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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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2025-07-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP07(2025)264 |
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| Summary: | 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. |
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| ISSN: | 1029-8479 |