Explaining the CDF-II W-boson mass anomaly in the Georgi-Machacek extension models

被引：11

作者：

Du, Xiao Kang ^{[1
,2
]}

Li, Zhuang ^{[1
]}

Wang, Fei ^{[1
]}

Zhang, Ying Kai ^{[1
]}

机构：

[1] Zhengzhou Univ, Sch Phys, Zhengzhou 450000, Peoples R China

[2] Henan Acad Sci, Inst Phys, Zhengzhou 450046, Peoples R China

来源：

EUROPEAN PHYSICAL JOURNAL C | 2023年 / 83卷 / 02期

基金：

中国国家自然科学基金;

关键词：

HIGGS-BOSON; RADIATIVE-CORRECTIONS; TRIPLETS; VIOLATION; TEVATRON; SECTORS; SEESAW;

D O I：

10.1140/epjc/s10052-023-11297-1

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：

Original Georgi-Machacek model can preserve the custodial symmetry at tree level after the electroweak symmetry breaking. Unless additional SU(2)(c )custodial symmetry breaking effects are significant, the new physics contributions to delta m(W) are always very small. Our numerical results show that ordinary GM model can contribute to delta m(W) a maximal amount 0.0012 GeV, which can not explain the new CDF-II anomaly on W boson mass. We propose firstly to introduce small misalignment among the triplet VEVs to increase delta m(W), which can give large new physics contributions to delta m(W). Such slightly misaligned triplet VEVs from custodial symmetry preserving scalar potential can still be allowed. Our numerical results indicate that the resulting delta m(W) can easily reach the 1 sigma range of CDF-II mW data and the splitting among the triplet VEVs A(v)(equivalent to v(xi) - v(chi)) can be as small as 0.8 GeV for v(chi) ? 15 GeV. We also propose to introduce an additional custodial symmetry breaking source by extending the GM model with a low scale RH neutrino sector, which can adopt the leptogenesis mechanism and allow moderately large coupling strength hijeven for triplet VEVs of order GeV. With low scale RH neutrino mass scale of order 10(2)-10(4) TeV, the new physics contribution to delta m(W) can reach 0.03 GeV and is much larger than that of ordinary GM model. Combining both custodial SU (2)(c) symmetry breaking effects, the small misalignment among the triplet VEVs and the moderately large h(ij) couplings allowed with RH neutrino sector, the value of delta m(W) can still easily reach the 1 sigma range of CDF-II m(W) data, with a minimum splitting (among the triplet VEVs) approximately 0.7 GeV for v(chi) ? 15 GeV.

引用

页数：13

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