scholarly journals Towards a fundamental safe theory of composite Higgs and dark matter

2020 ◽  
Vol 80 (11) ◽  
Author(s):  
Giacomo Cacciapaglia ◽  
Teng Ma ◽  
Shahram Vatani ◽  
Yongcheng Wu
Keyword(s):  
Dark Matter ◽  
Fixed Point ◽  
Direct Detection ◽  
Mass Range ◽  
Dark Matter Candidate ◽  
Next Generation ◽  
Electroweak Scale ◽  
Mass Gap ◽  
Composite Higgs ◽  
Partial Compositeness

AbstractWe present a novel paradigm that allows to define a composite theory at the electroweak scale that is well defined all the way up to any energy by means of safety in the UV. The theory flows from a complete UV fixed point to an IR fixed point for the strong dynamics (which gives the desired walking) before generating a mass gap at the TeV scale. We discuss two models featuring a composite Higgs, Dark Matter and partial compositeness for all SM fermions. The UV theories can also be embedded in a Pati–Salam partial unification, thus removing the instability generated by the $$\text{ U }(1)$$ U ( 1 ) running. Finally, we find a Dark Matter candidate still allowed at masses of 260 GeV, or 1.5–2 TeV, where the latter mass range will be covered by next generation direct detection experiments.

scholarly journals Lattice study of the scalar and baryon spectra in many-flavor QCD

2017 ◽  
Vol 32 (35) ◽  
pp. 1747010
Author(s):  
Yasumichi Aoki ◽  
Tatsumi Aoyama ◽  
Ed Bennett ◽  
Masafumi Kurachi ◽  
Toshihide Maskawa ◽  
...  
Keyword(s):  
Dark Matter ◽  
Higgs Boson ◽  
Decay Constant ◽  
Direct Detection ◽  
Bilinear Operator ◽  
Dark Matter Candidate ◽  
Baryon State ◽  
Composite Higgs ◽  
Attractive Candidate ◽  
Baryon Spectra

In the search for a composite Higgs boson in walking technicolor models, many flavor QCD, in particular with [Formula: see text], is an attractive candidate, and has been found to have a composite flavor-singlet scalar as light as the pion. Based on lattice simulations of this theory with the HISQ action, we will present our preliminary results on the scalar decay constant using the fermionic bilinear operator, and on the mass of the lightest baryon state which could be a dark matter candidate. Combining these two results, implications for dark matter direct detection are also discussed.

scholarly journals Dark Matter Constraints and the Neutralino Sector of the scNMSSM

Universe ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. 31
Author(s):  
Elham Aldufeery ◽  
Maien Binjonaid
Keyword(s):  
Dark Matter ◽  
Parameter Space ◽  
Cross Sections ◽  
Direct Detection ◽  
Mass Range ◽  
Upper And Lower Bounds ◽  
Dark Matter Candidate ◽  
Dark Matter Relic Density ◽  
Relic Density ◽  
Moderate Range

The neutralino sector of the semi-constrained next-to-minimal supersymmetric standard model is explored under recent experimental constraints, with special attention to dark matter (DM) limits. The effects of the upper and lower bounds of dark matter relic density and recent direct detection constraints on spin-independent and -dependent cross-sections are thoroughly analyzed. Particularly, we show which regions of the parameter space are ruled out due to the different dark matter constraints and the corresponding model-specific parameters: λ,κ,Aλ, and Aκ. We analyze all annihilation and co-annihilation processes (with heavier neutralinos and charginos) that contribute to the dark matter relic density. The mass components of the dark matter candidate, the lightest neutralino χ˜10, are studied, and the decays of heavy neutralinos and charginos, especially χ˜20 and χ˜1+, into the lightest neutralino are examined. We impose semi-universal boundary conditions at the Grand Unified Theory scale, and require a moderate range of tanβ≲10. We find that the allowed parameter space is associated with a heavy mass spectrum in general and that the lightest neutralino is mostly Higgsino with a mass range that resides mostly between 1000 and 1500 GeV. However, smaller mass values can be achieved if the DM candidate is bino-like or singlino-like.

scholarly journals Relativistic impulse approximation in the atomic ionization process induced by millicharged particles

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Chen-Kai Qiao ◽  
Shin-Ted Lin ◽  
Hsin-Chang Chi ◽  
Hai-Tao Jia
Keyword(s):  
Dark Matter ◽  
Cross Sections ◽  
Direct Detection ◽  
Impulse Approximation ◽  
Dark Matter Particle ◽  
Ionization Process ◽  
Beyond The Standard Model ◽  
Next Generation ◽  
Many Body ◽  
Atomic Ionization

Abstract The millicharged particle has become an attractive topic to probe physics beyond the Standard Model. In direct detection experiments, the parameter space of millicharged particles can be constrained from the atomic ionization process. In this work, we develop the relativistic impulse approximation (RIA) approach, which can duel with atomic many-body effects effectively, in the atomic ionization process induced by millicharged particles. The formulation of RIA in the atomic ionization induced by millicharged particles is derived, and the numerical calculations are obtained and compared with those from free electron approximation and equivalent photon approximation. Concretely, the atomic ionizations induced by mllicharged dark matter particles and millicharged neutrinos in high-purity germanium (HPGe) and liquid xenon (LXe) detectors are carefully studied in this work. The differential cross sections, reaction event rates in HPGe and LXe detectors, and detecting sensitivities on dark matter particle and neutrino millicharge in next-generation HPGe and LXe based experiments are estimated and calculated to give a comprehensive study. Our results suggested that the next-generation experiments would improve 2-3 orders of magnitude on dark matter particle millicharge δχ than the current best experimental bounds in direct detection experiments. Furthermore, the next-generation experiments would also improve 2-3 times on neutrino millicharge δν than the current experimental bounds.

Neutrino emission from the collapse of ∼104 M⊙ Population III supermassive stars

2021 ◽  
Vol 508 (1) ◽  
pp. 828-841
Author(s):  
Chris Nagele ◽  
Hideyuki Umeda ◽  
Koh Takahashi ◽  
Takashi Yoshida ◽  
Kohsuke Sumiyoshi
Keyword(s):  
Dark Matter ◽  
Massive Star ◽  
Direct Detection ◽  
Mass Range ◽  
Core Collapse ◽  
Low Density ◽  
Large Radius ◽  
Neutrino Luminosity ◽  
Neutrino Background ◽  
Population Iii

ABSTRACT We calculate the neutrino signal from Population III supermassive star (SMS) collapse using a neutrino transfer code originally developed for core-collapse supernovae and massive star collapse. Using this code, we are able to investigate the SMS mass range thought to undergo neutrino trapping (∼104 M⊙), a mass range which has been neglected by previous works because of the difficulty of neutrino transfer. For models in this mass range, we observe a neutrino sphere with a large radius and low density compared to typical massive star neutrino spheres. We calculate the neutrino light curve emitted from this neutrino sphere. The resulting neutrino luminosity is significantly lower than the results of a previous analytical model. We briefly discuss the possibility of detecting a neutrino burst from an SMS or the neutrino background from many SMSs and conclude that the former is unlikely with current technology, unless the SMS collapse is located as close as 1 Mpc, while the latter is also unlikely even under very generous assumptions. However, the SMS neutrino background is still of interest as it may serve as a source of noise in proposed dark matter direct detection experiments.

scholarly journals On the neutralino as dark matter candidate. II. Direct detection

1994 ◽  
Vol 2 (1) ◽  
pp. 77-90 ◽  
Author(s):  
A. Bottino ◽  
V. de Alfaro ◽  
N. Fornengo ◽  
G. Mignola ◽  
Scopel S.
Keyword(s):  
Dark Matter ◽  
Direct Detection ◽  
Dark Matter Candidate

scholarly journals DARK MATTER CANDIDATE IN A HEAVY HIGGS MODEL: DIRECT DETECTION RATES

2008 ◽  
Vol 23 (24) ◽  
pp. 2011-2022 ◽  
Author(s):  
DEBASISH MAJUMDAR ◽  
AMBAR GHOSAL
Keyword(s):  
Dark Matter ◽  
Higgs Boson ◽  
Cold Dark Matter ◽  
Direct Detection ◽  
Scalar Potential ◽  
Higgs Model ◽  
Boson Mass ◽  
Dark Matter Candidate ◽  
Detection Rates ◽  
200 Gev

We investigate direct detection rates for Dark Matter candidates arise in a SU (2)L× U (1)Y with an additional doublet Higgs proposed by Barbieri, Hall and Rychkov. We refer to this model as "Heavy Higgs Model". The Standard Model Higgs mass comes out from this model is very heavy, so there is very slim chance that there is no Higgs boson mass below 200 GeV. The additional Higgs boson develops neither any VEV due to the choice of coefficient of the scalar potential of the model nor it has any coupling with fermions due to the incorporation of a discrete parity symmetry. Thus, the neutral components of the extra doublet are stable and can be considered as probable candidate of Cold Dark Matter. We have made calculations for three different types of Dark Matter experiments, namely, 76 Ge (like GENIUS), DAMA (NaI) and XENON (131 Xe ). Also demonstrated the annual variation of Dark Matter detection in case of all three

scholarly journals First results of the CAST-RADES haloscope search for axions at 34.67 μeV

2021 ◽  
Vol 2021 (10) ◽  
Author(s):  
A. Álvarez Melcón ◽  
S. Arguedas Cuendis ◽  
J. Baier ◽  
K. Barth ◽  
H. Bräuninger ◽  
...  
Keyword(s):  
Dark Matter ◽  
Mass Range ◽  
Dark Matter Candidate ◽  
Coupling Constant ◽  
Exclusion Limit ◽  
Dipole Magnet ◽  
Resonant Cavities ◽  
First Results ◽  
First Time ◽  
Photon Coupling

Abstract We present results of the Relic Axion Dark-Matter Exploratory Setup (RADES), a detector which is part of the CERN Axion Solar Telescope (CAST), searching for axion dark matter in the 34.67 μeV mass range. A radio frequency cavity consisting of 5 sub-cavities coupled by inductive irises took physics data inside the CAST dipole magnet for the first time using this filter-like haloscope geometry. An exclusion limit with a 95% credibility level on the axion-photon coupling constant of gaγ ≳ 4 × 10−13 GeV−1 over a mass range of 34.6738 μeV < ma< 34.6771 μeV is set. This constitutes a significant improvement over the current strongest limit set by CAST at this mass and is at the same time one of the most sensitive direct searches for an axion dark matter candidate above the mass of 25 μeV. The results also demonstrate the feasibility of exploring a wider mass range around the value probed by CAST-RADES in this work using similar coherent resonant cavities.

scholarly journals Scalar dark matter probes the scale of nonlocality

2019 ◽  
Vol 34 (24) ◽  
pp. 1950130 ◽  
Author(s):  
Anish Ghoshal
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Lower Bounds ◽  
Mass Formula ◽  
Direct Detection ◽  
Mass Range ◽  
The Standard Model ◽  
Infinite Derivative ◽  
Hierarchy Problems

Scalar dark matter (DM) in a theory introduces hierarchy problems, and suffers from the inability to predict the preferred mass range for the DM. In a WIMP-like minimal scalar DM setup we show that the infinite derivative theory can predict the DM mass and its coupling. The scale of nonlocality [Formula: see text] in such a theory in its lowermost limit (constrained by LHC) implies a DM mass [Formula: see text] TeV and a coupling with the Standard Model (SM) Higgs [Formula: see text]. Planned DM direct detection experiments reaching such sensitivity in the DM will effectively translate into lower bounds on the scale at which the nonlocality comes into the play.

MULTI-SINGLET AND SINGLET-TRIPLET SCALAR DARK MATTER

2011 ◽  
Vol 26 (27) ◽  
pp. 2039-2049 ◽  
Author(s):  
OLIVER FISCHER ◽  
J. J. VAN DER BIJ
Keyword(s):  
Dark Matter ◽  
Parameter Space ◽  
Mass Range ◽  
Direct Search ◽  
Dark Matter Candidate ◽  
Real Scalar ◽  
Two Component ◽  
Matter Model ◽  
Dark Matter Model ◽  
Scalar Singlet

We take the stealth model,1 an inert [Formula: see text] multiplet of real scalar singlets, as a candidate for dark matter. We limit the parameter space on the basis of dark matter abundance and direct search experiments. Further we study briefly a real scalar triplet as dark matter candidate. Then a two-component dark matter model is considered, which consists of a real scalar singlet and a scalar triplet with a Z2×Z2 symmetry. In a narrow mass range, the direct search experiments start to give some limitations.

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