scholarly journals Sterile neutrino dark matter and leptogenesis in Left-Right Higgs Parity

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
David Dunsky ◽  
Lawrence J. Hall ◽  
Keisuke Harigaya
Keyword(s):  
Dark Matter ◽  
Parameter Space ◽  
Top Quark ◽  
Baryon Asymmetry ◽  
Mass Hierarchy ◽  
Top Quark Mass ◽  
Quartic Coupling ◽  
Neutrino Mass Hierarchy ◽  
The Right ◽  
Freeze Out

Abstract The standard model Higgs quartic coupling vanishes at (109 − 1013) GeV. We study SU(2)L× SU(2)R× U(1)B−L theories that incorporate the Higgs Parity mechanism, where this becomes the scale of Left-Right symmetry breaking, vR. Furthermore, these theories solve the strong CP problem and predict three right-handed neutrinos. We introduce cosmologies where SU(2)R× U(1)B−L gauge interactions produce right-handed neutrinos via the freeze-out or freeze-in mechanisms. In both cases, we find the parameter space where the lightest right-handed neutrino is dark matter and the decay of a heavier one creates the baryon asymmetry of the universe via leptogenesis. A theory of flavor is constructed that naturally accounts for the lightness and stability of the right-handed neutrino dark matter, while maintaining sufficient baryon asymmetry. The dark matter abundance and successful natural leptogenesis require vR to be in the range (1010− 1013) GeV for freeze-out, in remarkable agreement with the scale where the Higgs quartic coupling vanishes, whereas freeze-in requires vR ≳ 109 GeV. The allowed parameter space can be probed by the warmness of dark matter, precise determinations of the top quark mass and QCD coupling by future colliders and lattice computations, and measurement of the neutrino mass hierarchy.

scholarly journals Electric dipole moments in the extended scotogenic models

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Motoko Fujiwara ◽  
Junji Hisano ◽  
Chihiro Kanai ◽  
Takashi Toma
Keyword(s):  
Parameter Space ◽  
Electric Dipole ◽  
Dipole Moments ◽  
Mass Hierarchy ◽  
Neutrino Mass Hierarchy ◽  
Electric Dipole Moments ◽  
Yukawa Couplings ◽  
Unitarity Bound ◽  
Charged Leptons ◽  
Electron Edm

Abstract Electric dipole moments (EDMs) of charged leptons arise from a new source of CP violation in the lepton sector. In this paper, we calculate the EDMs of the charged leptons in the minimal scotogenic model with two singlet fermions, and the models extended with one or two triplet fermions instead of the singlet fermions, taking into account the constraints of the neutrino oscillation data, the charged lepton flavor violation and perturbative unitarity bound for the Yukawa couplings. We show that the hybrid model with one singlet and one triplet fermions predicts an electron EDM larger than the other models in both normal and inverted neutrino mass hierarchy. We find some parameter space has already been ruled out by the current upper bound of the electron EDM and further parameter space can be explored by future experiments.

ELECTROWEAK PRODUCTION OF BARYON ASYMMETRY AND UPPER BOUNDS ON THE HIGGS AND TOP MASSES

1987 ◽  
Vol 02 (06) ◽  
pp. 417-427 ◽  
Author(s):  
A.I. BOCHKAREV ◽  
M.E. SHAPOSHNIKOV
Keyword(s):  
Upper Bound ◽  
Top Quark ◽  
Quark Mass ◽  
Preexponential Factor ◽  
Baryon Number ◽  
Upper Bounds ◽  
Baryon Asymmetry ◽  
Boson Mass ◽  
Top Quark Mass ◽  
Electroweak Phase Transition

We determine the upper bound on the Higgs boson mass from the condition that baryon asymmetry produced during the electroweak phase transition should not be diluted by the anomalous electroweak baryon number non-conserving processes. The value is insensitive to the mass of t-quark and equal to 45 GeV, slightly depending on the magnitute of the preexponential factor in the rate of the B non-conservation. This gives also upper bound on the top quark mass mt<80 GeV .

scholarly journals Dark matter detection, Standard Model parameters and Intermediate Scale Supersymmetry

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
David Dunsky ◽  
Lawrence J. Hall ◽  
Keisuke Harigaya
Keyword(s):  
Dark Matter ◽  
Strong Coupling ◽  
Top Quark ◽  
Quark Mass ◽  
Strong Coupling Constant ◽  
Model Parameters ◽  
Coupling Constant ◽  
Top Quark Mass ◽  
Intermediate Scale ◽  
Dark Matter Mass

Abstract The vanishing of the Higgs quartic coupling at a high energy scale may be explained by Intermediate Scale Supersymmetry, where supersymmetry breaks at (109-1012) GeV. The possible range of supersymmetry breaking scales can be narrowed down by precise measurements of the top quark mass and the strong coupling constant. On the other hand, nuclear recoil experiments can probe Higgsino or sneutrino dark matter up to a mass of 1012 GeV. We derive the correlation between the dark matter mass and precision measurements of standard model parameters, including supersymmetric threshold corrections. The dark matter mass is bounded from above as a function of the top quark mass and the strong coupling constant. The top quark mass and the strong coupling constant are bounded from above and below respectively for a given dark matter mass. We also discuss how the observed dark matter abundance can be explained by freeze-out or freeze-in during a matter-dominated era after inflation, with the inflaton condensate being dissipated by thermal effects.

RG-IMPROVED BOUNDS ON HIGGS BOSON AND TOP QUARK MASSES FROM ELECTROWEAK BARYOGENESIS

1994 ◽  
Vol 09 (05) ◽  
pp. 459-464 ◽  
Author(s):  
A.S. MAJUMDAR ◽  
S.K. SETHI ◽  
S. MAHAJAN ◽  
A. MUKHERJEE ◽  
N. PANCHAPAKESAN ◽  
...  
Keyword(s):  
Renormalization Group ◽  
Higgs Boson ◽  
Top Quark ◽  
Quark Mass ◽  
Higgs Mass ◽  
Higgs Doublet ◽  
Baryon Asymmetry ◽  
Top Quark Mass ◽  
Quark Masses ◽  
Doublet Model

Electroweak baryogenesis in a single Higgs doublet model is considered. A renormalization group-improved effective potential is used. The requirement that the created baryon asymmetry is not washed out leads to bounds on the Higgs mass which vary significantly with the top quark mass.

scholarly journals A review of WIMP baryogenesis mechanisms

2015 ◽  
Vol 30 (37) ◽  
pp. 1530028 ◽  
Author(s):  
Yanou Cui
Keyword(s):  
Dark Matter ◽  
Simple Model ◽  
Large Hadron Collider ◽  
Early Universe ◽  
Particle Physics ◽  
Hadron Collider ◽  
Baryon Asymmetry ◽  
Weakly Interacting Massive Particles ◽  
Modern Cosmology ◽  
Freeze Out

It was recently proposed that weakly interacting massive particles (WIMP) may provide new ways of generating the observed baryon asymmetry in the early universe, as well as addressing the cosmic coincidence between dark matter (DM) and baryon abundances. This suggests a new possible connection between weak scale new particle physics and modern cosmology. This review summarizes the general ideas and simple model examples of the two recently proposed WIMP baryogenesis mechanisms: baryogenesis from WIMP DM annihilation during thermal freeze-out, and baryogenesis from metastable WIMP decay after thermal freeze-out. This review also discusses the interesting phenomenology of these models, in particular, the experimental signals that can be probed in the intensity frontier experiments and the large hadron collider (LHC) experiments.

scholarly journals Neutrino mass, leptogenesis and sterile neutrino dark matter in inverse seesaw framework

2021 ◽  
pp. 2150146
Author(s):  
Nayana Gautam ◽  
Mrinal Kumar Das
Keyword(s):  
Dark Matter ◽  
Neutrino Mass ◽  
Parameter Space ◽  
Sterile Neutrino ◽  
Baryon Asymmetry ◽  
Inverted Hierarchy ◽  
Lepton Asymmetry ◽  
The Standard Model ◽  
Active Mixing ◽  
The Universe

We study [Formula: see text] flavor symmetric inverse seesaw model which has the possibility of simultaneously addressing neutrino phenomenology, dark matter (DM) and baryon asymmetry of the universe (BAU) through leptogenesis. The model is the extension of the standard model by the addition of two (RH) neutrinos and three sterile fermions leading to a keV scale sterile neutrino DM and two pairs of quasi-Dirac states. The CP violating decay of the lightest quasi-Dirac pair present in the model generates lepton asymmetry which then converts to BAU. Thus, this model can provide a simultaneous solution for nonzero neutrino mass, DM content of the universes and the observed baryon asymmetry. The [Formula: see text] flavor symmetry in this model is augmented by additional [Formula: see text] symmetry to constrain the Yukawa Lagrangian. A detailed numerical analysis has been carried out to obtain DM mass, DM-active mixing as well as BAU both for normal hierarchy as well as inverted hierarchy. We try to correlate the two cosmological observables and found a common parameter space satisfying the DM phenomenology and BAU. The parameter space of the model is further constrained from the latest cosmological bounds on the observables.

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