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The eV-Scale Sterile Neutrino and Neutrinoless Double Beta Decay

Priya, Simran Arora, B. C. Chauhan

Abstract

In short-baseline experiments such as LSND and MiniBooNE, an excess of electron neutrinos has been observed, originating from a muon neutrino beam. To address this anomaly, in the line of many works, we investigate various neutrino mixing schemes involving eV-scale sterile neutrinos alongside three active neutrinos. Using updated experimental and global fit data, we studied neutrinoless double beta decay for three different schemes such as 3+1, 1 + 3, and 2 + 2, which involve one sterile neutrino and three active neutrinos. We have done analysis of these schemes for normal hierarchy (NH) as well as for inverted hierarchy (IH) frameworks, and constrained the sterile neutrino mass in light of current and future neutrinoless double beta decay experiments. The 3+1 scheme is found to be the most viable and at the level of $3σ$ the mass of sterile neutrino with respect to the lightest neutrino mass ($m_{\text{lightest}}$) is restricted to $4.75~eV$ for the NH and $4.72~eV$ for the IH. Additionally, the limits on the sum of four neutrino masses are determined to be $4.81~eV$ for the normal hierarchy and $4.78~eV$ for the inverted hierarchy. The updated analysis of all these schemes would help us in understanding physics governing neutrinoless double beta decay and limit on the mass of sterile neutrinos.

The eV-Scale Sterile Neutrino and Neutrinoless Double Beta Decay

Abstract

In short-baseline experiments such as LSND and MiniBooNE, an excess of electron neutrinos has been observed, originating from a muon neutrino beam. To address this anomaly, in the line of many works, we investigate various neutrino mixing schemes involving eV-scale sterile neutrinos alongside three active neutrinos. Using updated experimental and global fit data, we studied neutrinoless double beta decay for three different schemes such as 3+1, 1 + 3, and 2 + 2, which involve one sterile neutrino and three active neutrinos. We have done analysis of these schemes for normal hierarchy (NH) as well as for inverted hierarchy (IH) frameworks, and constrained the sterile neutrino mass in light of current and future neutrinoless double beta decay experiments. The 3+1 scheme is found to be the most viable and at the level of the mass of sterile neutrino with respect to the lightest neutrino mass () is restricted to for the NH and for the IH. Additionally, the limits on the sum of four neutrino masses are determined to be for the normal hierarchy and for the inverted hierarchy. The updated analysis of all these schemes would help us in understanding physics governing neutrinoless double beta decay and limit on the mass of sterile neutrinos.
Paper Structure (7 sections, 13 equations, 6 figures, 4 tables)

This paper contains 7 sections, 13 equations, 6 figures, 4 tables.

Table of Contents

  1. Introduction
  2. Different Possible Active-Sterile Neutrino Schemes
  3. Effective Majorana Mass in 3+1 Schemes
  4. 3+1 Scheme (NH)
  5. 3+1 Scheme (IH)
  6. Results and Discussions
  7. Conclusions

Figures (6)

  • Figure 1: Different Sub schemes in 3+1, 1+3 and 2+2 Schemes (NH)
  • Figure 2: Different Sub schemes in 3+1, 1+3, 2+2 Schemes (IH)
  • Figure 3: Effective Majorana mass as a function of lightest mass $m_{\text{lightest}}$ (a, c) and sum of masses $\Sigma$ (b, d) for 3+1 scheme (NH) for 1 $\sigma$ and 3 $\sigma$ ranges
  • Figure 4: Effective Majorana mass as a function of lightest mass $m_{\text{lightest}}$ (a, c) and sum of masses $\Sigma$ (b, d) for 3+1 scheme (IH) for 1 $\sigma$ and 3 $\sigma$ ranges
  • Figure 5: Effective Majorana mass as a function of lightest mass $m_{\text{lightest}}$ for 3+1 scheme (NH) for 3 $\sigma$ ranges with third mass squared difference predicted by the NEUTRINO-4 experiment
  • ...and 1 more figures