Leptogenesis and composite heavy neutrinos with gauge mediated interactions

Abstract

Leptogenesis is an appealing framework to account for the baryon asymmetry in the universe. To this end physics beyond the Standard Model is demanded. In this paper we investigate the possibility to attain successful leptogenesis with composite Majorana neutrinos. We work in the framework of effective gauge mediated and contact interactions without any reference to an underlying compositeness theory. This approach is the one adopted in all current experimental searches for composite fermions at colliders. In the case of gauge mediated interactions, we calculate the CP asymmetry in heavy composite neutrino decays. Both the direct and indirect CP asymmetry are derived and resonant leptogenesis is also discussed. We find that the Sakharov conditions can be met and, for some choice of the parameters, the correct order of magnitude of the baryon asymmetry is reproduced.

26 pages, 7 figures, references updated

References in corpus (6)

• Leptogenesis
• The Sphaleron Rate in the Minimal Standard Model
• Flavour Covariant Transport Equations: an Application to Resonant Leptogenesis
• Kadanoff-Baym Approach to Flavour Mixing and Oscillations in Resonant Leptogenesis
• CP violation in scatterings, three body processes and the Boltzmann equations for leptogenesis
• CP asymmetry in heavy Majorana neutrino decays at finite temperature: the hierarchical case

Cited by in corpus (4)

• Search for a heavy composite Majorana neutrino in the final state with two leptons and two quarks at sqrt(s) = 13 TeV
• Emergent neutrinos from heavy messengers
• Search for a heavy composite Majorana neutrino in events with dilepton signatures from proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Leptogenesis from composite singlets