scholarly journals Hadronic production of light color-triplet Higgs bosons: An alternative signature for grand unified theories

2003 ◽  
Vol 67 (7) ◽  
Author(s):  
Kingman Cheung ◽  
Gi-Chol Cho
Keyword(s):  
Higgs Bosons ◽  
Grand Unified Theories ◽  
Unified Theories ◽  
Hadronic Production ◽  
Light Color

scholarly journals GRAND UNIFICATION WITHOUT HIGGS BOSONS

2012 ◽  
Vol 13 ◽  
pp. 20-27
Author(s):  
STEPHEN M. BARR ◽  
XAVIER CALMET
Keyword(s):  
Fixed Point ◽  
Weak Interactions ◽  
W Bosons ◽  
Gauge Coupling ◽  
Baryon Number ◽  
Higgs Bosons ◽  
Unified Theory ◽  
Grand Unified Theory ◽  
Grand Unified Theories ◽  
Unified Theories

We discuss how a model for the electroweak interactions without a Higgs could be embedded into a grand unified theory. The requirement of a non-trivial fixed point in the SU(2) sector of the weak interactions together with the requirement of the numerical unification of the gauge couplings leads to a prediction for the value of the SU(2) gauge coupling in the fixed point regime. The fixed point regime must be in the TeV region to solve the unitarity problem in the elastic scattering of W bosons. We find that the unification scale is at about 1014 GeV. Viable grand unified theories must thus conserve baryon number. We discuss how to build such a model without using Higgs bosons.

scholarly journals Probing unified theories with reduced couplings at future hadron colliders

2021 ◽  
Vol 81 (2) ◽  
Author(s):  
S. Heinemeyer ◽  
J. Kalinowski ◽  
W. Kotlarski ◽  
M. Mondragón ◽  
G. Patellis ◽  
...  
Keyword(s):  
Perturbation Theory ◽  
Renormalization Group ◽  
Standard Model ◽  
Higgs Bosons ◽  
Hadron Colliders ◽  
Group Invariant ◽  
Grand Unified Theories ◽  
Unified Theories ◽  
Discovery Potential ◽  
Successful Reduction

AbstractThe search for renormalization group invariant relations among parameters to all orders in perturbation theory constitutes the basis of the reduction of couplings concept. Reduction of couplings can be achieved in certain $$N=1$$ N = 1 supersymmetric grand unified theories and few of them can become even finite at all loops. We review the basic idea, the tools that have been developed as well as the resulting theories in which successful reduction of couplings has been achieved so far. These include: (i) a reduced version of the minimal $$N = 1\ SU(5)$$ N = 1 S U ( 5 ) model, (ii) an all-loop finite $$N = 1\ SU(5)$$ N = 1 S U ( 5 ) model, (iii) a two-loop finite $$N = 1\ SU(3)^3$$ N = 1 S U ( 3 ) 3 model and finally (vi) a reduced version of the Minimal Supersymmetric Standard Model. In this paper we present a number of benchmark scenarios for each model and investigate their observability at existing and future hadron colliders. The heavy supersymmetric spectra featured by each of the above models are found to be beyond the reach of the 14 TeV HL-LHC. It is also found that the reduced version of the MSSM is already ruled out by the LHC searches for heavy neutral MSSM Higgs bosons. In turn the discovery potential of the 100 TeV FCC-hh is investigated and found that large parts of the predicted spectrum of these models can be tested, but the higher mass regions are beyond the reach even of the FCC-hh.

scholarly journals Probing degenerate heavy Higgs bosons in NMSSM with vector-like particles

2017 ◽  
Vol 32 (33) ◽  
pp. 1745005
Author(s):  
Fei Wang ◽  
Wenyu Wang ◽  
Lei Wu ◽  
Jin Min Yang ◽  
Mengchao Zhang
Keyword(s):  
Dark Matter ◽  
Large Hadron Collider ◽  
Standard Model ◽  
Hadron Collider ◽  
Higgs Bosons ◽  
High Mass ◽  
Top Down ◽  
Null Results ◽  
Grand Unified Theories ◽  
Unified Theories

In this work, we investigate the degenerate heavy Higgs bosons in the Next-to-Minimal Supersymmetric Standard Model (NMSSM) by introducing vector-like particles. Such an extension is well motivated from the top-down view since some grand unified theories usually predict the existence of singlet scalars and vector-like particles at weak scale. Under the constraints from the Large Hadron Collider (LHC) and dark matter experiments, we find that (1) the null results of searching for high mass resonances have tightly constrained the parameter space; (2) two degenerate heavy singlet Higgs bosons [Formula: see text] and [Formula: see text] can sizably decay to [Formula: see text] invisibly. Therefore, search for the monojet events through the process [Formula: see text] may further test our scenario at the future LHC.

Water, Water, Here and There

2018 ◽  
Author(s):  
Steven E. Vigdor
Keyword(s):  
Quark Mass ◽  
Mass Difference ◽  
Baryon Number ◽  
Electroweak Phase Transition ◽  
Hydrogen Burning ◽  
Quark Masses ◽  
Grand Unified Theories ◽  
Down Quark ◽  
Unified Theories ◽  
The Stability

Chapter 4 deals with the stability of the proton, hence of hydrogen, and how to reconcile that stability with the baryon number nonconservation (or baryon conservation) needed to establish a matter–antimatter imbalance in the infant universe. Sakharov’s three conditions for establishing a matter–antimatter imbalance are presented. Grand unified theories and experimental searches for proton decay are described. The concept of spontaneous symmetry breaking is introduced in describing the electroweak phase transition in the infant universe. That transition is treated as the potential site for introducing the imbalance between quarks and antiquarks, via either baryogenesis or leptogenesis models. The up–down quark mass difference is presented as essential for providing the stability of hydrogen and of the deuteron, which serves as a crucial stepping stone in stellar hydrogen-burning reactions that generate the energy and elements needed for life. Constraints on quark masses from lattice QCD calculations and violations of chiral symmetry are discussed.

scholarly journals Accidental SO(10) axion from gauged flavour

2020 ◽  
Vol 2020 (11) ◽  
Author(s):  
Luca Di Luzio
Keyword(s):  
Mass Window ◽  
High Quality ◽  
High Scale ◽  
Quality Problem ◽  
Axion Mass ◽  
Grand Unified Theories ◽  
Unified Theories ◽  
Canonical Dimension ◽  
General Perspective ◽  
Effective Operators

Abstract An accidental U(1) Peccei-Quinn (PQ) symmetry automatically arises in a class of SO(10) unified theories upon gauging the SU(3)f flavour group. The PQ symmetry is protected by the ℤ4 × ℤ3 center of SO(10) × SU(3)f up to effective operators of canonical dimension six. However, high-scale contributions to the axion potential posing a PQ quality problem arise only at d = 9. In the pre-inflationary PQ breaking scenario the axion mass window is predicted to be ma ∈ [7 × 10−8, 10−3] eV, where the lower end is bounded by the seesaw scale and the upper end by iso-curvature fluctuations. A high-quality axion, that is immune to the PQ quality problem, is obtained for ma ≳ 2 0.02 eV. We finally offer a general perspective on the PQ quality problem in grand unified theories.

Mass scales in grand unified theories

1982 ◽  
Vol 26 (9) ◽  
pp. 2396-2419 ◽  
Author(s):  
R. W. Robinett ◽  
Jonathan L. Rosner
Keyword(s):  
Grand Unified Theories ◽  
Unified Theories
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