自然F-SU(5)模型下的高能胶子质量与超对称粒子限制
5 浏览量
更新于2024-09-04
收藏 676KB PDF 举报
本文主要探讨了在自然无比例的重胶水理论框架下的一个特定超对称GUT模型——Flipped SU(5) (F-SU(5))。F-SU(5)模型是在LHC运行2的最新实验数据——80至137fb-1的结果基础上建立的，它在弦理论的约2×10^17GeV的尺度下运作，采用无尺度超重力边界条件，其中超对称性破坏的Bμ参数被严格设定为Bμ=0。这一设定避免了通常的电弱微调问题，使模型具有自然性。
模型中的关键参数是M1/2，它是决定粒子质量比例的重要参数。通过与实验观测到的125 GeV希格斯玻色子质量保持一致的约束，研究者们对模型进行了细致的分析。结果显示，允许的胶子质量M(g~)上限约为7.5 TeV，而最轻的超对称粒子(LSP)的质量M(χ~10)则限制在1.6 TeV以下。
为了解释宇宙学上的暗物质问题，文章引入了一个单个宇宙学主耦合λ6，用来稀释中性遗迹密度，使其符合WMAP和普朗克卫星实验的测量值。这表明在自然无比例的F-SU(5)模型中，不仅超对称粒子的质量受到严格的限制，而且其与宇宙学背景的连接也得到了考虑。
这篇研究深入分析了F-SU(5)模型在自然无比例理论中的应用，强调了粒子质量的限制以及如何通过宇宙学参数来解决暗物质问题，这对于理解超对称理论与实际观测之间的关系具有重要意义。
Physics Letters B 799 (2019) 135038
Contents lists available at ScienceDirect
Physics Letters B
www.elsevier.com/locate/physletb
The heavy gluino in natural no-scale F -SU(5)
Thomas Ford
a
, Tianjun Li
b,c
, James A. Maxin
a,∗
, Dimitri V. Nanopoulos
d,e,f
a
Department of Chemistry and Physics, Louisiana State University, Shreveport, LA 71115 USA
b
CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, PR China
c
School of Physical Sciences, University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, PR China
d
George P. and Cynthia W. Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University, College Station, TX 77843, USA
e
Astroparticle Physics Group, Houston Advanced Research Center (HARC), Mitchell Campus, Woodlands, TX 77381, USA
f
Academy of Athens, Division of Natural Sciences, 28 Panepistimiou Avenue, Athens 10679, Greece
a r t i c l e i n f o a b s t r a c t
Article history:
Received
20 August 2019
Accepted
16 October 2019
Available
online 22 October 2019
Editor:
M. Cveti
ˇ
c
In light of recent 80–137 fb
−1
results at the LHC Run 2 establishing a lower gluino mass limit of
2.25 TeV, we revisit the supersymmetric GUT model Flipped SU(5) with extra vector-like particles,
known as F -SU(5), with vanishing No-Scale Supergravity boundary conditions at the string scale of
about 2 × 10
17
GeV, including the supersymmetry breaking B
μ
parameter which is strictly enforced as
B
μ
= 0. Given the proportional dependence of all model scales on a single parameter M
1/2
, No-Scale
F -SU(5) was shown to possess no electroweak fine-tuning and thus persists as a natural one-parameter
model. In this fresh analysis here, we demand consistency with the measured 125 GeV light Higgs
boson mass, though we forgo an upper limit on the lightest neutralino relic density. The resulting
phenomenology delivers a gluino mass of M(
g) 7.5TeV and a lightest supersymmetric particle (LSP)
of M(
χ
0
1
) 1.6 TeV. In order to dilute the relic density down to the WMAP and Planck measurements,
we rely upon a single cosmological master coupling λ
6
.
© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license
(http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP
3
.
1. Introduction
The ATLAS and CMS Collaborations recently released the
80–137 fb
−1
results at the LHC Run 2 recorded from 2017–18,
highlighted by no significant deviation beyond the expected Stan-
dard
Model background [1]. The dearth of any positive signal of
supersymmetry (SUSY) has elevated the lower bound on the gluino
mass to 2.25 TeV with regards to the ATLAS and CMS
g →t
¯
t +
χ
0
1
simplified model scenarios [2,3]. The advancement of gluino limits
above 2TeV further strains the SUSY model space, providing impe-
tus
for phenomenologists to build SUSY models supporting a heavy
gluino, yet remain consistent with the measured light Higgs boson
mass of M
h
= 125.1 ± 0.14 GeV [4–6] and the WMAP 9-year [7]
plus
2018 Planck [8]observed relic density on the dark matter
content in our universe of
DM
h
2
0.12, in addition to satisfy-
ing
the world average top quark mass of M
t
= 173.1 ±0.9GeV[6].
In this current age of multi-TeV gluino exclusion limits, the inter-
section
of all these empirically validated quantities becomes ever
more increasingly difficult. Despite the aforementioned hurdles, we
shall present here an intriguing case for a natural SUSY model with
*
Corresponding author.
E-mail
address: james.maxin@lsus.edu (J.A. Maxin).
no electroweak fine-tuning that does indeed meet the experimen-
tal
requirements just noted and can also generate a heavy gluino
that would not as yet been produced at the LHC Run 2 in sufficient
quantities for detection.
The
SUSY Grand Unification Theory (GUT) model Flipped
SU(5) [9–11]with additional vector-like multiplets [12](referred
to as flippons [13]), better known as F-SU(5) [14,15], was shown
to possess no electroweak fine-tuning within the construct of
vanishing No-Scale Supergravity boundary conditions at the uni-
fication
scale [16]. The proportional dependence of all SUSY model
parameters as well as the electroweak scale Z-boson mass M
Z
and top quark mass M
t
upon a single unified model variable
M
1/2
established No-Scale F -SU(5) as a genuine one-parameter
model [17]. This overall rescaling at the leading order in terms
of the mass scale M
1/2
is analogous to the fixing of the Bohr
atomic radius in terms of the physical electron mass and charge, by
minimization of the electron energy [18]. In both these instances,
the spectrum scales corresponding to fluctuation in the selected
constants, whereas the relative internal structure of the model
is left intact. The single parameter nature of No-Scale F -SU(5)
was shown to lead to the rare and highly desirable attribute of
no electroweak fine-tuning and thus a rather natural SUSY GUT
model [16]. Moreover, No-Scale F -SU(5) was shown to be consis-
https://doi.org/10.1016/j.physletb.2019.135038
0370-2693/
© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by
SCOAP
3
.
下载后可阅读完整内容，剩余4页未读，立即下载
2021-09-08 上传
2021-09-07 上传
2021-09-08 上传
2021-08-30 上传
2021-08-19 上传
2021-09-15 上传
2021-09-10 上传
2021-05-19 上传
2021-10-07 上传
weixin_38623000
- 粉丝: 5
- 资源: 925
我的内容管理
展开
最新资源
- 平尾装配工作平台运输支撑系统设计与应用
- MAX-MIN Ant System：用MATLAB解决旅行商问题
- Flutter状态管理新秀：sealed_flutter_bloc包整合seal_unions
- Pong²开源游戏：双人对战图形化的经典竞技体验
- jQuery spriteAnimator插件：创建精灵动画的利器
- 广播媒体对象传输方法与设备的技术分析
- MATLAB HDF5数据提取工具：深层结构化数据处理
- 适用于arm64的Valgrind交叉编译包发布
- 基于canvas和Java后端的小程序“飞翔的小鸟”完整示例
- 全面升级STM32F7 Discovery LCD BSP驱动程序
- React Router v4 入门教程与示例代码解析
- 下载OpenCV各版本安装包，全面覆盖2.4至4.5
- 手写笔画分割技术的新突破：智能分割方法与装置
- 基于Koplowitz & Bruckstein算法的MATLAB周长估计方法
- Modbus4j-3.0.3版本免费下载指南
- PoqetPresenter：Sharp Zaurus上的开源OpenOffice演示查看器
