highly degenerate case
• Minimal effective theory for leptogenesis, dark matter, and neutrino masses
• Reconciling resonant leptogenesis and baryogenesis via neutrino oscillations
• Light sterile neutrino and leptogenesis
• On different approaches to freeze-in and freeze-out leptogenesis with quasi-degenerate neutrinos
• Cutting rules on a cylinder and simplified diagrammatic approach to $CP$ violation in quantum kinetic theory
• Neutrino Spin Flavor Precession and Leptogenesis
• $CPT$ and unitarity constraints for higher-order $CP$ asymmetries at finite temperature
• Asymmetric dark matter from semi-annihilation: unitarity constraints and long-lived final states
• Unitarity and CP violation in leptogenesis at NLO: general considerations and top Yukawa contributions