Natural electroweak symmetry breaking from scale invariant Higgs mechanism

被引：128
作者：
Farzinnia, Arsham [1 ,2 ]
He, Hong-Jian [1 ,2 ,3 ,4 ]
Ren, Jing [1 ,2 ]
机构：
[1] Tsinghua Univ, Inst Modern Phys, Beijing 100084, Peoples R China
[2] Tsinghua Univ, Ctr High Energy Phys, Beijing 100084, Peoples R China
[3] Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China
[4] Chinese Acad Sci, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China
来源：
PHYSICS LETTERS B | 2013年 / 727卷 / 1-3期
关键词：
Scale symmetry; Radiative Higgs mechanism; Naturalness; LHC; Dark matter; WEAK-INTERACTIONS; HIGH-ENERGIES; UPPER-BOUNDS; BOSON; MASS; RENORMALIZATION; MODEL;
D O I：
10.1016/j.physletb.2013.09.060
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We construct a minimal viable extension of the standard model (SM) with classical scale symmetry. Its scalar sector contains a complex singlet in addition to the SM Higgs doublet. The scale-invariant and CP-symmetric Higgs potential generates radiative electroweak symmetry breaking a la Coleman-Weinberg, and gives a natural solution to the hierarchy problem, free from fine-tuning. Besides the 125 GeV SM-like Higgs particle, it predicts a new CP-even Higgs (serving as the pseudo-Nambu-Goldstone boson of scale symmetry breaking) and a CP-odd scalar singlet (providing the dark matter candidate) at weak scale. We systematically analyze experimental constraints from direct LHC Higgs searches and electroweak precision tests, as well as theoretical bounds from unitarity, triviality and vacuum stability. We demonstrate the viable parameter space, and discuss implications for new Higgs searches at the upcoming LHC runs and the on-going direct detections of dark matter. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码：141 / 150
页数：10
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