Large Higgs-electron Yukawa coupling in 2HDM
Abstract The present upper bound on κ e , the ratio between the electron Yukawa coupling and its Standard Model value, is of O600 $$ \mathcal{O}(600) $$. We ask what would be the implications in case that κ e is close to this upper bound. The simplest extension that allows for such enhancement is th...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2018-04-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1007/JHEP04(2018)044 |
| _version_ | 1818345857168179200 |
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| author | Avital Dery Claudia Frugiuele Yosef Nir |
| author_facet | Avital Dery Claudia Frugiuele Yosef Nir |
| author_sort | Avital Dery |
| collection | DOAJ |
| description | Abstract The present upper bound on κ e , the ratio between the electron Yukawa coupling and its Standard Model value, is of O600 $$ \mathcal{O}(600) $$. We ask what would be the implications in case that κ e is close to this upper bound. The simplest extension that allows for such enhancement is that of two Higgs doublet models (2HDM) without natural flavor conservation. In this framework, we find the following consequences: (i) Under certain conditions, measuring κ e and κ V would be enough to predict values of Yukawa couplings for other fermions and for the H and A scalars. (ii) In the case that the scalar potential has a softly broken Z 2 symmetry, the second Higgs doublet must be light, but if there is hard breaking of the symmetry, the second Higgs doublet can be much heavier than the electroweak scale and still allow the electron Yukawa coupling to be very different from its SM value. (iii) CP must not be violated at a level higher than O0.01/κe $$ \mathcal{O}\left(0.01/{\kappa}_e\right) $$ in both the scalar potential and the Yukawa sector. (iv) LHC searches for e + e − resonances constrain this scenario in a significant way. Finally, we study the implications for models where one of the scalar doublets couples only to the first generation, or only to the third generation. |
| first_indexed | 2024-12-13T17:09:02Z |
| format | Article |
| id | doaj.art-81c19abe22b04267be464cfa8c137733 |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-13T17:09:02Z |
| publishDate | 2018-04-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-81c19abe22b04267be464cfa8c1377332022-12-21T23:37:37ZengSpringerOpenJournal of High Energy Physics1029-84792018-04-012018412110.1007/JHEP04(2018)044Large Higgs-electron Yukawa coupling in 2HDMAvital Dery0Claudia Frugiuele1Yosef Nir2Department of Particle Physics and Astrophysics, Weizmann Institute of ScienceDepartment of Particle Physics and Astrophysics, Weizmann Institute of ScienceDepartment of Particle Physics and Astrophysics, Weizmann Institute of ScienceAbstract The present upper bound on κ e , the ratio between the electron Yukawa coupling and its Standard Model value, is of O600 $$ \mathcal{O}(600) $$. We ask what would be the implications in case that κ e is close to this upper bound. The simplest extension that allows for such enhancement is that of two Higgs doublet models (2HDM) without natural flavor conservation. In this framework, we find the following consequences: (i) Under certain conditions, measuring κ e and κ V would be enough to predict values of Yukawa couplings for other fermions and for the H and A scalars. (ii) In the case that the scalar potential has a softly broken Z 2 symmetry, the second Higgs doublet must be light, but if there is hard breaking of the symmetry, the second Higgs doublet can be much heavier than the electroweak scale and still allow the electron Yukawa coupling to be very different from its SM value. (iii) CP must not be violated at a level higher than O0.01/κe $$ \mathcal{O}\left(0.01/{\kappa}_e\right) $$ in both the scalar potential and the Yukawa sector. (iv) LHC searches for e + e − resonances constrain this scenario in a significant way. Finally, we study the implications for models where one of the scalar doublets couples only to the first generation, or only to the third generation.http://link.springer.com/article/10.1007/JHEP04(2018)044Beyond Standard ModelHiggs Physics |
| spellingShingle | Avital Dery Claudia Frugiuele Yosef Nir Large Higgs-electron Yukawa coupling in 2HDM Journal of High Energy Physics Beyond Standard Model Higgs Physics |
| title | Large Higgs-electron Yukawa coupling in 2HDM |
| title_full | Large Higgs-electron Yukawa coupling in 2HDM |
| title_fullStr | Large Higgs-electron Yukawa coupling in 2HDM |
| title_full_unstemmed | Large Higgs-electron Yukawa coupling in 2HDM |
| title_short | Large Higgs-electron Yukawa coupling in 2HDM |
| title_sort | large higgs electron yukawa coupling in 2hdm |
| topic | Beyond Standard Model Higgs Physics |
| url | http://link.springer.com/article/10.1007/JHEP04(2018)044 |
| work_keys_str_mv | AT avitaldery largehiggselectronyukawacouplingin2hdm AT claudiafrugiuele largehiggselectronyukawacouplingin2hdm AT yosefnir largehiggselectronyukawacouplingin2hdm |