Neutrino Mass Hierarchy

Abstract

The neutrino mass hierarchy, i.e., whether the ${\nu }_3$ neutrino mass eigenstate is heavier or lighter than the ${\nu }_1$ and ${\nu }_2$ mass eigenstates, is one of the remaining undetermined fundamental features of the neutrino Standard Model. Its determination would represent an important step in the formulation of the generalized model, and would have a profound impact on the quest of the nature of neutrinos (Dirac or Majorana) and the search for a theory of flavor. In this review, we summarize the status of experimental and theoretical work in this field and explore the future opportunities that emerge in light of the recently discovered non-zero and relatively large third neutrino mixing angle ${\theta }_{13}$.

48 pages, 34 figures, published in "Progress in Particle and Nuclear Physics (PPNP)", added a few references

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Cited by in corpus (4)

• Neutrino oscillations: the rise of the PMNS paradigm
• Neutrino Flavor Evolution in Binary Neutron Star Merger Remnants
• Long-Baseline Neutrino Experiments
• Predictive Dirac and Majorana Neutrino Mass Textures from $SU(6)$ Grand Unified Theories