一般无尺度超引力下的F-SU(5)模型研究：LHC探测潜力

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本文主要探讨了一般无尺度超重力（General No-Scale Supergravity, GNS）框架下的一个特殊大统一模型——F-SU(5)理论。F-SU(5)是基于SU(5)的模型，它在标准模型的基础上试图实现大统一，并引入了额外的矢量样粒子多重态。不同于以往的研究，作者允许超对称性（Supersymmetry, SUSY）的软项不为零，这扩大了该模型在现象学上的可行性，特别是当SUSY破裂（SUSY breaking）的条件不再局限于通常的mSUGRA/CMSSM限制时。在当前的研究中，作者关注的是如何通过非零的SUSY破裂术语来拓宽矢量样粒子的质量范围，这些粒子可能包括轻至低于1 TeV的候选粒子，这对于大型强子对撞机（Large Hadron Collider, LHC2）的探测具有重要意义。这样，常规无标度F-SU(5)模型的参数空间变得更加实际，有可能在LHC2上被观测到。此外，本文还涉及到了暗物质的部分，如比诺（Bino）和希格斯诺（Higgsino），特别是讨论了希格斯漏斗区的可能性，这是一个在寻找暗物质过程中值得注意的区域。作者通过分析SUSY级联衰变产生的粒子状态，探索了不同现象学区域的特征，这对于区分理论预言与实验数据至关重要。这篇论文深入研究了GNS框架下的F-SU(5)模型，其焦点在于超对称性破裂对粒子质量范围的影响，以及它对LHC2实验结果预测的意义。作者的工作不仅丰富了对无标度超引力和大统一理论的理解，也为未来实验探测提供了新的理论指导。

Physics Letters B 771 (2017) 264–270

Contents lists available at ScienceDirect

Physics Letters B

www.elsevier.com/locate/physletb

General No-Scale Supergravity: An F -SU(5) tale

Dingli Hu

a,∗

, Tianjun Li

b,c

, Adam Lux

, James A. Maxin

d,e

, Dimitri V. Nanopoulos

a,f,g

George P. and Cynthia W. Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University, College Station, TX 77843, USA

Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China

School of Physical Sciences, University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China

Department of Physics and Engineering Physics, The University of Tulsa, Tulsa, OK 74104, USA

Department of Chemistry and Physics, Louisiana State University, Shreveport, LA 71115, USA

Astroparticle Physics Group, Houston Advanced Research Center (HARC), Mitchell Campus, Woodlands, TX 77381, USA

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

11 March 2017

Received

in revised form 16 May 2017

Accepted

17 May 2017

Available

online 24 May 2017

Editor: M.

Cveti

We study the grand uniﬁcation model ﬂipped SU(5) with additional vector-like particle multiplets,

or F -SU(5) for short, in the framework of General No-Scale Supergravity. In our analysis we allow

the supersymmetry (SUSY) breaking soft terms to be generically non-zero, thereby extending the

phenomenologically viable parameter space beyond the highly constrained one-parameter version of

F -SU(5). In this initial inquiry, the mSUGRA/CMSSM SUSY breaking terms are implemented. We ﬁnd

this easing away from the vanishing SUSY breaking terms enables a more broad mass range of vector-

particles, dubbed ﬂippons, including ﬂippons less than 1 TeV that could presently be observed

at the LHC2, as well as a lighter gluino mass and SUSY spectrum overall. This presents heightened

odds that the General No-Scale F -SU(5) viable parameter space can be probed at the LHC2. The

phenomenology comprises both bino and higgsino dark matter, including a Higgs funnel region. Particle

states emerging from the SUSY cascade decays are presented to experimentally distinguish amongst the

diverse phenomenological regions.

(http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP

1. Introduction

The second phase of the Large Hadron Collider (LHC) com-

menced

in 2015, seeking to append a discovery of supersymmetry

(SUSY) to the 2012 observation of the light CP-even Higgs boson.

The ATLAS experiment recorded 36.0fb

−1

of data in 2016 at a

13 TeV center-of-mass energy, while the CMS experiment recorded

37.82 fb

−1

. Given this rapid accumulation of luminosity in 2016

and soon to reenergize in 2017, the supersymmetric model space

is expected to be probed beyond a 2 TeV gluino (



g) mass. The most

recently published data statistics from the 2015 LHC1 run collision

data of 3.9fb

−1

recorded by ATLAS and 3.81 fb

−1

recorded by

CMS provide a lower search bound of about 1.9 TeV on the gluino

mass [1], serving as a rather strong constraint on the SUSY model

space.

The

beauty of supersymmetry lies in its capacity to naturally

resolve several fundamental dilemmas, such as stabilization of the

electroweak scale (EW), a lightest supersymmetric particle (LSP)

that is stable under R-parity serving as a natural dark matter

Corresponding author.

E-mail

address: hudingli@tamu.edu (D. Hu).

candidate, a radiative EW scale symmetry breaking mechanism,

and gauge coupling uniﬁcation. SUSY thus represents a promis-

ing

candidate for new physics beyond the Standard Model. The

SUSY search at the LHC though has returned null results thus far,

with no conclusive signals yet observed. Consequently, given an

experimentally measured Higgs boson mass of m

= 125.1GeV

[2,3],

a rather heavy light stop (



) mass, and hence SUSY spec-

trum

overall, is necessary in minimalistic models such as minimal

Supergravity (mSUGRA) and the Constrained Minimal Supersym-

metric

Standard Model (CMSSM) in order to generate the required

1-loop and 2-loop contributions to the Higgs boson mass due to

the large top Yukawa coupling. Accordingly, the experimentally vi-

able

SUSY spectra of mSUGRA/CMSSM, which are quite heavy, may

be beyond the reach of the LHC2.

The

GUT model ﬂipped SU(5) with additional vector-like multi-

plets,

or F -SU(5) for short, has been thoroughly examined in the

framework of No-Scale Supergravity (SUGRA) [4–8]. In these prior

analyses, the strict No-Scale SUGRA boundary conditions M

1/2

and

= A

= B

= 0were applied. Given these rigorous constraints

at the uniﬁcation scale, the vector-like particle (ﬂippon) mass scale

, top quark mass m

, and low energy ratio of Higgs vacuum ex-

pectation

values (VEVs) tanβ can be expressed as a function of the

http://dx.doi.org/10.1016/j.physletb.2017.05.056

0370-2693/

SCOAP

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