Colorless top partners, a 125 GeV Higgs boson, and the limits on naturalness

被引：96

作者：

Burdman, Gustavo ^{[1
]}

Chacko, Zackaria ^{[2
]}

Harnik, Roni ^{[3
]}

de Lima, Leonardo ^{[4
]}

Verhaaren, Christopher B. ^{[2
]}

机构：

[1] Univ Sao Paulo, Inst Fis, BR-05508900 Sao Paulo, Brazil

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

[3] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[4] Univ Estadual Paulista, Inst Fis Teor, BR-01140070 Sao Paulo, Brazil

来源：

PHYSICAL REVIEW D | 2015年 / 91卷 / 05期

基金：

美国能源部; 美国国家科学基金会; 巴西圣保罗研究基金会;

关键词：

ELECTROWEAK SYMMETRY-BREAKING;

D O I：

10.1103/PhysRevD.91.055007

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Theories of physics beyond the standard model that address the hierarchy problem generally involve top partners, new particles that cancel the quadratic divergences associated with the Yukawa coupling of the Higgs boson to the top quark. With extensions of the standard model that involve new colored particles coming under strain from collider searches, scenarios in which the top partners carry no charge under the strong interactions have become increasingly compelling. Although elusive for direct searches, these theories predict modified couplings of the Higgs boson to the standard model particles. This results in corrections to the Higgs production and decay rates that can be detected at the LHC provided the top partners are sufficiently light, and the theory correspondingly natural. In this paper we consider three theories that address the little hierarchy problem and involve colorless top partners, specifically the mirror twin Higgs, folded supersymmetry, and the quirky little Higgs. For each model we investigate the current and future bounds on the top partners, and the corresponding limits on naturalness, that can be obtained from the Higgs program at the LHC. We conclude that the LHC will not be able to strongly disfavor naturalness, with mild tuning at the level of about one part in ten remaining allowed even with 3000 fb(-1) of data at 14 TeV.

引用

页数：15

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