The scale-invariant NMSSM and the 126 GeV Higgs boson

被引：98

作者：

Gherghetta, Tony ^{[1
,2
]}

von Harling, Benedict ^{[1
,3
]}

Medina, Anibal D. ^{[1
]}

Schmidt, Michael A. ^{[1
]}

机构：

[1] Univ Melbourne, ARC Ctr Excellence Particle Phys Terascale, Sch Phys, Melbourne, Vic 3010, Australia

[2] Stanford Univ, Stanford Inst Theoret Phys, Stanford, CA 94305 USA

[3] SISSA, I-34136 Trieste, Italy

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2013年 / 02期

基金：

美国国家科学基金会; 澳大利亚研究理事会;

关键词：

Beyond Standard Model; Supersymmetric Standard Model; DARK-MATTER; SUPERSYMMETRY; PROGRAM; MASSES; MODEL;

D O I：

10.1007/JHEP02(2013)032

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：

The recent LHC discovery of a Higgs-like resonance at 126 GeV suggests that the minimal supersymmetric standard model must be modified in order to preserve naturalness. A simple extension is to include a singlet superfield and consider the scale-invariant NMSSM, whose renormalizable superpotential contains no dimensionful parameters. This extension not only solves the mu-problem, but can easily accommodate a 126 GeV Higgs. We study the naturalness of the scale-invariant NMSSM taking into account the recent constraints from LHC searches, flavor physics and electroweak precision tests. We show that TeV-scale stop masses are still allowed in much of the parameter space with 5% tuning for a low messenger scale of 20 TeV, split families (with third-generation sleptons decoupled) and Higgs-singlet coupling lambda of order one. For larger values of the Higgs-singlet coupling, which can relieve the tuning in the Higgs VEV, an additional tuning in the Higgs mass limits increasing the (lightest) stop mass beyond 1.2 TeV, the gluino mass above 3 TeV, and electroweak charginos and neutralinos beyond 400 GeV for a combined tuning better than 5%. This implies that the natural region of parameter space for the scale-invariant NMSSM will be fully explored at the 14 TeV LHC.

引用

页数：39

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