Standard Model anomalies and vacuum stability for lepton portals with extra U(1) symmetry

被引：0

作者：

Branchina, Carlo ^{[1
,2
,3
]}

Lee, Hyun Min ^{[3
]}

Yamashita, Kimiko ^{[4
]}

机构：

[1] Univ Calabria, Dept Phys, I-87036 Cosenza, Italy

[2] INFN Cosenza, I-87036 Cosenza, Italy

[3] Chung Ang Univ, Dept Phys, Seoul 06974, South Korea

[4] Ibaraki Univ, Dept Phys, Mito, Ibaraki 3108512, Japan

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2025年 / 03期

基金：

新加坡国家研究基金会;

关键词：

Multi-Higgs Models; New Gauge Interactions; Renormalization Group; Vector-Like Fermions;

D O I：

10.1007/JHEP03(2025)122

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：

Recently, the experimental values of the muon (g - 2)(mu) and of the W boson mass m(W) have both indicated significant deviations from the SM predictions, motivating the exploration of extensions with extra particles and symmetries. We revisit a lepton portal model with U(1)(') gauge symmetry where an extra Higgs doublet, a scalar singlet and one SU(2)(L) singlet vector-like fermion are introduced. In this model, (g - 2)(mu) can be explained by extra one-loop contributions from the vector-like lepton and the Z(') boson, whereas m(W) can be increased by a tree-level mixing between the Z and Z'. Setting the Z(') and lepton couplings at low energies to account for the SM anomalies, we perform a Renormalization Group analysis to investigate on the high-energy behaviour of the model, in particular on the issue of vacuum stability. We find that in the alignment limit for the two Higgs doublets, the Landau pole and the scale where perturbativity is lost are of order 10 - 100 TeV, not far from the scales experimentally reached so far, and sensibly lower than the stability scale. We show how the Landau pole can be increased up to similar to 10(9) GeV in a misaligned scenario where the experimental anomalies are still accommodated and a positive shift of the Higgs quartic coupling to improve stability can be achieved.

引用

页数：38

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