scholarly journals Closing the window on WIMP Dark Matter

2022 ◽  
Vol 82 (1) ◽  
Author(s):  
Salvatore Bottaro ◽  
Dario Buttazzo ◽  
Marco Costa ◽  
Roberto Franceschini ◽  
Paolo Panci ◽  
...  
Keyword(s):  
Dark Matter ◽  
Gauge Boson ◽  
Bound States ◽  
Direct Detection ◽  
High Energy ◽  
Tree Level ◽  
Boson Exchange ◽  
Future Collider ◽  
Sommerfeld Enhancement ◽  
The Masses

AbstractWe study scenarios where Dark Matter is a weakly interacting particle (WIMP) embedded in an ElectroWeak multiplet. In particular, we consider real SU(2) representations with zero hypercharge, that automatically avoid direct detection constraints from tree-level Z-exchange. We compute for the first time all the calculable thermal masses for scalar and fermionic WIMPs, including Sommerfeld enhancement and bound states formation at leading order in gauge boson exchange and emission. WIMP masses of few hundred TeV are shown to be compatible both with s-wave unitarity of the annihilation cross-section, and perturbativity. We also provide theory uncertainties on the masses for all multiplets, which are shown to be significant for large SU(2) multiplets. We then outline a strategy to probe these scenarios at future experiments. Electroweak 3-plets and 5-plets have masses up to about 16 TeV and can efficiently be probed at a high energy muon collider. We study various experimental signatures, such as single and double gauge boson emission with missing energy, and disappearing tracks, and determine the collider energy and luminosity required to probe the thermal Dark Matter masses. Larger multiplets are out of reach of any realistic future collider, but can be tested in future $$\gamma $$ γ -ray telescopes and possibly in large-exposure liquid Xenon experiments.

scholarly journals The CP violation and scalar dark matter in a 331 model

2021 ◽  
Vol 36 (09) ◽  
pp. 2150057
Author(s):  
M. J. Neves
Keyword(s):  
Dark Matter ◽  
Scalar Field ◽  
Cp Violation ◽  
Gauge Boson ◽  
Matter Content ◽  
Tree Level ◽  
Cp Violations ◽  
Dark Matter Mass ◽  
The Standard Model ◽  
The Masses

The 331 model with right-handed neutrinos is reassessed to investigate the CP violation in the quark sector. After the spontaneous symmetry breaking, the masses and physical fields of the particle content are obtained. The fermions content of the 331 model is enlarged to include exotic quarks with known electric charge and with masses defined at the TeV scale. The existence of these exotic quarks induces extra CP violations via couplings with quarks of the Standard Model mediated by charged gauge boson with mass fixed at the TeV scale. An extra discrete [Formula: see text] symmetry is introduced in the 331 model to get a stable scalar field that can be a candidate to the dark matter content. The new scalar field interacts at the tree level with the [Formula: see text] gauge boson that works as a dark matter portal. The relic density associated with the scalar field is calculated to yield the solution mass that satisfies the observed dark matter. The region allowed on the parameter space of the dark matter mass versus [Formula: see text] mass is obtained to include the bounds of PANDAX2017, XENON1T(2t.y) and LUX experiments.

scholarly journals Charged scalar production at the compact linear collider for the $$S_3 \otimes \mathbb {Z}_2$$ model

2020 ◽  
Vol 80 (11) ◽  
Author(s):  
G. De Conto ◽  
A. C. B. Machado ◽  
J. Montaño ◽  
P. Chimenti
Keyword(s):  
Total Cross Section ◽  
Cross Section ◽  
Linear Collider ◽  
Direct Detection ◽  
Indirect Detection ◽  
Tree Level ◽  
Charged Scalar ◽  
Exotic Particles ◽  
Small Influence ◽  
The Masses

AbstractWe present a model with $$S_3 \otimes \mathbb {Z}_2$$ S 3 ⊗ Z 2 model plus a sterile neutrino and its phenomenological expectations for the production of charged scalars at the compact linear collider. At tree level, our model predicts a total cross section in between 0.1 and $$10^{-5}$$ 10 - 5 pb for the $$e^- e^+ \rightarrow H^+ H^-$$ e - e + → H + H - process, considering all possible mass values for the charged scalar in the CLIC experiment. We also show that this prediction holds regardless of the masses of the other exotic particles and their couplings. We also show that an indirect detection from its effects in the $$e \overline{e} \rightarrow e \overline{e}$$ e e ¯ → e e ¯ + missing energy process is possible under specific conditions, or a direct detection under other circumstances. However, one cannot use this process to study the sterile neutrinos present in this model, given that they have a small influence in the total cross-section for the direct detection of the exotic scalar to be possible.

scholarly journals Leptogenesis from a U(1)D resonance

2020 ◽  
Vol 2020 (8) ◽  
Author(s):  
Eung Jin Chun ◽  
Arnab Dasgupta ◽  
Sin Kyu Kang
Keyword(s):  
Dark Matter ◽  
Cp Violation ◽  
Imaginary Part ◽  
Gauge Boson ◽  
Lepton Number ◽  
Tree Level ◽  
Effective Coupling ◽  
Energy Correction ◽  
Self Energy

Abstract We propose a novel mechanism to realize leptogenesis through the Breit- Wigner resonance of a dark U(1)D gauge boson ZD , which mediates lepton number vi- olating annihilations of dark matter (DM) in the context of the scotogenic model with a U(1)D . The processes occur out of equilibrium and DM freezes out later giving rise to the observed abundance. The CP violation required for leptogenesis can be achieved by the interference between tree-level t-channel scattering of DM and the subsequent 1-loop mediated by ZD , which arises due to the unremovable imaginary part of either the ZD propagator coming from its self-energy correction or the 1-loop giving rise to the effective coupling of $$ {Z}_D\overline{\nu}\nu $$ Z D ν ¯ ν .

scholarly journals Analogies between nuclear physics and dark matter

2014 ◽  
Vol 29 (39) ◽  
pp. 1450209 ◽  
Author(s):  
D. Cárcamo ◽  
A. Riveros ◽  
J. Gamboa
Keyword(s):  
Dark Matter ◽  
Cross Sections ◽  
Nuclear Physics ◽  
Tree Level ◽  
Total Cross Sections ◽  
Sommerfeld Enhancement ◽  
Body Potential

A fermionic description of dark matter using analogies with nuclear physics is developed. At tree level, scalar and vector processes are considered and the two-body potential are explicitly calculated using the Breit approximation. We show that the total cross-sections in both cases exhibit Sommerfeld enhancement.

scholarly journals Dark matter in minimal dimensional transmutation with multicritical-point principle

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Yuta Hamada ◽  
Hikaru Kawai ◽  
Kin-ya Oda ◽  
Kei Yagyu
Keyword(s):  
Dark Matter ◽  
Cross Section ◽  
Scale Invariance ◽  
Direct Detection ◽  
Planck Scale ◽  
Higgs Field ◽  
Scalar Fields ◽  
Tree Level ◽  
Multicritical Point ◽  
Dimensional Transmutation

Abstract We investigate a model with two real scalar fields that minimally generates exponentially different scales in an analog of the Coleman-Weinberg mechanism. The classical scale invariance — the absence of dimensionful parameters in the tree-level action, required in such a scale generation — can naturally be understood as a special case of the multicritical-point principle. This two-scalar model can couple to the Standard Model Higgs field to realize a maximum multicriticality (with all the dimensionful parameters being tuned to critical values) for field values around the electroweak scale, providing a generalization of the classical scale invariance to a wider class of criticality. As a bonus, one of the two scalars can be identified as Higgs-portal dark matter. We find that this model can be consistent with the constraints from dark matter relic abundance, its direct detection experiments, and the latest LHC data, while keeping the perturbativity up to the reduced Planck scale. We then present successful benchmark points satisfying all these constraints: the mass of dark matter is a few TeV, and its scattering cross section with nuclei is of the order of 10−9 pb, reachable in near future experiments. The mass of extra Higgs boson H is smaller than or of the order of 100 GeV, and the cross section of e+e− → ZH can be of fb level for collision energy 250 GeV, targetted at future lepton colliders.

scholarly journals Gamma-ray line from electroweakly interacting non-abelian spin-1 dark matter

2021 ◽  
Vol 2021 (10) ◽  
Author(s):  
Tomohiro Abe ◽  
Motoko Fujiwara ◽  
Junji Hisano ◽  
Kohei Matsushita
Keyword(s):  
Dark Matter ◽  
Cross Sections ◽  
Line Search ◽  
Gamma Ray ◽  
Galactic Center ◽  
Photon Emission ◽  
Strong Constraint ◽  
Wave States ◽  
Sommerfeld Enhancement ◽  
The Masses

Abstract We study gamma-ray line signatures from electroweakly interacting non-abelian spin-1 dark matter (DM). In this model, Z2-odd spin-1 particles including a DM candidate have the SU(2)L triplet-like features, and the Sommerfeld enhancement is relevant in the annihilation processes. We derive the annihilation cross sections contributing to the photon emission and compare with the SU(2)L triplet fermions, such as Wino DM in the supersymmetric Standard Model. The Sommerfeld enhancement factor is approximately the same in both systems, while our spin-1 DM predicts the larger annihilation cross sections into γγ/Zγ modes than those of the Wino by $$ \frac{38}{9} $$ 38 9 . This is because a spin-1 DM pair forms not only J = 0 but also J = 2 partial wave states where J denotes the total spin angular momentum. Our spin-1 DM also has a new annihilation mode into Z2-even extra heavy vector and photon, Z′γ. For this mode, the photon energy depends on the masses of DM and the heavy vector, and thus we have a chance to probe the mass spectrum. The latest gamma-ray line search in the Galactic Center region gives a strong constraint on our spin-1 DM. We can probe the DM mass for ≲ 25.3 TeV by the Cherenkov Telescope Array experiment even if we assume a conservative DM density profile.

scholarly journals Dark matter electromagnetic dipoles: the WIMP expectation

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
Thomas Hambye ◽  
Xun-Jie Xu
Keyword(s):  
Dark Matter ◽  
Cross Sections ◽  
Direct Detection ◽  
Dipole Moments ◽  
Tree Level ◽  
Photon Exchange ◽  
Nucleus Scattering ◽  
The One ◽  
Scattering Cross Sections ◽  
Near Future

Abstract We perform a systematic study of the electric and magnetic dipole moments of dark matter (DM) that are induced at the one-loop level when DM experiences four-fermion interactions with Standard Model (SM) charged fermions. Related to their loop nature these moments can largely depend on the UV completion at the origin of the four-fermion operators. We illustrate this property by considering explicitly two simple ways to generate these operators, from t- or s-channel tree-level exchange. Fixing the strength of these interactions from the DM relic density constraint, we obtain in particular a magnetic moment that, depending on the interaction considered, lies typically between 10−20 to 10−23 ecm or identically vanishes. These non-vanishing values induce, via photon exchange, DM-nucleus scattering cross sections that could be probed by current or near future direct detection experiments.

scholarly journals Thermal relic of self-interacting dark matter with retarded decay of mediator

2021 ◽  
Vol 2021 (12) ◽  
Author(s):  
Bin Zhu ◽  
Murat Abdughani
Keyword(s):  
Dark Matter ◽  
Direct Detection ◽  
Large Mass ◽  
Bound State ◽  
Blind Spot ◽  
Mass Splitting ◽  
Temperature Evolution ◽  
S Wave ◽  
Sommerfeld Enhancement ◽  
Freeze Out

Abstract The existence of a light mediator is beneficial to some phenomena in astroparticle physics, such as the core-cusp problem and diversity problem. It can decouple from Standard Model to avoid direct detection constraints, generally realized by retard decay of the mediator. Their out-of-equilibrium decay process changes the dark matter (DM) freeze-out via temperature discrepancy. This type of hidden sector (HS) typically requires a precision calculation of the freeze-out process considering HS temperature evolution and the thermal average of the cross-section. If the mediator is light sufficiently, we can not ignore the s-wave radiative bound state formation process from the perspective of CMB ionization and Sommerfeld enhancement. We put large mass splitting between DM and mediator, different temperature evolution on the same theoretical footing, discussing the implication for DM relic density in this HS. We study this model and illustrate its property by considering the general Higgs-portal dark matter scenario, which includes all the relevant constraints and signals. It shows that the combination of BBN and CMB constraint favors the not-too-hot HS, rinf< 102, for the positive cubic interaction of mediator scenario. On the other hand, the negative cubic interaction is ruled out except for our proposed blind spot scenario.

scholarly journals The new “MUON G-2” result and supersymmetry

2021 ◽  
Vol 81 (12) ◽  
Author(s):  
Manimala Chakraborti ◽  
Sven Heinemeyer ◽  
Ipsita Saha
Keyword(s):  
Experimental Data ◽  
Dark Matter ◽  
Standard Model ◽  
Anomalous Magnetic Moment ◽  
Direct Detection ◽  
High Energy ◽  
Experimental Result ◽  
Susy Particle ◽  
Upper Limits ◽  
The Universe

AbstractThe electroweak (EW) sector of the Minimal Supersymmetric Standard Model (MSSM), with the lightest neutralino as Dark Matter (DM) candidate, can account for a variety of experimental data. This includes the DM content of the universe, DM direct detection limits, EW SUSY searches at the LHC and in particular the so far persistent $$3-4\,\sigma $$ 3 - 4 σ discrepancy between the experimental result for the anomalous magnetic moment of the muon, $$(g-2)_\mu $$ ( g - 2 ) μ , and its Standard Model (SM) prediction. The recently published “MUON G-2” result is within $${0.8}\,\sigma $$ 0.8 σ in agreement with the older BNL result on $$(g-2)_\mu $$ ( g - 2 ) μ . The combination of the two results was given as $$a_\mu ^{\mathrm{exp}} = (11 659 {206.1}\pm {4.1}) \times 10^{-10}$$ a μ exp = ( 11659 206.1 ± 4.1 ) × 10 - 10 , yielding a new deviation from the SM prediction of $$\Delta a_\mu = ({25.1}\pm {5.9}) \times 10^{-10}$$ Δ a μ = ( 25.1 ± 5.9 ) × 10 - 10 , corresponding to $${4.2}\,\sigma $$ 4.2 σ . Using this improved bound we update the results presented in Chakraborti et al. (Eur Phys J C 80(10):984, 2020) and set new upper limits on the allowed parameters space of the EW sector of the MSSM. We find that with the new $$(g-2)_\mu $$ ( g - 2 ) μ result the upper limits on the (next-to-) lightest SUSY particle are in the same ballpark as previously, yielding updated upper limits on these masses of $$\sim 750 \,\, \mathrm {GeV}$$ ∼ 750 GeV . In this way, a clear target is confirmed for future (HL-)LHC EW searches, as well as for future high-energy $$e^+e^-$$ e + e - colliders, such as the ILC or CLIC.

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