A bridge to new physics: proposing new — and reviving old — explanations of a μ
Abstract The 4.2 σ tension in the combined measurement of the anomalous magnetic moment of the muon, a μ , and the Standard Model prediction strongly suggests the existence of beyond the Standard Model physics. Following the Standard Model Effective Field Theory approach, we study a particular topol...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2022-09-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP09(2022)181 |
| _version_ | 1811258898465685504 |
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| author | Guilherme Guedes Pablo Olgoso |
| author_facet | Guilherme Guedes Pablo Olgoso |
| author_sort | Guilherme Guedes |
| collection | DOAJ |
| description | Abstract The 4.2 σ tension in the combined measurement of the anomalous magnetic moment of the muon, a μ , and the Standard Model prediction strongly suggests the existence of beyond the Standard Model physics. Following the Standard Model Effective Field Theory approach, we study a particular topology, the bridge diagram, which gives a chirally enhanced contribution to a μ . We classify all possible 2- and 3-field SM extensions that can generate this contribution and present the full a μ result for them. Within our approach, we find that several 2-field fermion-scalar extensions which had been previously discarded in the literature — when only the Yukawa-suppressed contribution was considered — can actually be viable models to explain the observed anomaly. Furthermore, the 3-field extensions which generate the bridge diagram represent a new class of models to account for a μ . We explore a particular 3-field extension which, beyond explaining a μ , can also account for the neutral B-meson anomalies and the Cabibbo angle anomaly. We present the full one-loop matching for this model and a one-loop phenomenological study. |
| first_indexed | 2024-04-12T18:21:31Z |
| format | Article |
| id | doaj.art-39682b1529a04171bcce9245d8f1bbcd |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-04-12T18:21:31Z |
| publishDate | 2022-09-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-39682b1529a04171bcce9245d8f1bbcd2022-12-22T03:21:25ZengSpringerOpenJournal of High Energy Physics1029-84792022-09-012022913210.1007/JHEP09(2022)181A bridge to new physics: proposing new — and reviving old — explanations of a μGuilherme Guedes0Pablo Olgoso1CAFPE and Departamento de Física Teórica y del Cosmos, Universidad de GranadaCAFPE and Departamento de Física Teórica y del Cosmos, Universidad de GranadaAbstract The 4.2 σ tension in the combined measurement of the anomalous magnetic moment of the muon, a μ , and the Standard Model prediction strongly suggests the existence of beyond the Standard Model physics. Following the Standard Model Effective Field Theory approach, we study a particular topology, the bridge diagram, which gives a chirally enhanced contribution to a μ . We classify all possible 2- and 3-field SM extensions that can generate this contribution and present the full a μ result for them. Within our approach, we find that several 2-field fermion-scalar extensions which had been previously discarded in the literature — when only the Yukawa-suppressed contribution was considered — can actually be viable models to explain the observed anomaly. Furthermore, the 3-field extensions which generate the bridge diagram represent a new class of models to account for a μ . We explore a particular 3-field extension which, beyond explaining a μ , can also account for the neutral B-meson anomalies and the Cabibbo angle anomaly. We present the full one-loop matching for this model and a one-loop phenomenological study.https://doi.org/10.1007/JHEP09(2022)181SMEFTSpecific BSM PhenomenologyVector-Like FermionsSemi-Leptonic Decays |
| spellingShingle | Guilherme Guedes Pablo Olgoso A bridge to new physics: proposing new — and reviving old — explanations of a μ Journal of High Energy Physics SMEFT Specific BSM Phenomenology Vector-Like Fermions Semi-Leptonic Decays |
| title | A bridge to new physics: proposing new — and reviving old — explanations of a μ |
| title_full | A bridge to new physics: proposing new — and reviving old — explanations of a μ |
| title_fullStr | A bridge to new physics: proposing new — and reviving old — explanations of a μ |
| title_full_unstemmed | A bridge to new physics: proposing new — and reviving old — explanations of a μ |
| title_short | A bridge to new physics: proposing new — and reviving old — explanations of a μ |
| title_sort | bridge to new physics proposing new and reviving old explanations of a μ |
| topic | SMEFT Specific BSM Phenomenology Vector-Like Fermions Semi-Leptonic Decays |
| url | https://doi.org/10.1007/JHEP09(2022)181 |
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