Probing leptogenesis with GeV-scale sterile neutrinos at LHCb and BELLE II

TL;DR

This paper explores how current experiments like LHCb and BELLE II can detect GeV-scale sterile neutrinos, shedding light on leptogenesis and matter-antimatter asymmetry through CP-violating oscillations.

Contribution

It demonstrates the potential of existing laboratory experiments to probe leptogenesis in a three-neutrino type-I seesaw model without requiring mass degeneracy.

Findings

Right-handed neutrinos can be detected in meson decays at BELLE II and LHCb.

Leptogenesis can occur via CP-violating flavor oscillations in the GeV mass range.

No degeneracy in Majorana masses is necessary for successful leptogenesis.

Abstract

We show that existing laboratory experiments have the potential to unveil the origin of matter by probing leptogenesis in the type-I seesaw model with three right-handed neutrinos and Majorana masses in the GeV range. The baryon asymmetry is generated by CP-violating flavour oscillations during the production of the right-handed neutrinos. In contrast to the case with only two right-handed neutrinos, no degeneracy in the Majorana masses is required. The right-handed neutrinos can be found in meson decays at BELLE II and LHCb.