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Dr. Tianjun Li

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Guest Editor

1. CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China
2. School of Physical Sciences, University of Chinese Academy of Sciences, No.19A Yuquan Road, Beijing 100049, China
Interests: accelerator physics; particle physics; supersymmetry; grand unified theory; superstring phenomenology; cosmology

Prof. Dr. Jun-Jie Cao

E-Mail Website
Guest Editor

Department of Physics, Henan Normal University, Xinxiang 453007, China
Interests: electroweak symmetry breaking; dark matter; asymmetry of matter and antimatter
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In the Standard Model (SM) of particle physics, we break the electroweak symmetry and generate the masses of elementary particles via a Higgs field, which was discovered at the LHC. Although the SM is phenomenologically successful, it still suffers from the fine-tuning problem in stabilizing the electroweak symmetry-breaking scale. Thus, researchers usually regard it as an incomplete theory. Fortunately, this problem can be solved by imposing so-called supersymmetry on the theory. Supersymmetry is a symmetry between fermions and bosons, and it implies that every SM particle must have its supersymmetric partner with a spin difference of 1/2. This partner can cancel out the SM particle’s quantum contribution to the Higgs potential and thus stabilize the electroweak symmetry-breaking scale.

Supersymmetry theory predicts more than one SU(2)-doublet Higgs field in nature to break the electroweak symmetry. Their supersymmetric partners can also significantly affect Higgs potential by radiation corrections. These characteristics make the Higgs physics of the theory quite different from those of the SM. Higgs particle studies are helpful in identifying the correct electroweak symmetry-breaking mechanism and extracting useful information about supersymmetry. This Special Issue will focus on the Higgs phenomenology in both the Minimal Supersymmetric Standard Model and its various extensions, including theoretical predictions and experimental limitations of Higgs properties, and the detection of Higgs signals on different colliders. It also includes research on vacuum stability, electroweak first-order phase transition, and related issues, such as gravitational waves and baryogenesis. In addition, since Higgs physics interwinds dark matter physics and particle physics, the applications of Higgs bosons in dark matter and particle physics are also the subjects of this Special Issue.

Dr. Tianjun Li
Prof. Dr. Jun-Jie Cao
Guest Editors

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Keywords

Supersymmetry
Higgs phenomenology
Dark matter physics
particle physics
Vacuum stability
Phase transition
Gravitational waves
Baryogenesis

Published Papers (3 papers)

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Research

12 pages, 502 KiB

Open AccessFeature PaperArticle

Gaugino Masses from Misaligned Supersymmetry Breaking and R-Symmetry Breaking Spurions

by Yunhao Fu, Tianjun Li, Longjie Ran and Zheng Sun

Symmetry 2023, 15(3), 566; https://doi.org/10.3390/sym15030566 - 21 Feb 2023

Cited by 1 | Viewed by 940

Abstract

In gauge mediation models with multiple spurion fields breaking SUSY and the R-symmetry separately, we show that it is possible to generate gaugino masses in one loop if the R-charge arrangement satisfies a certain condition. The resulting gaugino masses are calculated and suppressed by a power of the messenger’s mass scale. We present two simple examples to demonstrate this possibility and discuss possible phenomenology implications. Full article

(This article belongs to the Special Issue Supersymmetry with Higgs Bosons Research)

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22 pages, 1233 KiB

Open AccessFeature PaperEditor’s ChoiceArticle

Detecting Heavy Neutral SUSY Higgs Bosons Decaying to Sparticles at the High-Luminosity LHC

by Howard Baer, Vernon Barger, Xerxes Tata and Kairui Zhang

Symmetry 2023, 15(2), 548; https://doi.org/10.3390/sym15020548 - 18 Feb 2023

Cited by 6 | Viewed by 1242

Abstract

In supersymmetry (SUSY) models with low electroweak naturalness (natSUSY), which have been suggested to be the most likely version of SUSY to emerge from the string landscape, higgsinos are expected at the few hundred GeV scale, whilst electroweak gauginos inhabit the TeV scale. [...] Read more.

H, A

are gaugino plus higgsino provided these decays are kinematically open. The light higgsinos decay to soft particles, so are largely invisible, whilst the gauginos decay to W, Z or h plus missing transverse energy (

\frac{E}{T}

). Thus, we examine the viability of

H, A \to W + \frac{E}{T}

Z + \frac{E}{T}

and

h + \frac{E}{T}

signatures at the high luminosity LHC (HL-LHC) in light of large standard model (SM) backgrounds from (mainly)

t \bar{t}

V V

and

V h

production (where

V = W, Z

). We also examine whether these signal channels can be enhanced over backgrounds by requiring the presence of an additional soft lepton from the decays of the light higgsinos. We find significant regions in the vicinity of

m_{A} \sim 1 - 2

TeV of the

m_{A}

vs.

tan β

plane, which can be probed at the high luminosity LHC, using these dominant signatures by HL-LHC at

5 σ

and at the 95% confidence level (CL). Full article

(This article belongs to the Special Issue Supersymmetry with Higgs Bosons Research)

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15 pages, 925 KiB

Open AccessFeature PaperArticle

A Study of the Higgs Mass with the Effective Potential and Higgs Decays in the U(1)_XSSM

by Shu-Min Zhao, Xi Wang, Xing-Xing Dong, Hai-Bin Zhang and Tai-Fu Feng

Symmetry 2022, 14(10), 2153; https://doi.org/10.3390/sym14102153 - 14 Oct 2022

Viewed by 1040

Abstract

As the U(1) extension of the minimal supersymmetric standard model, the

U {(1)}_{X}

SSM has new superfields, such as right-handed neutrinos, and three Higgs singlets. In the

U {(1)}_{X}

SSM, the lightest CP-even Higgs mass [...] Read more.

As the U(1) extension of the minimal supersymmetric standard model, the

U {(1)}_{X}

SSM has new superfields, such as right-handed neutrinos, and three Higgs singlets. In the

U {(1)}_{X}

SSM, the lightest CP-even Higgs mass

m_{h^{0}}

is studied by using the Higgs effective potential with one-loop corrections. We also calculate the Higgs decays

h^{0} \to γ γ

h^{0} \to V V (V = W, Z)

h^{0} \to l \bar{l} Z

, and

h^{0} \to ν \bar{ν} Z

. The obtained results are reasonable, and they are in favor of the study of the Higgs characteristic and the phenomenology of the

U {(1)}_{X}

SSM. Full article

(This article belongs to the Special Issue Supersymmetry with Higgs Bosons Research)

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