One-loop pseudoscalar mass in a 2HDM with a Z 3 symmetry
Abstract A two-Higgs doublet model with a discrete Z 3 symmetry acquires, in its scalar and gauge sectors, an accidental continuous U(1) symmetry. One therefore finds, after spontaneous symmetry breaking of those symmetries, that a massless pseudoscalar arises, as expected by Goldstone’s theorem. In...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2025-07-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP07(2025)264 |
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| author | P. M. Ferreira Tomás F. Pinto |
| author_facet | P. M. Ferreira Tomás F. Pinto |
| author_sort | P. M. Ferreira |
| collection | DOAJ |
| description | Abstract A two-Higgs doublet model with a discrete Z 3 symmetry acquires, in its scalar and gauge sectors, an accidental continuous U(1) symmetry. One therefore finds, after spontaneous symmetry breaking of those symmetries, that a massless pseudoscalar arises, as expected by Goldstone’s theorem. In the fermion sector, however, it is possible to obtain Yukawa matrix textures which distinguish between the Z 3 and U(1) symmetries, so one expects loop corrections to originate a non-zero pseudoscalar mass for the Z 3 case. We perform an explicit calculation that shows that at one-loop the pseudoscalar remains massless for all but one tested Z 3 Yukawa matrices. The pseudoscalar mass thus found is highly suppressed by the hierarchy of fermion masses. |
| format | Article |
| id | doaj-art-9ddd8ddebe364cb2b14ff761f7ad50a2 |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-9ddd8ddebe364cb2b14ff761f7ad50a22025-08-20T03:45:44ZengSpringerOpenJournal of High Energy Physics1029-84792025-07-012025713410.1007/JHEP07(2025)264One-loop pseudoscalar mass in a 2HDM with a Z 3 symmetryP. M. Ferreira0Tomás F. Pinto1Instituto Superior de Engenharia de Lisboa — ISELCentro de Física Teórica e Computacional, Faculdade de Ciências, Universidade de LisboaAbstract A two-Higgs doublet model with a discrete Z 3 symmetry acquires, in its scalar and gauge sectors, an accidental continuous U(1) symmetry. One therefore finds, after spontaneous symmetry breaking of those symmetries, that a massless pseudoscalar arises, as expected by Goldstone’s theorem. In the fermion sector, however, it is possible to obtain Yukawa matrix textures which distinguish between the Z 3 and U(1) symmetries, so one expects loop corrections to originate a non-zero pseudoscalar mass for the Z 3 case. We perform an explicit calculation that shows that at one-loop the pseudoscalar remains massless for all but one tested Z 3 Yukawa matrices. The pseudoscalar mass thus found is highly suppressed by the hierarchy of fermion masses.https://doi.org/10.1007/JHEP07(2025)264Multi-Higgs ModelsDiscrete SymmetriesGlobal Symmetries |
| spellingShingle | P. M. Ferreira Tomás F. Pinto One-loop pseudoscalar mass in a 2HDM with a Z 3 symmetry Journal of High Energy Physics Multi-Higgs Models Discrete Symmetries Global Symmetries |
| title | One-loop pseudoscalar mass in a 2HDM with a Z 3 symmetry |
| title_full | One-loop pseudoscalar mass in a 2HDM with a Z 3 symmetry |
| title_fullStr | One-loop pseudoscalar mass in a 2HDM with a Z 3 symmetry |
| title_full_unstemmed | One-loop pseudoscalar mass in a 2HDM with a Z 3 symmetry |
| title_short | One-loop pseudoscalar mass in a 2HDM with a Z 3 symmetry |
| title_sort | one loop pseudoscalar mass in a 2hdm with a z 3 symmetry |
| topic | Multi-Higgs Models Discrete Symmetries Global Symmetries |
| url | https://doi.org/10.1007/JHEP07(2025)264 |
| work_keys_str_mv | AT pmferreira onelooppseudoscalarmassina2hdmwithaz3symmetry AT tomasfpinto onelooppseudoscalarmassina2hdmwithaz3symmetry |