Speaker
Description
In this talk, we investigate the impact of higher-dimensional operators on low-scale leptogenesis (LG) via oscillations of right-handed neutrinos within the neutrino-extended Standard Model Effective Field Theory ($\nu$SMEFT) and connect with the impact of the same operators on neutrinoless double beta ($0\nu\beta\beta$) decay.
Focusing on a specific dimension-six, lepton number conserving operator, our results reveal that even in the absence of explicit lepton number violation by the operator, it can enhance or suppress the baryon asymmetry of the universe (BAU) by several orders of magnitude, depending on the EFT scale. We further connect these effects to predictions for $0\nu\beta\beta$ decay, demonstrating that the same operator can lead to enhanced decay rates, potentially within reach of the next generation of experiments. Our findings suggest that detecting 0vbb decay and requiring successful low-scale LG within the $\nu$SMEFT could rule out large parts of the available RHN parameter space, pointing towards low RHN masses and low reheating temperatures.
