Two-loop analysis of classically scale-invariant models with extended Higgs sectors
Abstract We present the first explicit calculation of leading two-loop corrections to the Higgs trilinear coupling λ hhh in models with classical scale invariance (CSI), using the effective-potential approximation. Furthermore, we also study — for the first time at two loops — the relation that appe...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2021-03-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP03(2021)297 |
| _version_ | 1819071432255078400 |
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| author | Johannes Braathen Shinya Kanemura Makoto Shimoda |
| author_facet | Johannes Braathen Shinya Kanemura Makoto Shimoda |
| author_sort | Johannes Braathen |
| collection | DOAJ |
| description | Abstract We present the first explicit calculation of leading two-loop corrections to the Higgs trilinear coupling λ hhh in models with classical scale invariance (CSI), using the effective-potential approximation. Furthermore, we also study — for the first time at two loops — the relation that appears between the masses of all states in CSI theories, due to the requirement of reproducing correctly the 125-GeV Higgs-boson mass. In addition to obtaining analytic results for general CSI models, we consider two particular examples of Beyond-the-Standard-Model theories with extended Higgs sectors, namely an N-scalar model (endowed with a global O(N) symmetry) and a CSI version of the Two-Higgs-Doublet Model, and we perform detailed numerical studies of these scenarios. While at one loop the value of the Higgs trilinear coupling is identical in all CSI models, and deviates by approximately 82% from the (one-loop) SM prediction, we find that the inclusion of two- loop corrections lifts this universality and allows distinguishing different BSM scenarios with CSI. Taking into account constraints from perturbative unitarity and the relation among masses, we find for both types of scenarios we consider that at two loops λ hhh deviates from its SM prediction by 100 ± 10% — i.e. a quite significant further deviation with respect to the one-loop result of ∼ 82%. |
| first_indexed | 2024-12-21T17:21:44Z |
| format | Article |
| id | doaj.art-b0c83ddb5b9243afba7c7f96c16033de |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-21T17:21:44Z |
| publishDate | 2021-03-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-b0c83ddb5b9243afba7c7f96c16033de2022-12-21T18:56:08ZengSpringerOpenJournal of High Energy Physics1029-84792021-03-012021315810.1007/JHEP03(2021)297Two-loop analysis of classically scale-invariant models with extended Higgs sectorsJohannes Braathen0Shinya Kanemura1Makoto Shimoda2Department of Physics, Osaka UniversityDepartment of Physics, Osaka UniversityDepartment of Physics, Osaka UniversityAbstract We present the first explicit calculation of leading two-loop corrections to the Higgs trilinear coupling λ hhh in models with classical scale invariance (CSI), using the effective-potential approximation. Furthermore, we also study — for the first time at two loops — the relation that appears between the masses of all states in CSI theories, due to the requirement of reproducing correctly the 125-GeV Higgs-boson mass. In addition to obtaining analytic results for general CSI models, we consider two particular examples of Beyond-the-Standard-Model theories with extended Higgs sectors, namely an N-scalar model (endowed with a global O(N) symmetry) and a CSI version of the Two-Higgs-Doublet Model, and we perform detailed numerical studies of these scenarios. While at one loop the value of the Higgs trilinear coupling is identical in all CSI models, and deviates by approximately 82% from the (one-loop) SM prediction, we find that the inclusion of two- loop corrections lifts this universality and allows distinguishing different BSM scenarios with CSI. Taking into account constraints from perturbative unitarity and the relation among masses, we find for both types of scenarios we consider that at two loops λ hhh deviates from its SM prediction by 100 ± 10% — i.e. a quite significant further deviation with respect to the one-loop result of ∼ 82%.https://doi.org/10.1007/JHEP03(2021)297Beyond Standard ModelHiggs Physics |
| spellingShingle | Johannes Braathen Shinya Kanemura Makoto Shimoda Two-loop analysis of classically scale-invariant models with extended Higgs sectors Journal of High Energy Physics Beyond Standard Model Higgs Physics |
| title | Two-loop analysis of classically scale-invariant models with extended Higgs sectors |
| title_full | Two-loop analysis of classically scale-invariant models with extended Higgs sectors |
| title_fullStr | Two-loop analysis of classically scale-invariant models with extended Higgs sectors |
| title_full_unstemmed | Two-loop analysis of classically scale-invariant models with extended Higgs sectors |
| title_short | Two-loop analysis of classically scale-invariant models with extended Higgs sectors |
| title_sort | two loop analysis of classically scale invariant models with extended higgs sectors |
| topic | Beyond Standard Model Higgs Physics |
| url | https://doi.org/10.1007/JHEP03(2021)297 |
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