Implications of the Dark-LMA solution for neutrino mass matrices

Ghosh, Monojit; Goswami, Srubabati; Mukherjee, Ananya

doi:10.1016/j.nuclphysb.2021.115460

Cited by 2 publications

(1 citation statement)

References 40 publications

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“…If the mass ordering turns out to be normal, we do not expect any 0νββ decay signals with a high probability in the near future. A positive signal would mean either new physics contributions [13,[46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63] in |m ee | or an unusual cosmology with large neutrino masses [64][65][66][67]. If the mass ordering turns out to be inverted, in contrast to the current global-fit preference [68][69][70], we will instead have a considerable discovery probability.…”

Section: Introductionmentioning

confidence: 99%

Inference of neutrino nature and Majorana CP phases from $$\mathbf{0}{\nu \beta \beta }$$ decays with inverted mass ordering

Huang

Nath

2022

Eur. Phys. J. C

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Whether the neutrino mass ordering is normal or inverted remains an experimentally open issue in neutrino physics. The knowledge of neutrino mass ordering has great importance for neutrinoless double-beta ($$ 0\nu \beta \beta $$ 0 ν β β ) decay experiments, which can establish the nature of massive neutrinos, i.e., whether they are Dirac or Majorana fermions. Recently, the KamLAND-Zen 800 measurement has reached for the first time the parameter space of the inverted ordering with a vanishing lightest neutrino mass. By assuming the inverted ordering, we attempt to derive the physical information of the neutrino nature and Majorana CP phases from a negative or positive observation of $$ 0\nu \beta \beta $$ 0 ν β β decays in the near future. Moreover, the possibility of extracting the nuclear matrix element in the case of a positive observation is also examined.To avoid the ambiguity from unknown priors of neutrino masses, we adopt the maximum likelihood method instead of the Bayesian approach usually considered in previous works.

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Section: Introductionmentioning

confidence: 99%

Inference of neutrino nature and Majorana CP phases from $$\mathbf{0}{\nu \beta \beta }$$ decays with inverted mass ordering

Huang

Nath

2022

Eur. Phys. J. C

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Investigating two-zero textures of inverse neutrino mass matrix under the lamp post of LMA and LMA-D solutions and symmetry realization

2022

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In this work we have investigated the phenomenological consequences of two-zero textures of inverse neutrino mass matrix ($$M_{\nu }^{-1}$$ M ν - 1 ) in light of the large mixing angle (LMA) and large mixing angle-dark (LMA-D) solutions, later of which originates if neutrinos exhibit non-standard interactions with matter. Out of fifteen possibilities, only seven two-zero textures of $$M_{\nu }^{-1}$$ M ν - 1 are found to be phenomenologically allowed under LMA and/or LMA-D descriptions. In particular, five textures are in consonance with both LMA and LMA-D solutions and are necessarily CP violating while remaining two textures are found to be consistent with LMA solution only. The textures with vanishing (1, 1) element of $$M_{\nu }^{-1}$$ M ν - 1 are, in general, disallowed. All the textures allowed under LMA and LMA-D solutions follow the same neutrino mass hierarchy. Furthermore, textures with vanishing (2, 3) element of $$M_{\nu }^{-1}$$ M ν - 1 are found to be either disallowed or are consistent with LMA description only. We have, also, obtained the implication of the model for $$0\nu \beta \beta $$ 0 ν β β decay amplitude $$|M_{ee}|$$ | M ee | . For most of the textures the calculated $$3\sigma $$ 3 σ lower bound on $$|M_{ee}|$$ | M ee | is $$\mathcal {O}(10^{-2})$$ O ( 10 - 2 ) , which is within the sensitivity reach of $$0\nu \beta \beta $$ 0 ν β β decay experiments. We have, also, proposed a flavor model based on discrete non-Abelian flavor group $$A_4$$ A 4 wherein such textures of $$M_{\nu }^{-1}$$ M ν - 1 can be realized within Type-I seesaw setting.

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Implications of the Dark-LMA solution for neutrino mass matrices

Cited by 2 publications

References 40 publications

Inference of neutrino nature and Majorana CP phases from $$\mathbf{0}{\nu \beta \beta }$$ decays with inverted mass ordering

Inference of neutrino nature and Majorana CP phases from $$\mathbf{0}{\nu \beta \beta }$$ decays with inverted mass ordering

Investigating two-zero textures of inverse neutrino mass matrix under the lamp post of LMA and LMA-D solutions and symmetry realization

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