SEARCHING FOR LIGHT WEAKLY INTERACTING MASSIVE PARTICLES AT THE LARGE HADRON COLLIDER

2013 ◽  
Vol 23 ◽  
pp. 335-344
Author(s):  
S. SCOPEL
Keyword(s):  
Dark Matter ◽  
Large Hadron Collider ◽  
Galactic Halo ◽  
Hadron Collider ◽  
Weakly Interacting Massive Particles ◽  
Grand Unification ◽  
Supersymmetric Extension ◽  
Gaugino Mass ◽  
The Standard Model ◽  
Minimal Supersymmetric Extension

Light neutralinos implemented in an effective Minimal Supersymmetric extension of the Standard Model at the electroweak scale without requirement of a gaugino-mass unification at a grand unification scale may have a mass around 10 GeV, i.e. in the range of interest for present data of direct search for dark matter particles in the galactic halo. In this talk we discuss the challenges and prospects of searching for them at the Large Hadron Collider.

scholarly journals The dark phases of the N2HDM

2020 ◽  
Vol 2020 (8) ◽  
Author(s):  
Isabell Engeln ◽  
Pedro Ferreira ◽  
M. Margarete Mühlleitner ◽  
Rui Santos ◽  
Jonas Wittbrodt
Keyword(s):  
Dark Matter ◽  
Large Hadron Collider ◽  
Standard Model ◽  
Hadron Collider ◽  
Higgs Doublet ◽  
Tree Level ◽  
Vacuum Structure ◽  
The Standard Model ◽  
Doublet Model ◽  
Specific Phase

Abstract We discuss the dark phases of the Next-to-2-Higgs Doublet model. The model is an extension of the Standard Model with an extra doublet and an extra singlet that has four distinct CP-conserving phases, three of which provide dark matter candidates. We discuss in detail the vacuum structure of the different phases and the issue of stability at tree-level of each phase. Taking into account the most relevant experimental and theoretical constraints, we found that there are combinations of measurements at the Large Hadron Collider that could single out a specific phase. The measurement of h125 → γγ together with the discovery of a new scalar with specific rates to τ+τ− or γγ could exclude some phases and point to a specific phase.

scholarly journals Anomalous leptonic U(1) symmetry: Syndetic origin of the QCD axion, weak-scale dark matter, and radiative neutrino mass

2018 ◽  
Vol 33 (03) ◽  
pp. 1850024 ◽  
Author(s):  
Ernest Ma ◽  
Diego Restrepo ◽  
Óscar Zapata
Keyword(s):  
Dark Matter ◽  
Large Hadron Collider ◽  
Standard Model ◽  
Neutrino Mass ◽  
Hadron Collider ◽  
Neutrino Masses ◽  
Weak Scale ◽  
The Standard Model

The well-known leptonic U(1) symmetry of the Standard Model (SM) of quarks and leptons is extended to include a number of new fermions and scalars. The resulting theory has an invisible QCD axion (thereby solving the strong CP problem), a candidate for weak-scale dark matter (DM), as well as radiative neutrino masses. A possible key connection is a color-triplet scalar, which may be produced and detected at the Large Hadron Collider.

DIRECT VERSUS INDIRECT SEARCHES FOR NEUTRALINO DARK MATTER

1992 ◽  
Vol 07 (09) ◽  
pp. 733-747 ◽  
Author(s):  
A. BOTTINO ◽  
V. DE ALFARO ◽  
N. FORNENGO ◽  
A. MORALES ◽  
J. PUIMEDÓN ◽  
...  
Keyword(s):  
Experimental Data ◽  
Dark Matter ◽  
Standard Model ◽  
Coupling Strength ◽  
Supersymmetric Extension ◽  
Set Constraints ◽  
The Standard Model ◽  
Search Data ◽  
Relic Abundance ◽  
Minimal Supersymmetric Extension

Direct search for neutralino dark matter is analyzed in the framework of the minimal supersymmetric extension of the standard model, using a realistic evaluation of the neutralino relic abundance which also includes radiative corrections to the Higgs masses. Relevance of the present (Ge detectors) experimental data to set constraints on the parameters of the model is discussed and expectations for future experiments which involve neutralino-nucleus coherent processes are investigated. These results are compared to those obtained in a previous paper from indirect search data. In the present analysis particular attention is paid to the theoretical uncertainties due to the different estimates of the Higgs-nucleon coupling strength.

scholarly journals Gauge B–L model of radiative neutrino mass with multipartite dark matter

2016 ◽  
Vol 31 (27) ◽  
pp. 1650163 ◽  
Author(s):  
Ernest Ma ◽  
Nicholas Pollard ◽  
Oleg Popov ◽  
Mohammadreza Zakeri
Keyword(s):  
Dark Matter ◽  
Large Hadron Collider ◽  
Standard Model ◽  
Neutrino Mass ◽  
Hadron Collider ◽  
Anomaly Cancellation ◽  
Neutral Fermion ◽  
The Standard Model

We propose an extension of the Standard Model of quarks and leptons to include gauge B–L symmetry with an exotic array of neutral fermion singlets for anomaly cancellation. With the addition of suitable scalars also transforming under U(1)[Formula: see text], this becomes a model of radiative seesaw neutrino mass with possible multipartite dark matter. If leptoquark fermions are added, necessarily also transforming under U(1)[Formula: see text], the diphoton excess at 750 GeV, recently observed at the Large Hadron Collider, may also be explained.

scholarly journals Outstanding questions: physics beyond the Standard Model

2012 ◽  
Vol 370 (1961) ◽  
pp. 818-830 ◽  
Author(s):  
John Ellis
Keyword(s):  
Dark Matter ◽  
Higgs Boson ◽  
Large Hadron Collider ◽  
Standard Model ◽  
Particle Physics ◽  
Hadron Collider ◽  
Beyond The Standard Model ◽  
The Standard Model ◽  
The Difference ◽  
The Universe

The Standard Model of particle physics agrees very well with experiment, but many important questions remain unanswered, among them are the following. What is the origin of particle masses and are they due to a Higgs boson? How does one understand the number of species of matter particles and how do they mix? What is the origin of the difference between matter and antimatter, and is it related to the origin of the matter in the Universe? What is the nature of the astrophysical dark matter? How does one unify the fundamental interactions? How does one quantize gravity? In this article, I introduce these questions and discuss how they may be addressed by experiments at the Large Hadron Collider, with particular attention to the search for the Higgs boson and supersymmetry.

scholarly journals Collider Searches for Dark Matter through the Higgs Lens

Symmetry ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 2406
Author(s):  
Spyros Argyropoulos ◽  
Oleg Brandt ◽  
Ulrich Haisch
Keyword(s):  
Dark Matter ◽  
Large Hadron Collider ◽  
Symmetry Breaking ◽  
Particle Physics ◽  
Hadron Collider ◽  
Theoretical Models ◽  
Higgs Bosons ◽  
Astronomical Observations ◽  
The Standard Model ◽  
Breaking Mechanism

Despite the fact that dark matter constitutes one of the cornerstones of the standard cosmological paradigm, its existence has so far only been inferred from astronomical observations, and its microscopic nature remains elusive. Theoretical arguments suggest that dark matter might be connected to the symmetry-breaking mechanism of the electroweak interactions or of other symmetries extending the Standard Model of particle physics. The resulting Higgs bosons, including the 125 GeV spin-0 particle discovered recently at the Large Hadron Collider, therefore represent a unique tool to search for dark matter candidates at collider experiments. This article reviews some of the relevant theoretical models as well as the results from the searches for dark matter in signatures that involve a Higgs-like particle at the Large Hadron Collider.

scholarly journals DECLINE AND FALL OF THE STANDARD MODEL?

2002 ◽  
Vol 17 (23) ◽  
pp. 3284-3299 ◽  
Author(s):  
JOHN ELLIS
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Magnetic Moment ◽  
Anomalous Magnetic Moment ◽  
Cold Dark Matter ◽  
Beyond The Standard Model ◽  
Supersymmetric Extension ◽  
The Standard Model ◽  
Soft Supersymmetry Breaking ◽  
Minimal Supersymmetric Extension

Motivations for physics beyond the Standard Model are reviewed, with particular emphasis on supersymmetry at the TeV scale. Constraints on the minimal supersymmetric extension of the Standard Model with universal soft supersymmetry-breaking terms (CMSSM) are discussed. These are also combined with the supersymmetric interpretation of the anomalous magnetic moment of the muon. The prospects for observing supersymmetry at accelerators are reviewed using benchmark scenarios to focus the discussion. Prospects for other experiments including the detection of cold dark matter, μ → e γ and related processes, as well as proton decay are also discussed.

On probing Higgs couplings in H → Ze+e− and e+e−→ ZH

2016 ◽  
Vol 31 (04n05) ◽  
pp. 1650005 ◽  
Author(s):  
O. M. Boyarkin ◽  
G. G. Boyarkina
Keyword(s):  
Higgs Boson ◽  
Large Hadron Collider ◽  
Standard Model ◽  
Gauge Boson ◽  
Hadron Collider ◽  
Grand Unification ◽  
Symmetric Model ◽  
High Luminosity ◽  
The Standard Model ◽  
Effective Rank

Two most popular GUT scenarios, namely, the left–right symmetric model (LRM) and models coming from [Formula: see text] grand unification (effective rank 5 models (ER5M’s)) are considered. Both models forecast existence of the extra neutral gauge boson. Its contributions to the decay of the Higgs boson being an analog of the Standard Model (SM) Higgs boson [Formula: see text] and the process of the associated Higgs production with [Formula: see text] boson (Higgsstrahlung) [Formula: see text] are found. For both processes, deviations from the SM predicted by the LRM prove to be larger than that predicted by the ER5M’s. It is shown that in the case of the decay [Formula: see text] it is impossible to observe these deviations at the condition of the High Luminosity Large Hadron Collider. Investigation of the Higgsstrahlung disclosed that with its help one could make a choice between the SM and the SM extensions under consideration.

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