Spontaneous CP violation and horizontal symmetry in the MSSM: toward lepton flavor naturalness
Abstract We study the contributions of supersymmetric models with a U(1) horizontal symmetry and only spontaneous CP breaking to various lepton flavor observables, such as μ → eγ and the electron electric dipole moment. We show that both a horizontal symmetry and a lack of explicit CP violation can...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2021-09-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP09(2021)031 |
| _version_ | 1818582658363424768 |
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| author | Daniel Aloni Pouya Asadi Yuichiro Nakai Matthew Reece Motoo Suzuki |
| author_facet | Daniel Aloni Pouya Asadi Yuichiro Nakai Matthew Reece Motoo Suzuki |
| author_sort | Daniel Aloni |
| collection | DOAJ |
| description | Abstract We study the contributions of supersymmetric models with a U(1) horizontal symmetry and only spontaneous CP breaking to various lepton flavor observables, such as μ → eγ and the electron electric dipole moment. We show that both a horizontal symmetry and a lack of explicit CP violation can alleviate the existing bounds from such observables. The undetermined O $$ \mathcal{O} $$ (1) coefficients in such mass matrix models muddle the interpretation of the bounds from various flavor observables. To overcome this, we define a new fine-tuning measure for different observables in such setups. This allows us to study how naturally the observed IR flavor observables can emerge from a given mass matrix model. We use our flavor-naturalness measure in study of our supersymmetric models and quantify the degree of fine tuning required by the bounds from various lepton flavor observables at each mass scale of sleptons, neutralinos, and charginos. |
| first_indexed | 2024-12-16T07:52:53Z |
| format | Article |
| id | doaj.art-883d18cab0564ad3ab28267221cabf18 |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-16T07:52:53Z |
| publishDate | 2021-09-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-883d18cab0564ad3ab28267221cabf182022-12-21T22:38:49ZengSpringerOpenJournal of High Energy Physics1029-84792021-09-012021914210.1007/JHEP09(2021)031Spontaneous CP violation and horizontal symmetry in the MSSM: toward lepton flavor naturalnessDaniel Aloni0Pouya Asadi1Yuichiro Nakai2Matthew Reece3Motoo Suzuki4Department of Physics, Boston UniversityCenter for Theoretical Physics, Massachusetts Institute of TechnologyTsung-Dao Lee Institute and School of Physics and Astronomy, Shanghai Jiao Tong UniversityDepartment of Physics, Harvard UniversityTsung-Dao Lee Institute and School of Physics and Astronomy, Shanghai Jiao Tong UniversityAbstract We study the contributions of supersymmetric models with a U(1) horizontal symmetry and only spontaneous CP breaking to various lepton flavor observables, such as μ → eγ and the electron electric dipole moment. We show that both a horizontal symmetry and a lack of explicit CP violation can alleviate the existing bounds from such observables. The undetermined O $$ \mathcal{O} $$ (1) coefficients in such mass matrix models muddle the interpretation of the bounds from various flavor observables. To overcome this, we define a new fine-tuning measure for different observables in such setups. This allows us to study how naturally the observed IR flavor observables can emerge from a given mass matrix model. We use our flavor-naturalness measure in study of our supersymmetric models and quantify the degree of fine tuning required by the bounds from various lepton flavor observables at each mass scale of sleptons, neutralinos, and charginos.https://doi.org/10.1007/JHEP09(2021)031Beyond Standard ModelSupersymmetric Standard ModelCP violation |
| spellingShingle | Daniel Aloni Pouya Asadi Yuichiro Nakai Matthew Reece Motoo Suzuki Spontaneous CP violation and horizontal symmetry in the MSSM: toward lepton flavor naturalness Journal of High Energy Physics Beyond Standard Model Supersymmetric Standard Model CP violation |
| title | Spontaneous CP violation and horizontal symmetry in the MSSM: toward lepton flavor naturalness |
| title_full | Spontaneous CP violation and horizontal symmetry in the MSSM: toward lepton flavor naturalness |
| title_fullStr | Spontaneous CP violation and horizontal symmetry in the MSSM: toward lepton flavor naturalness |
| title_full_unstemmed | Spontaneous CP violation and horizontal symmetry in the MSSM: toward lepton flavor naturalness |
| title_short | Spontaneous CP violation and horizontal symmetry in the MSSM: toward lepton flavor naturalness |
| title_sort | spontaneous cp violation and horizontal symmetry in the mssm toward lepton flavor naturalness |
| topic | Beyond Standard Model Supersymmetric Standard Model CP violation |
| url | https://doi.org/10.1007/JHEP09(2021)031 |
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