Solving the electron and muon $$g-2$$ g - 2 anomalies in $$Z'$$ Z ′ models

Abstract We consider simultaneous explanations of the electron and muon $$g-2$$ g - 2 anomalies through a single $$Z'$$ Z ′ of a $$U(1)'$$ U ( 1 ) ′ extension to the Standard Model (SM). We first perform a model-independent analysis of the viable flavour-dependent $$Z'$$ Z ′ couplings...

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Autores principales:	Arushi Bodas, Rupert Coy, Simon J. D. King
Formato:	article
Lenguaje:	EN
Publicado:	SpringerOpen 2021
Materias:	Astrophysics QB460-466 Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
Acceso en línea:	https://doaj.org/article/9f4519b4e336402bb93b019f1eee88a3
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spelling	oai:doaj.org-article:9f4519b4e336402bb93b019f1eee88a32021-12-05T12:09:05ZSolving the electron and muon $$g-2$$ g - 2 anomalies in $$Z'$$ Z ′ models10.1140/epjc/s10052-021-09850-x1434-60441434-6052https://doaj.org/article/9f4519b4e336402bb93b019f1eee88a32021-12-01T00:00:00Zhttps://doi.org/10.1140/epjc/s10052-021-09850-xhttps://doaj.org/toc/1434-6044https://doaj.org/toc/1434-6052Abstract We consider simultaneous explanations of the electron and muon $$g-2$$ g - 2 anomalies through a single $$Z'$$ Z ′ of a $$U(1)'$$ U ( 1 ) ′ extension to the Standard Model (SM). We first perform a model-independent analysis of the viable flavour-dependent $$Z'$$ Z ′ couplings to leptons, which are subject to various strict experimental constraints. We show that only a narrow region of parameter space with an MeV-scale $$Z'$$ Z ′ can account for the two anomalies. Following the conclusions of this analysis, we then explore the ability of different classes of $$Z'$$ Z ′ models to realise these couplings, including the SM $$+U(1)'$$ + U ( 1 ) ′ , the N-Higgs Doublet Model $$+U(1)'$$ + U ( 1 ) ′ , and a Froggatt–Nielsen style scenario. In each case, the necessary combination of couplings cannot be obtained, owing to additional relations between the $$Z'$$ Z ′ couplings to charged leptons and neutrinos induced by the gauge structure, and to the stringency of neutrino scattering bounds. Hence, we conclude that no $$U(1)'$$ U ( 1 ) ′ extension can resolve both anomalies unless other new fields are also introduced. While most of our study assumes the Caesium $$(g-2)_e$$ ( g - 2 ) e measurement, our findings in fact also hold in the case of the Rubidium measurement, despite the tension between the two.Arushi BodasRupert CoySimon J. D. KingSpringerOpenarticleAstrophysicsQB460-466Nuclear and particle physics. Atomic energy. RadioactivityQC770-798ENEuropean Physical Journal C: Particles and Fields, Vol 81, Iss 12, Pp 1-16 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Astrophysics QB460-466 Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
spellingShingle	Astrophysics QB460-466 Nuclear and particle physics. Atomic energy. Radioactivity QC770-798 Arushi Bodas Rupert Coy Simon J. D. King Solving the electron and muon $$g-2$$ g - 2 anomalies in $$Z'$$ Z ′ models
description	Abstract We consider simultaneous explanations of the electron and muon $$g-2$$ g - 2 anomalies through a single $$Z'$$ Z ′ of a $$U(1)'$$ U ( 1 ) ′ extension to the Standard Model (SM). We first perform a model-independent analysis of the viable flavour-dependent $$Z'$$ Z ′ couplings to leptons, which are subject to various strict experimental constraints. We show that only a narrow region of parameter space with an MeV-scale $$Z'$$ Z ′ can account for the two anomalies. Following the conclusions of this analysis, we then explore the ability of different classes of $$Z'$$ Z ′ models to realise these couplings, including the SM $$+U(1)'$$ + U ( 1 ) ′ , the N-Higgs Doublet Model $$+U(1)'$$ + U ( 1 ) ′ , and a Froggatt–Nielsen style scenario. In each case, the necessary combination of couplings cannot be obtained, owing to additional relations between the $$Z'$$ Z ′ couplings to charged leptons and neutrinos induced by the gauge structure, and to the stringency of neutrino scattering bounds. Hence, we conclude that no $$U(1)'$$ U ( 1 ) ′ extension can resolve both anomalies unless other new fields are also introduced. While most of our study assumes the Caesium $$(g-2)_e$$ ( g - 2 ) e measurement, our findings in fact also hold in the case of the Rubidium measurement, despite the tension between the two.
format	article
author	Arushi Bodas Rupert Coy Simon J. D. King
author_facet	Arushi Bodas Rupert Coy Simon J. D. King
author_sort	Arushi Bodas
title	Solving the electron and muon $$g-2$$ g - 2 anomalies in $$Z'$$ Z ′ models
title_short	Solving the electron and muon $$g-2$$ g - 2 anomalies in $$Z'$$ Z ′ models
title_full	Solving the electron and muon $$g-2$$ g - 2 anomalies in $$Z'$$ Z ′ models
title_fullStr	Solving the electron and muon $$g-2$$ g - 2 anomalies in $$Z'$$ Z ′ models
title_full_unstemmed	Solving the electron and muon $$g-2$$ g - 2 anomalies in $$Z'$$ Z ′ models
title_sort	solving the electron and muon $$g-2$$ g - 2 anomalies in $$z'$$ z ′ models
publisher	SpringerOpen
publishDate	2021
url	https://doaj.org/article/9f4519b4e336402bb93b019f1eee88a3
work_keys_str_mv	AT arushibodas solvingtheelectronandmuong2g2anomaliesinzzmodels AT rupertcoy solvingtheelectronandmuong2g2anomaliesinzzmodels AT simonjdking solvingtheelectronandmuong2g2anomaliesinzzmodels
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Solving the electron and muon $$g-2$$ g - 2 anomalies in $$Z'$$ Z ′ models

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