Implications of the Dark LMA solution and Fourth Sterile Neutrino for Neutrino-less Double Beta Decay

Deepthi, K. N.; Goswami, Srubabati; N., Vishnudath K.; Poddar, Tanmay Kumar

doi:10.48550/arxiv.1909.09434

Cited by 3 publications

(4 citation statements)

References 57 publications

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“…This degenerate solution to the solar mixing problem is often referred to as dark LMA (DLMA) solution in the literature [9][10][11]. Several studies have been done in the context of this DLMA solution, for example, the impact of DLMA in determining neutrino mass hierarchy at neutrino oscillation experiments [11][12][13][14][15], the impact of DLMA on 0νββ lifetime with three neutrinos [16], 3 + 1 neutrinos [17]. Further studies related to resolving the degeneracy were done by the authors of [10,18] while the constraints from COHERENT experiment (coherent neutrino nucleus scattering data) on DLMA solution were studied in [19,20].…”

Section: Introductionmentioning

confidence: 99%

Revisiting Majorana neutrino textures in the light of dark LMA

Borgohain

Borah

2020

J. Phys. G: Nucl. Part. Phys.

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We study the possibility of texture zeros in Majorana light neutrino mass matrix in the light of dark large mixing angle (DLMA) solution to solar neutrino problem where solar mixing angle (sin2 θ 12 ≃ 0.7) lies in the second octant instead of first octant in standard large mixing angle (LMA) scenario (sin2 θ 12 ≃ 0.3). In three neutrino scenario, we find that LMA and DLMA solutions lead to different set of allowed and disallowed textures with one and two zeros. While being consistent with existing bounds from neutrino oscillation data, neutrinoless double beta decay and cosmology these allowed textures also lead to interesting correlations among light neutrino parameters which can distinguish LMA from DLMA solution. We also check the implications for texture zeros in 3 + 1 neutrino scenario using both LMA and DLMA solutions. While LMA and DLMA solutions do not play decisive role in ruling out texture zeros in this case, they do give rise to distinct predictions and correlations between light neutrino parameters.

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Section: Introductionmentioning

confidence: 99%

Revisiting Majorana neutrino textures in the light of dark LMA

Borgohain

Borah

2020

J. Phys. G: Nucl. Part. Phys.

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“…As pointed out above, the combined JUNO [60] measurement and Daya Bay [62,63] can significantly reduce the uncertainties from the oscillation parameters to make them negligibly small compared with the uncertainties from the decay measurement itself. So, we fix the oscillation parameters ( , , , and ) to their current best-fit values [10,11] in the following discussions.…”

Section: The Solar Octantmentioning

confidence: 99%

“…The two Majorana CP phases are then determined/constrained within some contour. Again, the JUNO [60] and Daya Bay [63] experiments can play an important role by significantly reducing the experimental uncertainties from the oscillation parameters.…”

Section: The Two Majorana Cp Phasesmentioning

confidence: 99%

Phenomenological advantages of the normal neutrino mass ordering *

Zhu

2020

Chinese Phys. C

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The preference of the normal neutrino mass ordering from the recent cosmological constraint and the global fit of neutrino oscillation experiments does not seem like a wise choice at first glance since it obscures the neutrinoless double beta decay and hence the Majorana nature of neutrinos. Contrary to this naive expectation, we point out that the actual situation is the opposite. The normal neutrino mass ordering opens the possibility of excluding the higher solar octant and simultaneously measuring the two Majorana CP phases in future experiments. Especially, the funnel region will completely disappear if the solar mixing angle takes the higher octant. The combined precision measurement by the JUNO and Daya Bay experiments can significantly reduce the uncertainty in excluding the higher octant. With a typical sensitivity on the effective mass , the neutrinoless double beta decay experiment can tell if the funnel region really exists and hence exclude the higher solar octant. With the sensitivity further improved to sub-meV, the two Majorana CP phases can be simultaneously determined. Thus, the normal neutrino mass ordering clearly shows phenomenological advantages over the inverted one.

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“…It is shown that this DLMA solution is the manifestation of a generalized hierarchy degeneracy [5,[8][9][10]. In the study of neutrino less double beta decay, impact of the DLMA solution on the effective neutrino mass has been highlighted in [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Implications of the Dark-LMA solution for neutrino mass matrices

Ghosh,

Goswami,

Mukherjee

2020

Preprint

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In this work we have re-investigated two different kinds of texture zero ansatz of the low energy neutrino mass matrix in view of the Dark-Large-Mixing-Angle (DLMA) solution of the solar neutrino problem which can arise in the presence of non-standard interactions. In particular we revisit the cases of (i) one zero mass matrices when the lowest neutrino mass is zero and (ii) one zero texture with a vanishing minor. In our study we find that for most of the cases, the texture zero conditions which are allowed for the LMA solution, are also allowed for the DLMA solution. However, we found two textures belonging to the case of one zero texture with a vanishing minor where LMA solution does not give a viable solution whereas DLMA solution does. We analyze all the possible texture zero cases belonging to these two kinds of texture zero structures in detail and present correlations between different parameters. We also present the predictions for the effective neutrino mass governing neutrino-less double beta decay for the allowed textures.

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Implications of the Dark LMA solution and Fourth Sterile Neutrino for Neutrino-less Double Beta Decay

Cited by 3 publications

References 57 publications

Revisiting Majorana neutrino textures in the light of dark LMA

Revisiting Majorana neutrino textures in the light of dark LMA

Phenomenological advantages of the normal neutrino mass ordering *

Implications of the Dark-LMA solution for neutrino mass matrices

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