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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2504.00579 |
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| _version_ | 1866908292774625280 |
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| author | Dávila, Juan Manuel Karan, Anirban Passemar, Emilie Pich, Antonio Silva, Luiz Vale |
| author_facet | Dávila, Juan Manuel Karan, Anirban Passemar, Emilie Pich, Antonio Silva, Luiz Vale |
| contents | We discuss model-independent contributions to the electron EDM, focusing on those contributions emerging from a heavy scalar sector linearly realized. To provide a concrete new physics realization, we investigate the aligned 2HDM in the decoupling limit. We point out that logarithmically enhanced contributions generated from Barr-Zee diagrams with a fermion loop are present in the aligned 2HDM, an effect encoded in the decoupling limit by effective dimension-6 operators, through the mixing of four-fermion into dipole operators. The same large logarithms are absent in specific 2HDMs where a $\mathcal Z_2$ symmetry is enforced, which thus controls the basis of effective operators relevant for calculating new physics contributions to EDMs. In other words, the $\mathcal Z_2$ symmetry acts as a suppression mechanism. In the aligned 2HDM these contributions are proportional to sources of CP violation that are potentially large, and absent in presence of the $\mathcal Z_2$ symmetry. We then investigate the impact on the electron EDM of this extended set of free parameters. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_00579 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The electron EDM in the decoupling limit of the aligned 2HDM Dávila, Juan Manuel Karan, Anirban Passemar, Emilie Pich, Antonio Silva, Luiz Vale High Energy Physics - Phenomenology We discuss model-independent contributions to the electron EDM, focusing on those contributions emerging from a heavy scalar sector linearly realized. To provide a concrete new physics realization, we investigate the aligned 2HDM in the decoupling limit. We point out that logarithmically enhanced contributions generated from Barr-Zee diagrams with a fermion loop are present in the aligned 2HDM, an effect encoded in the decoupling limit by effective dimension-6 operators, through the mixing of four-fermion into dipole operators. The same large logarithms are absent in specific 2HDMs where a $\mathcal Z_2$ symmetry is enforced, which thus controls the basis of effective operators relevant for calculating new physics contributions to EDMs. In other words, the $\mathcal Z_2$ symmetry acts as a suppression mechanism. In the aligned 2HDM these contributions are proportional to sources of CP violation that are potentially large, and absent in presence of the $\mathcal Z_2$ symmetry. We then investigate the impact on the electron EDM of this extended set of free parameters. |
| title | The electron EDM in the decoupling limit of the aligned 2HDM |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2504.00579 |