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

被引：0

作者：

Bodas, Arushi ^{[1
]}

Coy, Rupert ^{[2
]}

King, Simon J. D. ^{[3
]}

机构：

[1] Univ Maryland, Maryland Ctr Fundamental Phys, College Pk, MD 20742 USA

[2] Univ Libre Bruxelles, Serv Phys Theor, Blvd Triomphe,CP225, B-1050 Brussels, Belgium

[3] Univ Southampton, Sch Phys & Astron, Southampton SO17 1BJ, Hants, England

来源：

EUROPEAN PHYSICAL JOURNAL C | 2021年 / 81卷 / 12期

关键词：

NEUTRINO MASS; PHYSICS; SEARCH; GAMMA; EVENTS; BOSON;

D O I：

10.1140/epjc/s10052-021-09850-x

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We consider simultaneous explanations of the electron and muon g - 2 anomalies through a single Z' of a U(1)' extension to the Standard Model (SM). We first perform a model-independent analysis of the viable flavour-dependent 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' can account for the two anomalies. Following the conclusions of this analysis, we then explore the ability of different classes of Z' models to realise these couplings, including the SM+U(1)', the N-Higgs Doublet Model+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' 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)' extension can resolve both anomalies unless other new fields are also introduced. While most of our study assumes the Caesium (g - 2)(e) measurement, our findings in fact also hold in the case of the Rubidium measurement, despite the tension between the two.

引用

页数：16

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