scholarly journals Minimal model for the fermion flavor structure, mass hierarchy, dark matter, leptogenesis, and the electron and muon anomalous magnetic moments

2020 ◽  
Vol 102 (5) ◽  
Author(s):  
A. E. Cárcamo Hernández ◽  
D. T. Huong ◽  
H. N. Long
Keyword(s):  
Dark Matter ◽  
Minimal Model ◽  
Magnetic Moments ◽  
Mass Hierarchy ◽  
Flavor Structure

scholarly journals A multi-component SIMP model with U(1)X → Z2 × Z3

2021 ◽  
Vol 2021 (9) ◽  
Author(s):  
Soo-Min Choi ◽  
Jinsu Kim ◽  
Pyungwon Ko ◽  
Jinmian Li
Keyword(s):  
Dark Matter ◽  
Gauge Symmetry ◽  
Mass Difference ◽  
Massive Particle ◽  
Large Mass ◽  
Small Mass ◽  
Dark Matter Candidate ◽  
Mass Hierarchy ◽  
New Class ◽  
Matter Fields

Abstract Multi-component dark matter scenarios are studied in the model with U(1)X dark gauge symmetry that is broken into its product subgroup Z2 × Z3 á la Krauss-Wilczek mechanism. In this setup, there exist two types of dark matter fields, X and Y, distinguished by different Z2 × Z3 charges. The real and imaginary parts of the Z2-charged field, XR and XI, get different masses from the U(1)X symmetry breaking. The field Y, which is another dark matter candidate due to the unbroken Z3 symmetry, belongs to the Strongly Interacting Massive Particle (SIMP)-type dark matter. Both XI and XR may contribute to Y’s 3 → 2 annihilation processes, opening a new class of SIMP models with a local dark gauge symmetry. Depending on the mass difference between XI and XR, we have either two-component or three-component dark matter scenarios. In particular two- or three-component SIMP scenarios can be realised not only for small mass difference between X and Y, but also for large mass hierarchy between them, which is a new and unique feature of the present model. We consider both theoretical and experimental constraints, and present four case studies of the multi-component dark matter scenarios.

Search for vector-like quarks in a fermionic dark matter model with pseudoscalar: A resonance case

2018 ◽  
Vol 33 (27) ◽  
pp. 1850159
Author(s):  
Seyed Yaser Ayazi ◽  
Ahmad Mohamadnejad ◽  
S. Peyman Zakeri
Keyword(s):  
Dark Matter ◽  
Coupling Strength ◽  
Minimal Model ◽  
Resonance Case ◽  
Proposed Model ◽  
Relic Density ◽  
Matter Model ◽  
The Subject ◽  
Dark Matter Model ◽  
New Particles

We propose a minimal model of a fermionic dark matter with a pseudoscalar mediator and N generation of vector-like quarks. We calculate the relic density and obtain a new constraint on the generation of the vector-like quarks. From the viewpoint of phenomenology, we probe the proposed model via direct and indirect approaches. Finally, as an illustrative example, we evaluate a resonance case — the subject of major experiments designed for detection of new particles. Our analysis results in significant constraints on the coupling strength of vector-like quarks.

scholarly journals The Minimal Model of nonbaryonic dark matter: a singlet scalar

2001 ◽  
Vol 619 (1-3) ◽  
pp. 709-728 ◽  
Author(s):  
C.P. Burgess ◽  
Maxim Pospelov ◽  
Tonnis ter Veldhuis
Keyword(s):  
Dark Matter ◽  
Minimal Model

NEUTRINO MASS AND COLD DARK MATTER PARTICLES IN BIG-BANG NUCLEOSYNTHESIS

2008 ◽  
Vol 23 (27n30) ◽  
pp. 2427-2442 ◽  
Author(s):  
TOSHITAKA KAJINO ◽  
MOTOHIKO KUSAKABE ◽  
KAZUHIKO KOJIMA ◽  
TAKASHI YOSHIDA ◽  
DAI G. YAMAZAKI ◽  
...  
Keyword(s):  
Dark Matter ◽  
Neutrino Mass ◽  
Critical Role ◽  
Massive Particle ◽  
Light Element ◽  
Dark Matter Particle ◽  
Big Bang ◽  
Particle Model ◽  
Mass Hierarchy ◽  
Big Bang Nucleosynthesis

Neutrino is a tiny weakly interacting massive particle, but it has strong impacts on various cosmological and astrophysical phenomena. Neutrinos play a critical role in nucleosynthesis of light-to-heavy mass elements in core-collapse supernovae. The light element synthesis is particularly affected by neutrino oscillation (MSW) effect through the ν-process. We propose first that precise determination of sin 2 2θ13 and mass hierarchy can be made by a theoretical study of the observed 7 Li /11 B ratio in stars and presolar grains which are produced from SN ejecta. Theoretical sensitivity in our proposed method is shown to be superior to ongoing long-baseline neutrino experiments for the parameter region 10−4 ≤ sin22θ13 ≤ 10−2. We secondly discuss how to constrain the neutrino mass Σmν from precise analysis of cosmic microwave background anisotropies in the presence of primordial magnetic field. We obtain an upper limit Σmν < 1.3 eV (2σ). Thirdly, we discuss decaying dark-matter particle model in order to solve the primordial lithium problems that the standard Big-Bang nucleosynthesis theory predicts extremely different 6 Li and 7 Li abundances from observations.

scholarly journals Higgs decays to dark matter: Beyond the minimal model

2011 ◽  
Vol 84 (11) ◽  
Author(s):  
Maxim Pospelov ◽  
Adam Ritz
Keyword(s):  
Dark Matter ◽  
Minimal Model

scholarly journals DARK MATTER SEARCHES WITH SUB-keV GERMANIUM DETECTOR

2010 ◽  
Vol 25 (11n12) ◽  
pp. 944-950
Author(s):  
HENRY T. WONG
Keyword(s):  
Dark Matter ◽  
Research Program ◽  
Magnetic Moments ◽  
Germanium Detector ◽  
Coherent Scattering ◽  
Low Energy ◽  
Underground Laboratory ◽  
Germanium Detectors ◽  
Low Mass ◽  
Under Construction

The theme of the TEXONO research program is on the studies of low energy neutrino and dark matter physics. The current goals are on the development of germanium detectors with sub-keV sensitivities to realize experiments on neutrino magnetic moments, neutrino-nucleus coherent scattering, as well as WIMP dark matter searches. A threshold of 100–200 eV was achieved with prototype detectors at the Kuo-Sheng Neutrino Laboratory. New limits were placed for low-mass WIMPs. The dark matter program will move to a new underground laboratory currently under construction in Sichuan, China.

scholarly journals Cosmic ray excesses from multi-component dark matter decays

2014 ◽  
Vol 29 (37) ◽  
pp. 1440003 ◽  
Author(s):  
Chao-Qiang Geng ◽  
Da Huang ◽  
Lu-Hsing Tsai
Keyword(s):  
Dark Matter ◽  
Cosmic Ray ◽  
Parameter Range ◽  
Decay Channels ◽  
Positron Fraction ◽  
Flavor Structure ◽  
Two Component ◽  
Decaying Dark Matter ◽  
Interesting Variation ◽  
Γ Ray

We use multi-component decaying dark matter (DM) scenario to explain the possible cosmic ray excesses in the positron fraction recently confirmed by AMS-02 and the total e+ +e- flux observed by Fermi-LAT. In the two-component DM models, we find an interesting variation of the flavor structure along with the cutoff of the heavy DM. For the three-component DM case, we focus on a particular parameter range in which the best fits prefer to open only two DM decay channels with a third DM contributing nothing to the electron and positron spectra. We show that all models give the reasonable fits to both the AMS-02 positron fraction and the Fermi-LAT total e++e- flux, which are also consistent with the measured diffuse γ-ray flux by Fermi-LAT.

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