Probing $0νββ$ and $μ\to eγ$ via Fully Determined Dirac Mass Terms in LRSM with Double Seesaw
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
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2025
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| _version_ | 1866912867858513920 |
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| author | Adarsh, Pratik Banerjee, Rajrupa Sahu, Purushottam Patel, Utkarsh Patra, Sudhanwa |
| author_facet | Adarsh, Pratik Banerjee, Rajrupa Sahu, Purushottam Patel, Utkarsh Patra, Sudhanwa |
| contents | Neutrinoless double beta decay ($0νββ$) and charged lepton flavor violation (cLFV) experiments provide promising avenues to probe new physics contributions from extended neutrino sectors in beyond Standard Model (BSM) scenarios. We consider a Left-Right Symmetric Model (LRSM) extended with three generations of sterile neutrinos to realize a double type-I seesaw mechanism for light neutrino mass generation. The double seesaw induces maximal lepton number violation in the right-handed sector and facilitates enhanced Majorana masses for right-handed neutrinos, thereby leading to their dominant contributions in both cLFV and $0νββ$ processes. We perform a comprehensive exploration of the parameter space for new-physics contributions to the cLFV decay $μ\to e γ$ and to $0νββ$, considering two different textures for the Dirac mass matrices: (i) a symmetry-motivated limit with $M_D \propto \mathbb{1}$, and (ii) a texture fully determined by the model framework. A detailed analysis of the common parameter regions accessible to current experiments like KamLAND-Zen and LEGEND-200, and upcoming experiments, such as MEG-II and LEGEND-1000, is presented, underscoring the phenomenological relevance of this framework. Our results aim to provide optimistic benchmarks for future searches targeting right-handed current-mediated neutrino interactions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_15893 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Probing $0νββ$ and $μ\to eγ$ via Fully Determined Dirac Mass Terms in LRSM with Double Seesaw Adarsh, Pratik Banerjee, Rajrupa Sahu, Purushottam Patel, Utkarsh Patra, Sudhanwa High Energy Physics - Phenomenology High Energy Physics - Experiment Neutrinoless double beta decay ($0νββ$) and charged lepton flavor violation (cLFV) experiments provide promising avenues to probe new physics contributions from extended neutrino sectors in beyond Standard Model (BSM) scenarios. We consider a Left-Right Symmetric Model (LRSM) extended with three generations of sterile neutrinos to realize a double type-I seesaw mechanism for light neutrino mass generation. The double seesaw induces maximal lepton number violation in the right-handed sector and facilitates enhanced Majorana masses for right-handed neutrinos, thereby leading to their dominant contributions in both cLFV and $0νββ$ processes. We perform a comprehensive exploration of the parameter space for new-physics contributions to the cLFV decay $μ\to e γ$ and to $0νββ$, considering two different textures for the Dirac mass matrices: (i) a symmetry-motivated limit with $M_D \propto \mathbb{1}$, and (ii) a texture fully determined by the model framework. A detailed analysis of the common parameter regions accessible to current experiments like KamLAND-Zen and LEGEND-200, and upcoming experiments, such as MEG-II and LEGEND-1000, is presented, underscoring the phenomenological relevance of this framework. Our results aim to provide optimistic benchmarks for future searches targeting right-handed current-mediated neutrino interactions. |
| title | Probing $0νββ$ and $μ\to eγ$ via Fully Determined Dirac Mass Terms in LRSM with Double Seesaw |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2508.15893 |