Dark Matter Searches at Colliders

Boveia, A.; Doglioni, C.

doi:10.1146/annurev-nucl-101917-021008

Cited by 164 publications

(117 citation statements)

References 230 publications

(176 reference statements)

Supporting

Mentioning

116

Contrasting

Order By: Relevance

“…The weakly interacting massive particles (WIMPs) at the core of this scenario can be produced with the right abundance, and a cross section of the order expected of standard weak interaction, from an early thermal equilibrium in the radiation era. Yet, extensive direct search experiments and collider searches have significantly constrained the expected (mass and cross section) parameter space for such particles (Roszkowski et al 2018;Boveia & Doglioni 2018;Arcadi et al 2018). In addition, from the astrophysical viewpoint, WIMP-based virialized structures suffer from several 'small scale' problems; such as the cuspcore problem, the 'too big to fail' problem and the overabun- There are proposed solutions to such (very possibly related) problems in terms of baryonic physics.…”

Section: Introductionmentioning

confidence: 99%

The effect of fluctuating fuzzy axion haloes on stellar dynamics: a stochastic model

El-Zant

Freundlich

Combes

et al. 2019

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

Fuzzy dark matter of ultra-light axions has gained attention, largely in light of the galactic scale problems associated with cold dark matter. But the large de Broglie wavelength, believed to possibly alleviate these problems, also leads to fluctuations that place constraints on ultra-light axions. We adapt and extend a method, previously devised to describe the effect of gaseous fluctuations on cold dark matter cusps, in order to determine the effects of such fluctuations on classical test particles. We first evaluate the effect of fluctuations in a statistically homogeneous medium of classical particles, then in a similar system of ultra light axions. In the first case, one recovers the classical two body relaxation time, and associated diffusion coefficients, from white noise density fluctuations. In the second situation, the fluctuations are not born of discreteness noise but from the finite de Broglie wavelength; correlation therefore exists over this scale, while white noise is retained on larger scales. The resulting density power spectra and correlation functions are compared with those inferred from numerical simulations, and the relaxation time arising from the related potential fluctuations is evaluated. We then apply our results to estimate the heating of disks embedded in axion dark haloes. We find that this implies an axion mass m > ∼ 2 × 10 −22 eV. We finally apply our model to the case of the central cluster of Eridanus II, confirming that far stronger constraints on m may in principle be obtained, and discussing the limitations associated with the assumptions leading to these.

show abstract

Section: Introductionmentioning

confidence: 99%

The effect of fluctuating fuzzy axion haloes on stellar dynamics: a stochastic model

El-Zant

Freundlich

Combes

et al. 2019

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

show abstract

“…For a particle with weak scale mass and more importantly weak scale interaction with the standard model (SM) particle (O(1) pb annihilation cross section), the relic abundance Ω χ h 2 = 0.1186 [1] as the clearest measurement by far for DM arises naturally by the so-called thermal freeze-out mechanism [2]. However, current direct [3,4], indirect [5] and collider [6] searches for such a particle have substantially probed its parameter space, and the null results have reduced the motivation for this mechanism. Alternatively, freeze-in mechanism [7][8][9][10][11] can also parametrically give correct relic abundance, in which DM is not present at the very beginning, but produced through scattering with the visible sector particles (see [12] and references therein).…”

mentioning

confidence: 99%

Matter power spectrum of light freeze-in dark matter: With or without self-interaction

Huo

2020

Physics Letters B

View full text Add to dashboard Cite

We study the free-streaming effect in a light freeze-in dark matter model. Naturally in dark sector one can find dark matter related coupling, and such coupling may induce dark matter self-scattering. In case that such scattering is subdominant the dark matter partition function is not thermal but determined by the freeze-in process, yet its high momentum side is generally also Boltzmann suppressed. We show that the resultant matter power spectrum is very similar to a warm dark matter one in shape. Matching to the current Lyamn-α bound, a 20 keV freeze-in dark matter is ruled out at 2σ confidence level. In case that the dark matter self-scattering is strong and decouples at very late time, we show that the early stage Brownian motion indeed protect the power spectrum against free-streaming suppression. But such effect cannot be simply characterized by a free-streaming length alone, we find that the self-scattering decoupling time is another necessary parameter. Connecting the two limits we can obtain arbitrary matter power spectrum.

show abstract

“…Searching for a h+E miss T signature thus probes the emission of a Higgs boson from the mediator particle and thus directly the connection of the Higgs sector with a dark sector. 8,14 Such Higgs emission is possible in different models, e.g. in a type-II 2HDM model [116][117][118] with additional U(1) gauge symmetry.…”

Section: H+e Miss Tmentioning

confidence: 99%

Supersymmetry and the collider dark matter picture

Lorenz

2019

Mod. Phys. Lett. A

View full text Add to dashboard Cite

One of the key questions in particle physics and astrophysics is the nature of dark matter, which existence has been confirmed in many astrophysical and cosmological observations. Besides direct and indirect detection experiments, collider searches for dark matter offer the unique possibility to not only detect dark matter particles but in case of discovery to also study their properties by making statements about the potential underlying theory. The search program for dark matter at the ATLAS and CMS experiments at the Large Hadron Collider is comprehensive, and includes both supersymmetric dark matter candidates and other alternatives. This review presents the latest status in these searches, with special focus on supersymmetric dark matter particles. 0:49 WSPC/INSTRUCTION FILE SUSY˙DM˙collider˙3 Supersymmetry and the collider Dark Matter picture 3 in the decay of a mediator particle connecting SM and DM particles. A few example searches are illustrated in Sec. 6. A third class of models considers the direct decay of Higgs or Z bosons into DM particles (invisible Higgs-and Z boson decays). An example for searches for invisible Higgs decays is given in Sec. 7. A more extensive recent review on the non-SUSY DM searches at the LHC is given in Ref. 14. The searches, with different targets and interpretations, are complementary and provide a wide coverage of possible DM scenarios at colliders. A comparison of collider searches with DD experiments is given in Secs. 5 and 8.The LHC, ATLAS and CMS had two successful data-taking periods. In the first period (Run-1) from 2010-2012, pp-collisions at a center-of-mass energy of 7 and 8 TeV resulted in a total statistics of about 5 fb −1 at 7 TeV and 20 fb −1 at 8 TeV. After a technical stop with upgrades to the collider and detectors, pp-collisions at a center-of-mass energy of 13 TeV resumed in 2015 -2018. Due to the only recent end of this second data-taking period (Run-2) many analyses at ATLAS and CMS do not use the full dataset yet, but showed results with the partial 2015-2016 dataset amounting to about 36 fb −1 or the partial 2015-2017 dataset with about 80 fb −1 . Only recently, the first results using the full dataset of ∼ 140 fb −1 were presented by a small number of analyses. The dataset of Run-2 is significantly larger and at higher energy than the dataset in Run-1 and thus allows -as shown in the further course of this review -to perform certain searches for electroweakly produced SUSY particles for the first time at LHC experiments. Models in DM searchesDifferent models, depending on the underlying theory, are used in the design and interpretation of searches for DM particles at colliders. SupersymmetrySupersymmetry 15 introduces an additional symmetry between fermions and bosons and extends space-time symmetry. Of the different supersymmetric theories possible, only the low-energy realization of N = 1 SUSY might be accessible to present colliders. The most common considered model is the Minimal Supersymmetric Standard Model (MSSM) 16,17 which is the minimal p...

show abstract

Dark Matter Searches at Colliders

Cited by 164 publications

References 230 publications

The effect of fluctuating fuzzy axion haloes on stellar dynamics: a stochastic model

The effect of fluctuating fuzzy axion haloes on stellar dynamics: a stochastic model

Matter power spectrum of light freeze-in dark matter: With or without self-interaction

Supersymmetry and the collider dark matter picture

Contact Info

Product

Resources

About