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<p>Neutrinoless double beta decay (0<i>νββ</i>) 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 0<i>νββ</i> processes. We perform a comprehensive exploration of the parameter space for new-physics contributions to the cLFV decay <i>μ</i> → <i>eγ</i> and to 0<i>νββ</i>, considering two different textures for the Dirac mass matrices: (i) a <i>symmetry-motivated</i> limit with <i>M</i><sub><i>D</i></sub> ∝ 𝟙, and (ii) a texture <i>fully determined</i> 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.</p>

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Probing 0νββ and μ → eγ via fully determined Dirac mass terms in LRSM with double seesaw

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月4日

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  • Pratik Adarsh,
  • Rajrupa Banerjee,
  • Purushottam Sahu,
  • Utkarsh Patel,
  • Sudhanwa Patra

摘要

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 → eγ and to 0νββ, considering two different textures for the Dirac mass matrices: (i) a symmetry-motivated limit with MD ∝ 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.