Majoron-Driven Leptogenesis in Gauged $U(1)_{L_μ-L_τ}$ Model
Fuente:
arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866917835741069312 |
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| author | Wada, Juntaro |
| author_facet | Wada, Juntaro |
| contents | We propose a novel leptogenesis scenario in the gauged $U(1)_{L_μ-L_τ}$ model. Achieving successful leptogenesis in the $U(1)_{L_μ-L_τ}$ symmetric phase is challenging due to the absence of a CP phase, caused by restriction from the gauge symmetry. To overcome this issue, we introduce an additional global symmetry, $U(1)_{B-L}$, and a scalar field $Φ$ responsible for breaking this symmetry. Through the kinetic misalignment mechanism, the majoron field associated with $U(1)_{B-L}$ symmetry breaking has a kinetic motion in the early universe. Subsequently, time-dependent majoron field background induces the background CP phase dynamically, leading to successful leptogenesis in the $U(1)_{L_μ-L_τ}$ symmetric phase. Furthermore, majoron itself serves as a dark matter candidate in this scenario. As one of the phenomenological applications, we consider the model that can also explain the muon $g-2$ anomaly. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_10283 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Majoron-Driven Leptogenesis in Gauged $U(1)_{L_μ-L_τ}$ Model Wada, Juntaro High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics We propose a novel leptogenesis scenario in the gauged $U(1)_{L_μ-L_τ}$ model. Achieving successful leptogenesis in the $U(1)_{L_μ-L_τ}$ symmetric phase is challenging due to the absence of a CP phase, caused by restriction from the gauge symmetry. To overcome this issue, we introduce an additional global symmetry, $U(1)_{B-L}$, and a scalar field $Φ$ responsible for breaking this symmetry. Through the kinetic misalignment mechanism, the majoron field associated with $U(1)_{B-L}$ symmetry breaking has a kinetic motion in the early universe. Subsequently, time-dependent majoron field background induces the background CP phase dynamically, leading to successful leptogenesis in the $U(1)_{L_μ-L_τ}$ symmetric phase. Furthermore, majoron itself serves as a dark matter candidate in this scenario. As one of the phenomenological applications, we consider the model that can also explain the muon $g-2$ anomaly. |
| title | Majoron-Driven Leptogenesis in Gauged $U(1)_{L_μ-L_τ}$ Model |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2404.10283 |