Calculable Cosmological CP Violation and Resonant Leptogenesis

TL;DR

This paper explores how quantum corrections in an extended MSSM with degenerate right-handed neutrinos can generate the observed baryon asymmetry through resonant leptogenesis, linking CP violation to neutrino properties.

Contribution

It demonstrates that quantum corrections induce lepton asymmetry at one-loop level in a specific neutrino model, connecting CP violation to cosmological baryon asymmetry.

Findings

Lepton asymmetry is generated at 1-loop level.

Tau lepton Yukawa coupling plays a decisive role.

Resonant leptogenesis successfully explains baryon asymmetry.

Abstract

Within the extension of MSSM by two right handed neutrinos, which masses are degenerate at tree level, we address the issue of leptogenesis. Investigating the quantum corrections in details, we show that the lepton asymmetry is induced at 1-loop level and decisive role is played by the tau lepton Yukawa coupling. On a concrete and predictive neutrino model, which enables to predict the CP violating $\delta $ phase and relate it to the cosmological CP asymmetry, we demonstrate that the needed amount of the baryon asymmetry is generated via the resonant leptogenesis.