In Quest of Neutrino Masses at $\mathcal{O}$(eV) Scale

Abstract

Neutrino oscillation and tritium beta decay experiments taken simultaneously into account are able to access the so far imperceptible absolute neutrino masses at the electronvolt level. The neutrino mass spectrum derived in this way is independent of the nature of neutrinos (Dirac or Majorana). Furthermore, the lack of neutrinoless double beta decay gives additional constraints on the Majorana neutrino mass spectrum. A case of three neutrinos is examined. Influence of different solutions to the solar neutrino deficit problem on the results is discussed. Apart from the present situation, four qualitatively distinct experimental situations which are possible in the future are investigated: when the two decay experiments give only upper bounds on effective neutrino masses, when either one of them gives a positive result, and when both give positive results. The discussion is carried out by taking into account the present experimental errors of relevant neutrino parameters as well as their much more precise expected estimations (e.g. by $\nu$ factories). It is shown in which cases the upgraded decay experiments simultaneously with neutrino oscillation data may be able to fix the absolute scale of the neutrino mass spectrum, answer the question of the neutrino nature and put some light on CP phases in the lepton sector.

30 pages, 6 figs, to appear in PRD

References in corpus (2)

• Measurement of the rate of nu_e + d --> p + p + e^- interactions produced by 8B solar neutrinos at the Sudbury Neutrino Observatory
• An Experimentalist's View of Neutrino Oscillations

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• Matter effects and CP violating neutrino oscillations with non-decoupling heavy neutrinos
• The Majorana neutrino masses, neutrinoless double beta decay and nuclear matrix elements
• Super-NOvA: a long-baseline neutrino experiment with two off-axis detectors
• Determining the Neutrino Mass Hierarchy and CP Violation in NOvA with a Second Off-Axis Detector
• Extracting Majorana Properties in the Throat of Neutrinoless Double Beta Decay
• How to interpret a discovery or null result of the $0\nu 2\beta$ decay
• Neutrinoless double beta decay and neutrino mass hierarchies
• Constraining Majorana CP Phase in Precision Era of Cosmology and Double Beta Decay Experiment
• Discriminating the HTM and MLRSM models in collider studies via doubly charged Higgs boson pair production and the subsequent leptonic decays
• Impact of right-handed interactions on the propagation of Dirac and Majorana neutrinos in matter
• Majorana neutrino textures from numerical considerations: the CP conserving case
• Conditions for detecting CP violation via neutrinoless double beta decay