Neutrino oscillations and the seesaw origin of neutrino mass

TL;DR

This paper reviews neutrino oscillations, emphasizing the importance of considering non-unitarity in the lepton mixing matrix to better understand the seesaw mechanism and guide future CP violation experiments.

Contribution

It highlights the significance of non-unitarity effects in neutrino oscillations and their implications for understanding the seesaw origin of neutrino mass.

Findings

CP effects are hard to extract with unitarity violation

Restricting non-unitarity can reveal the seesaw scale

Guides future leptonic CP violation studies

Abstract

The historical discovery of neutrino oscillations using solar and atmospheric neutrinos, and subsequent accelerator and reactor studies, has brought neutrino physics to the precision era. We note that CP effects in oscillation phenomena could be difficult to extract in the presence of unitarity violation. As a result upcoming dedicated leptonic CP violation studies should take into account the non-unitarity of the lepton mixing matrix. Restricting non-unitarity will shed light on the seesaw scale, and thereby guide us towards the new physics responsible for neutrino mass generation.