CP violation in a model with Higgs triplets
Abstract We discuss CP-violation in a model with a real and a complex isospin triplet Higgs fields without introducing any symmetries except for the electroweak gauge symmetry. This corresponds to the minimal extension of the Higgs sector with the following properties: (i) providing new source of CP...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2023-06-01
|
| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP06(2023)069 |
| _version_ | 1797675839836389376 |
|---|---|
| author | Ting-Kuo Chen Cheng-Wei Chiang Kei Yagyu |
| author_facet | Ting-Kuo Chen Cheng-Wei Chiang Kei Yagyu |
| author_sort | Ting-Kuo Chen |
| collection | DOAJ |
| description | Abstract We discuss CP-violation in a model with a real and a complex isospin triplet Higgs fields without introducing any symmetries except for the electroweak gauge symmetry. This corresponds to the minimal extension of the Higgs sector with the following properties: (i) providing new source of CP violation, (ii) absence of quark flavor changing neutral currents at tree level, and (iii) enabling the electroweak rho parameter to be unity at tree level in the scenario without imposing any new symmetries. Our model can be regarded as the generalized version of the Georgi-Machacek model, in which the global SU(2) L × SU(2) R symmetry is explicitly broken due to CP-violating terms in the potential. We present analytic formulas for theoretical constraints from perturbative unitarity and vacuum stability as well as contributions to the electron electric dipole moment (EDM) and the neutron EDM from all the Barr-Zee type diagrams. We then examine the parameter space allowed by the constraints mentioned above and also those from the uniqueness of the vacuum, measurements at Tevatron and LHC by using HEPfit to perform a global parameter fit. We find that the decays of the two lightest extra neutral (singly-charged) scalars, H 1 and H 2 H 1 ± $$ {H}_2\left({H}_1^{\pm}\right) $$ , into hZ (WZ) can be significant at the same time under the constraints, which can serve as direct evidence of CP violation in our model, but not from models with multi-doublet extensions. |
| first_indexed | 2024-03-11T22:20:31Z |
| format | Article |
| id | doaj.art-091f42ef55b7485e986cb5c0384163cd |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-03-11T22:20:31Z |
| publishDate | 2023-06-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-091f42ef55b7485e986cb5c0384163cd2023-09-24T11:06:06ZengSpringerOpenJournal of High Energy Physics1029-84792023-06-012023614510.1007/JHEP06(2023)069CP violation in a model with Higgs tripletsTing-Kuo Chen0Cheng-Wei Chiang1Kei Yagyu2Department of Physics and Center for Theoretical Physics, National Taiwan UniversityDepartment of Physics and Center for Theoretical Physics, National Taiwan UniversityDepartment of Physics, Osaka UniversityAbstract We discuss CP-violation in a model with a real and a complex isospin triplet Higgs fields without introducing any symmetries except for the electroweak gauge symmetry. This corresponds to the minimal extension of the Higgs sector with the following properties: (i) providing new source of CP violation, (ii) absence of quark flavor changing neutral currents at tree level, and (iii) enabling the electroweak rho parameter to be unity at tree level in the scenario without imposing any new symmetries. Our model can be regarded as the generalized version of the Georgi-Machacek model, in which the global SU(2) L × SU(2) R symmetry is explicitly broken due to CP-violating terms in the potential. We present analytic formulas for theoretical constraints from perturbative unitarity and vacuum stability as well as contributions to the electron electric dipole moment (EDM) and the neutron EDM from all the Barr-Zee type diagrams. We then examine the parameter space allowed by the constraints mentioned above and also those from the uniqueness of the vacuum, measurements at Tevatron and LHC by using HEPfit to perform a global parameter fit. We find that the decays of the two lightest extra neutral (singly-charged) scalars, H 1 and H 2 H 1 ± $$ {H}_2\left({H}_1^{\pm}\right) $$ , into hZ (WZ) can be significant at the same time under the constraints, which can serve as direct evidence of CP violation in our model, but not from models with multi-doublet extensions.https://doi.org/10.1007/JHEP06(2023)069CP ViolationMulti-Higgs Models |
| spellingShingle | Ting-Kuo Chen Cheng-Wei Chiang Kei Yagyu CP violation in a model with Higgs triplets Journal of High Energy Physics CP Violation Multi-Higgs Models |
| title | CP violation in a model with Higgs triplets |
| title_full | CP violation in a model with Higgs triplets |
| title_fullStr | CP violation in a model with Higgs triplets |
| title_full_unstemmed | CP violation in a model with Higgs triplets |
| title_short | CP violation in a model with Higgs triplets |
| title_sort | cp violation in a model with higgs triplets |
| topic | CP Violation Multi-Higgs Models |
| url | https://doi.org/10.1007/JHEP06(2023)069 |
| work_keys_str_mv | AT tingkuochen cpviolationinamodelwithhiggstriplets AT chengweichiang cpviolationinamodelwithhiggstriplets AT keiyagyu cpviolationinamodelwithhiggstriplets |