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 an...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
Springer Berlin Heidelberg
2021
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| Online Access: | https://hdl.handle.net/1721.1/136753 |
| _version_ | 1811086225794138112 |
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| author | Aloni, Daniel Asadi, Pouya Nakai, Yuichiro Reece, Matthew Suzuki, Motoo |
| author2 | Massachusetts Institute of Technology. Center for Theoretical Physics |
| author_facet | Massachusetts Institute of Technology. Center for Theoretical Physics Aloni, Daniel Asadi, Pouya Nakai, Yuichiro Reece, Matthew Suzuki, Motoo |
| author_sort | Aloni, Daniel |
| collection | MIT |
| 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 | 2024-09-23T13:22:47Z |
| format | Article |
| id | mit-1721.1/136753 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T13:22:47Z |
| publishDate | 2021 |
| publisher | Springer Berlin Heidelberg |
| record_format | dspace |
| spelling | mit-1721.1/1367532023-08-10T21:01:22Z Spontaneous CP violation and horizontal symmetry in the MSSM: toward lepton flavor naturalness Aloni, Daniel Asadi, Pouya Nakai, Yuichiro Reece, Matthew Suzuki, Motoo Massachusetts Institute of Technology. Center for Theoretical Physics Massachusetts Institute of Technology. Department of Physics 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. 2021-10-29T18:45:53Z 2021-10-29T18:45:53Z 2021-09-06 2021-09-12T03:08:31Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/136753 Journal of High Energy Physics. 2021 Sep 06;2021(9):31 PUBLISHER_CC en https://doi.org/10.1007/JHEP09(2021)031 Creative Commons Attribution https://creativecommons.org/licenses/by/4.0/ The Author(s) application/pdf Springer Berlin Heidelberg Springer Berlin Heidelberg |
| spellingShingle | Aloni, Daniel Asadi, Pouya Nakai, Yuichiro Reece, Matthew Suzuki, Motoo Spontaneous CP violation and horizontal symmetry in the MSSM: toward lepton flavor naturalness |
| 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 |
| url | https://hdl.handle.net/1721.1/136753 |
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