Origin of neutrino masses

Determine the underlying mechanism that generates nonzero neutrino masses in nature and accounts for their small scale relative to charged fermions.

Background

The paper emphasizes that, despite the successes of the Standard Model (SM), neutrino oscillation experiments establish that neutrinos have nonzero masses, which the SM cannot accommodate without extension. It reviews the standard type-I seesaw, which typically requires a very high right-handed neutrino mass scale, and contrasts it with the inverse seesaw (ISS), which allows TeV-scale right-handed neutrinos by introducing a small lepton-number-violating parameter.

Within the Doublet Left-Right Symmetric Model (DLRSM) considered in this work, the ISS mechanism is implemented to generate light neutrino masses while keeping new states potentially accessible at colliders. Although the paper focuses on implications for the muon anomalous magnetic moment, it explicitly acknowledges that the deeper origin of neutrino masses remains an open question.

References

Nonetheless, several open questions remain, including the origin of neutrino masses, the nature of parity violation, and the existence of lepton flavor violation (LFV).

— Implications of the muon anomalous magnetic moment in a Doublet Left-Right Symmetric Model  (2603.28041 - Zeleny-Mora et al., 30 Mar 2026) in Introduction (Section 1)