scholarly journals Dark matter bound state formation in fermionic Z2 DM model with light dark photon and dark Higgs boson

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
Pyungwon Ko ◽  
Toshinori Matsui ◽  
Yi-Lei Tang
Keyword(s):  
Dark Matter ◽  
Higgs Boson ◽  
Gauge Symmetry ◽  
State Formation ◽  
Vector Boson ◽  
Goldstone Boson ◽  
Bound State ◽  
Dark Photon ◽  
Potential Matrix ◽  
Relic Abundance

Abstract If fermionic dark matter (DM) is stabilized by dark U(1) gauge symmetry that is spontaneously broken into its subgroup Z2, the particle contents of the model becomes very rich: DM and excited DM, both of them are Majorana fermions, as well as two dark force mediators, dark photon and dark Higgs boson are naturally present due to the underlying dark gauge symmetry. In this paper, we study the DM bound state formation processes within this scenario, assuming both dark photon and dark Higgs are light mediators and including the effects of excited DM. The Goldstone boson contributions to the potential matrix in the Schrödinger equations are found to be important. The emissions of a longitudinal vector boson (or somehow equivalently a Goldstone boson) during the DM bound state formations are crucial to induce a significant reannihilation process, reducing the dark matter relic abundance. Most of the stringent constraints for this kind of dark matter considered in the literature are simply evaded.

scholarly journals Indirect searches for dark matter bound state formation and level transitions

2020 ◽  
Vol 9 (5) ◽  
Author(s):  
Iason Baldes ◽  
Francesca Calore ◽  
Kalliopi Petraki ◽  
Vincent Poireau ◽  
Nicholas L. Rodd
Keyword(s):  
Dark Matter ◽  
State Formation ◽  
Bound States ◽  
Bound State ◽  
Photon Mass ◽  
Dark Photon ◽  
Dissipation Of Energy ◽  
Light Force

Indirect searches for dark matter (DM) have conventionally been applied to the products of DM annihilation or decay. If DM couples to light force carriers, however, it can be captured into bound states via dissipation of energy that may yield detectable signals. We extend the indirect searches to DM bound state formation and transitions between bound levels, and constrain the emission of unstable dark photons. Our results significantly refine the predicted signal flux that could be observed in experiments. As a concrete example, we use Fermi-LAT dwarf spheroidal observations to obtain constraints in terms of the dark photon mass and energy which we use to search for the formation of stable or unstable bound states.

scholarly journals Probing the explanation of the muon (g-2) anomaly and thermal light dark matter with the semi-visible dark photon channel

2021 ◽  
Vol 81 (10) ◽  
Author(s):  
C. Cazzaniga ◽  
P. Odagiu ◽  
E. Depero ◽  
L. Molina Bueno ◽  
Yu. M. Andreev ◽  
...  
Keyword(s):  
Dark Matter ◽  
Detection Efficiency ◽  
Vector Boson ◽  
Large Mass ◽  
New Physics ◽  
Mass Splitting ◽  
Dark Photon ◽  
Dark Matter Relic Density ◽  
Relic Abundance ◽  
Pseudo Scalar

AbstractWe report the results of a search for a new vector boson ($$ A'$$ A ′ ) decaying into two dark matter particles $$\chi _1 \chi _2$$ χ 1 χ 2 of different mass. The heavier $$\chi _2$$ χ 2 particle subsequently decays to $$\chi _1$$ χ 1 and an off-shell Dark Photon $$ A'^* \rightarrow e^+e^-$$ A ′ ∗ → e + e - . For a sufficiently large mass splitting, this model can explain in terms of new physics the recently confirmed discrepancy observed in the muon anomalous magnetic moment at Fermilab. Remarkably, it also predicts the observed yield of thermal dark matter relic abundance. A detailed Monte-Carlo simulation was used to determine the signal yield and detection efficiency for this channel in the NA64 setup. The results were obtained re-analyzing the previous NA64 searches for an invisible decay $$A'\rightarrow \chi \overline{\chi }$$ A ′ → χ χ ¯ and axion-like or pseudo-scalar particles $$a \rightarrow \gamma \gamma $$ a → γ γ . With this method, we exclude a significant portion of the parameter space justifying the muon g-2 anomaly and being compatible with the observed dark matter relic density for $$A'$$ A ′ masses from 2$$m_e$$ m e up to 390 MeV and mixing parameter $$\varepsilon $$ ε between $$3\times 10^{-5}$$ 3 × 10 - 5 and $$2\times 10^{-2}$$ 2 × 10 - 2 .

scholarly journals A global view of the off-shell Higgs portal

2020 ◽  
Vol 8 (2) ◽  
Author(s):  
Maximilian Ruhdorfer ◽  
Ennio Salvioni ◽  
Andreas Weiler
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Vector Boson ◽  
Effective Interaction ◽  
Goldstone Boson ◽  
High Energy ◽  
Beyond The Standard Model ◽  
The Standard Model ◽  
Higgs Portal ◽  
First Time

We study for the first time the collider reach on the derivative Higgs portal, the leading effective interaction that couples a pseudo Nambu-Goldstone boson (pNGB) scalar Dark Matter to the Standard Model. We focus on Dark Matter pair production through an off-shell Higgs boson, which is analyzed in the vector boson fusion channel. A variety of future high-energy lepton colliders as well as hadron colliders are considered, including CLIC, a muon collider, the High-Luminosity and High-Energy versions of the LHC, and FCC-hh. Implications on the parameter space of pNGB Dark Matter are discussed. In addition, we give improved and extended results for the collider reach on the marginal Higgs portal, under the assumption that the new scalars escape the detector, as motivated by a variety of beyond the Standard Model scenarios.

scholarly journals Rapid Bound State Formation of Dark Matter in the Early Universe

2020 ◽  
Vol 124 (16) ◽  
Author(s):  
Tobias Binder ◽  
Kyohei Mukaida ◽  
Kalliopi Petraki
Keyword(s):  
Dark Matter ◽  
Early Universe ◽  
State Formation ◽  
Bound State

scholarly journals Gravitational waves from an axion-dark photon system: A lattice study

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Wolfram Ratzinger ◽  
Pedro Schwaller ◽  
Benjamin Stefanek
Keyword(s):  
Numerical Simulation ◽  
Dark Matter ◽  
Early Universe ◽  
Degree Of Polarization ◽  
Dark Photon ◽  
System A ◽  
Precise Prediction ◽  
Relic Abundance ◽  
Vast Range ◽  
Photon Coupling

In this work, we present a lattice study of an axion - dark photon system in the early Universe and show that the stochastic gravitational wave (GW) background produced by this system may be probed by future GW experiments across a vast range of frequencies. The numerical simulation on the lattice allows us to take into account non-linear backreaction effects and enables us to accurately predict the final relic abundance of the axion or axion-like particle (ALP) as well as its inhomogeneities, and gives a more precise prediction of the GW spectrum. Importantly, we find that the GW spectrum has more power at high momenta due to 2\rightarrow12→1 processes. Furthermore, we find the degree of polarization of the peak of the GW spectrum depends on the ALP-dark photon coupling and that the polarization can be washed out or even flipped for large values thereof. In line with recent results in the literature, we find the ALP relic abundance may be suppressed by two orders of magnitude and discuss possible extensions of the model that expand the viable parameter space. Finally, we discuss the possibility to probe ultralight ALP dark matter via spectral distortions of the CMB.

scholarly journals Relic abundance of dark photon dark matter

2020 ◽  
Vol 801 ◽  
pp. 135136 ◽  
Author(s):  
Prateek Agrawal ◽  
Naoya Kitajima ◽  
Matthew Reece ◽  
Toyokazu Sekiguchi ◽  
Fuminobu Takahashi
Keyword(s):  
Dark Matter ◽  
Dark Photon ◽  
Relic Abundance

scholarly journals Dark matter and Higgs boson in a model with discrete gauge symmetry

2013 ◽  
Vol 87 (7) ◽  
Author(s):  
Cheng-Wei Chiang ◽  
Takaaki Nomura ◽  
Jusak Tandean
Keyword(s):  
Dark Matter ◽  
Higgs Boson ◽  
Gauge Symmetry

scholarly journals Light dark photon dark matter from inflation

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Yuichiro Nakai ◽  
Ryo Namba ◽  
Ziwei Wang
Keyword(s):  
Dark Matter ◽  
Photon Mass ◽  
Dark Photon ◽  
Photon Field ◽  
Relic Abundance ◽  
Large Wavelength

Abstract We discuss the possibility of producing a light dark photon dark matter through a coupling between the dark photon field and the inflaton. The dark photon with a large wavelength is efficiently produced due to the inflaton motion during inflation and becomes non-relativistic before the time of matter-radiation equality. We compute the amount of production analytically. The correct relic abundance is realized with a dark photon mass extending down to 10−21 eV.

scholarly journals Searching for lepton portal dark matter with colliders and gravitational waves

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
Jia Liu ◽  
Xiao-Ping Wang ◽  
Ke-Pan Xie
Keyword(s):  
Dark Matter ◽  
Higgs Boson ◽  
Scalar Potential ◽  
Majorana Fermion ◽  
Charged Scalar ◽  
First Order Phase Transition ◽  
Lepton Colliders ◽  
The Standard Model ◽  
Relic Abundance ◽  
First Order Phase

Abstract We study the lepton portal dark matter (DM) model in which the relic abundance is determined by the portal coupling among the Majorana fermion DM candidate χ, the singlet charged scalar mediator S± and the Standard Model (SM) right-handed lepton. The direct and indirect searches are not sensitive to this model. This article studies the lepton portal coupling as well as the scalar portal coupling (between S± and SM Higgs boson), as the latter is generally allowed in the Lagrangian. The inclusion of scalar portal coupling not only significantly enhances the LHC reach via the gg → h* → S+S− process, but also provides a few novel signal channels, such as the exotic decays and coupling devi- ations of the Higgs boson, offering new opportunities to probe the model. In addition, we also study the Drell-Yan production of S+S− at future lepton colliders, and find out that the scenario where one S± is off-shell can be used to measure the lepton portal coupling directly. In particular, we are interested in the possibility that the scalar potential triggers a first-order phase transition and hence provides the stochastic gravitational wave (GW) signals. In this case, the terrestrial collider experiments and space-based GW detectors serve as complementary approaches to probe the model.

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