A new type of lepton seesaw model in a modular $A_4$ symmetry
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866908569488588800 |
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| author | Nomura, Takaaki Okada, Hiroshi |
| author_facet | Nomura, Takaaki Okada, Hiroshi |
| contents | We propose a new type of lepton seesaw model introducing a modular $A_4$ flavor symmetry in which isospin doublet vector fermions play an important role in constructing seesaw mechanisms for both the charged-lepton mass matrix and the neutrino one. The charged-lepton mass matrix is induced via the Dirac seesaw with a two-by-two block mass matrix. On the other hand, the neutrino mass matrix is generated via a seesaw with four-by-four block mass matrix where the right-handed neutral fermions are also added. Remarkably the neutral fermion mass matrix provides us a new type of seesaw formula for active neutrino mass. Through our chi square analysis, we find some tendencies about observables focusing on two fixed points $τ=i,\ ω$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_19251 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A new type of lepton seesaw model in a modular $A_4$ symmetry Nomura, Takaaki Okada, Hiroshi High Energy Physics - Phenomenology We propose a new type of lepton seesaw model introducing a modular $A_4$ flavor symmetry in which isospin doublet vector fermions play an important role in constructing seesaw mechanisms for both the charged-lepton mass matrix and the neutrino one. The charged-lepton mass matrix is induced via the Dirac seesaw with a two-by-two block mass matrix. On the other hand, the neutrino mass matrix is generated via a seesaw with four-by-four block mass matrix where the right-handed neutral fermions are also added. Remarkably the neutral fermion mass matrix provides us a new type of seesaw formula for active neutrino mass. Through our chi square analysis, we find some tendencies about observables focusing on two fixed points $τ=i,\ ω$. |
| title | A new type of lepton seesaw model in a modular $A_4$ symmetry |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2503.19251 |