Signatures of Type-I Seesaw in Neutrino Oscillation Phenomenology
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| Format: | Preprint |
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2026
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| author | Pattanaik, Suka Sriyansu Mishra, Sasmita |
| author_facet | Pattanaik, Suka Sriyansu Mishra, Sasmita |
| contents | We investigate the low-energy phenomenology of the Type-I seesaw mechanism within a 3+3 framework containing three active and three sterile neutrinos. Using the exact seesaw relation as a bridge between the high-scale sterile-sector parameters and the standard oscillation observables, we perform a comprehensive Monte Carlo scan of the 21-dimensional sterile parameter space, retaining only those configurations consistent with current neutrino oscillation data within $3σ$. For the viable parameter points, we simulate the modified neutrino oscillation probabilities and event rates at the long-baseline experiments DUNE and NO$ν$A, and the medium-baseline reactor experiment JUNO, quantifying their sensitivity to sterile neutrino effects across the eV--GeV mass range. We find that eV-scale sterile neutrinos produce pronounced spectral distortions, while heavier states decouple progressively from oscillation experiments. In parallel, we confront the seesaw predictions with complementary probes: cosmological bounds on $\sum m_i$, the kinematic mass $m_β$ from beta decay, the effective Majorana mass $|m_{ββ}|$ from neutrinoless double beta decay ($0νββ$), and the charged-lepton-flavor-violating branching ratio $\text{BR}(μ\to eγ)$. The combination of all constraints significantly narrows the allowed parameter space: the predicted sum of neutrino masses clusters at $\sum m_i \sim 0.05$--$0.07$~eV, within reach of next-generation cosmological surveys, and eV-scale sterile neutrinos are found to be under significant tension from the current MEG bound on $μ\to eγ$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2603_26094 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Signatures of Type-I Seesaw in Neutrino Oscillation Phenomenology Pattanaik, Suka Sriyansu Mishra, Sasmita High Energy Physics - Phenomenology We investigate the low-energy phenomenology of the Type-I seesaw mechanism within a 3+3 framework containing three active and three sterile neutrinos. Using the exact seesaw relation as a bridge between the high-scale sterile-sector parameters and the standard oscillation observables, we perform a comprehensive Monte Carlo scan of the 21-dimensional sterile parameter space, retaining only those configurations consistent with current neutrino oscillation data within $3σ$. For the viable parameter points, we simulate the modified neutrino oscillation probabilities and event rates at the long-baseline experiments DUNE and NO$ν$A, and the medium-baseline reactor experiment JUNO, quantifying their sensitivity to sterile neutrino effects across the eV--GeV mass range. We find that eV-scale sterile neutrinos produce pronounced spectral distortions, while heavier states decouple progressively from oscillation experiments. In parallel, we confront the seesaw predictions with complementary probes: cosmological bounds on $\sum m_i$, the kinematic mass $m_β$ from beta decay, the effective Majorana mass $|m_{ββ}|$ from neutrinoless double beta decay ($0νββ$), and the charged-lepton-flavor-violating branching ratio $\text{BR}(μ\to eγ)$. The combination of all constraints significantly narrows the allowed parameter space: the predicted sum of neutrino masses clusters at $\sum m_i \sim 0.05$--$0.07$~eV, within reach of next-generation cosmological surveys, and eV-scale sterile neutrinos are found to be under significant tension from the current MEG bound on $μ\to eγ$. |
| title | Signatures of Type-I Seesaw in Neutrino Oscillation Phenomenology |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2603.26094 |