<p>We present a Majorana scotogenic-like loop framework in which neutrino mass generation and dark matter stability are intrinsically connected to the breaking of the discrete flavor symmetry <i>A</i><sub>4</sub>. This breaking leads to the emergence of the scoto-seesaw mechanism and a <i>Z</i><sub>2</sub> symmetry. This naturally explains the solar and atmospheric mass-squared differences, <InlineEquation ID="IEq1"> <EquationSource Format="MATHML"><math display="inline"> <mtext>∆</mtext> <msubsup> <mi>m</mi> <mi>sol</mi> <mn>2</mn> </msubsup> </math></EquationSource> <EquationSource Format="TEX">\( \Delta {m}_{\textrm{sol}}^2 \)</EquationSource> </InlineEquation> and <InlineEquation ID="IEq2"> <EquationSource Format="MATHML"><math display="inline"> <mtext>∆</mtext> <msubsup> <mi>m</mi> <mi>atm</mi> <mn>2</mn> </msubsup> </math></EquationSource> <EquationSource Format="TEX">\( \Delta {m}_{\textrm{atm}}^2 \)</EquationSource> </InlineEquation>, while simultaneously ensuring dark matter stability. Our model accommodates normal ordering of neutrino masses, with a generalized <i>μ</i>-<i>τ</i> reflection symmetry shaping the structure of leptonic mixing and a lower limit on the lightest neutrino mass. Moreover, the model provides predictions for the octant of <i>θ</i><sub>23</sub> and a strong correlation between <InlineEquation ID="IEq3"> <EquationSource Format="MATHML"><math display="inline"> <mtext>∆</mtext> <msubsup> <mi>m</mi> <mi>sol</mi> <mn>2</mn> </msubsup> </math></EquationSource> <EquationSource Format="TEX">\( \Delta {m}_{\textrm{sol}}^2 \)</EquationSource> </InlineEquation> and <InlineEquation ID="IEq4"> <EquationSource Format="MATHML"><math display="inline"> <mtext>∆</mtext> <msubsup> <mi>m</mi> <mi>atm</mi> <mn>2</mn> </msubsup> </math></EquationSource> <EquationSource Format="TEX">\( \Delta {m}_{\textrm{atm}}^2 \)</EquationSource> </InlineEquation>. This correlation puts a lower bound on the fermionic DM mass. In contrast, scalar dark matter remains viable over a broad mass spectrum. A notable feature is that the low mass regime (~ 15 GeV onwards) survives owing to the presence of efficient co-annihilation channels, which are typically absent in the Majorana scotogenic scenario. Additionally, the model aligns with current and future limits from lepton flavor violation experiments.</p>

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Flavor imprints on novel low mass dark matter

  • Ranjeet Kumar,
  • Hemant Kumar Prajapati,
  • Rahul Srivastava,
  • Sushant Yadav

摘要

We present a Majorana scotogenic-like loop framework in which neutrino mass generation and dark matter stability are intrinsically connected to the breaking of the discrete flavor symmetry A4. This breaking leads to the emergence of the scoto-seesaw mechanism and a Z2 symmetry. This naturally explains the solar and atmospheric mass-squared differences, m sol 2 \( \Delta {m}_{\textrm{sol}}^2 \) and m atm 2 \( \Delta {m}_{\textrm{atm}}^2 \) , while simultaneously ensuring dark matter stability. Our model accommodates normal ordering of neutrino masses, with a generalized μ-τ reflection symmetry shaping the structure of leptonic mixing and a lower limit on the lightest neutrino mass. Moreover, the model provides predictions for the octant of θ23 and a strong correlation between m sol 2 \( \Delta {m}_{\textrm{sol}}^2 \) and m atm 2 \( \Delta {m}_{\textrm{atm}}^2 \) . This correlation puts a lower bound on the fermionic DM mass. In contrast, scalar dark matter remains viable over a broad mass spectrum. A notable feature is that the low mass regime (~ 15 GeV onwards) survives owing to the presence of efficient co-annihilation channels, which are typically absent in the Majorana scotogenic scenario. Additionally, the model aligns with current and future limits from lepton flavor violation experiments.