Radiative generation of non-zero <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msub><mml:mrow><mml:mi>θ</mml:mi></mml:mrow><mml:mrow><mml:mn>13</mml:mn></mml:mrow></mml:msub></mml:math> in MSSM with broken <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si2.gif" overflow="scroll"><mml:msub><mml:mrow><mml:mi>A</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:math> flavor symmetry

To understand the observed pattern of neutrino masses and mixing as well as to account for the dark matter we propose a hybrid scoto-seesaw model based on the A4 discrete flavor symmetry. In this setup, including at least two heavy right-handed neutrinos is essential to employ the discrete flavor symmetry that mimics once popular tribimaximal neutrino mixing at the leading order via type-I seesaw. The scotogenic contribution then acts as a critical deviation to reproduce the observed value of the reactor mixing angle θ13 (within the trimaximal mixing scheme) and to accommodate potential dark matter candidates, pointing towards a common origin of θ13 and dark matter. The model predicts the atmospheric angle to be in the upper octant, excludes some regions on the Dirac CP phase, and restricts the Majorana phases too. Further, normal and inverted mass hierarchies can be distinguished for specific values of the relative phases associated with the complex light neutrino mass matrix. Owing to the considered flavor symmetry, contributions coming from the scotogenic mechanism towards the lepton flavor violating decays such as μ → eγ, τ → eγ vanish, and a lower limit on the second right-handed neutrino mass can be obtained. Prediction for the effective mass parameter appearing in the neutrinoless double beta decay falls within the sensitivity of future experiments such as LEGEND-1k and nEXO.

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Common origin of θ13 and dark matter within the flavor symmetric scoto-seesaw framework

Ganguly

Gluza

Karmakar

2022

J. High Energ. Phys.

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Radiative generation of realistic neutrino mixing with A4

Pramanick

2021

Nuclear Physics B

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Nonzeroθ13and leptogenesis in a type-I seesaw model withA4symmetry

Karmakar

Sil

2015

Phys. Rev. D

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In the light of recent discovery of nonzero θ 13 , we have analyzed the Altarelli-Feruglio A 4 flavor symmetry model extended with additional flavon. The inclusion of the new field leads to the deviation from exact tri-bimaximal neutrino mixing pattern in the context of type-I see-saw by producing a nonzero θ 13 consistent with the recent experimental results at the leading order. A sum rule for light neutrino masses is also obtained in this context.The set-up constraints the two Majorana phases involved in the lepton mixing matrix in terms of A 4 parameter space. We have shown that a nonzero lepton asymmetry can be generated while next-to-leading order contributions to the neutrino Yukawa couplings are considered. The two Majorana phases play crucial role in CP-asymmetry parameter and the involvement of θ 13 in it, is exercised.

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Radiative generation of non-zero θ13 in MSSM with broken A4 flavor symmetry

Cited by 4 publications

References 54 publications

Common origin of θ13 and dark matter within the flavor symmetric scoto-seesaw framework

Common origin of θ13 and dark matter within the flavor symmetric scoto-seesaw framework

Radiative generation of realistic neutrino mixing with A4

Nonzeroθ13and leptogenesis in a type-I seesaw model withA4symmetry

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