EFTs meet Higgs nonlinearity, compositeness and (neutral) naturalness

被引：14

作者：

Li, Hao-Lin ^{[1
]}

Xu, Ling-Xiao ^{[2
,3
]}

Yu, Jiang-Hao ^{[1
,4
]}

Zhu, Shou-hua ^{[2
,3
,5
,6
]}

机构：

[1] Chinese Acad Sci, CAS Key Lab Theoret Phys, Inst Theoret Phys, Beijing 100190, Peoples R China

[2] Peking Univ, Dept Phys, Beijing 100871, Peoples R China

[3] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China

[4] Univ Chinese Acad Sci, Sch Phys Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China

[5] Collaborat Innovat Ctr Quantum Matter, Beijing, Peoples R China

[6] Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2019年 / 2019卷 / 09期

基金：

美国国家科学基金会;

关键词：

Beyond Standard Model; Effective Field Theories; Higgs Physics; Technicolor and Composite Models; ELECTROWEAK SYMMETRY-BREAKING; BOSON PRODUCTION; FLAVOR; NAMBU; MODEL;

D O I：

10.1007/JHEP09(2019)010

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：

Composite Higgs and neutral-naturalness models are popular scenarios in which the Higgs boson is a pseudo Nambu-Goldstone boson (PNGB), and naturalness problem is addressed by composite top partners. Since the standard model effective field theory (SMEFT) with dimension-six operators cannot fully retain the information of Higgs nonlinearity due to its PNGB nature, we systematically construct low energy Lagrangian in which the information of compositeness and Higgs nonlinearity are encoded in the form factors, the two-point functions in the top sector. We classify naturalness conditions in various scenarios, and first present these form factors in composite neutral naturalness models. After extracting out Higgs effective couplings from these form factors and performing the global fit, we find the value of Higgs top coupling could still be larger than the standard model one if the top quark is embedded in the higher dimensional representations. Also we find the impact of Higgs nonlinearity is enhanced by the large mass splitting between composite states. In this case, pattern of the correlation between the tt<overbar></mml:mover>h and t<mml:mover accent="true">t<mml:mo stretchy="true"><overbar></mml:mover>hh couplings is quite different for the linear and nonlinear Higgs descriptions.

引用

页数：40

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