Article
Astronomy & Astrophysics
Sukanta Dutta, Lalit Kumar Saini
Summary: This study investigates the phenomenological viability of real spin half, zero, and one dark matter candidates that interact with third-generation heavy quarks and gluons. The validity of these candidates is confirmed through constraint analysis of the corresponding Wilson coefficients and examination of the interaction between dark matter and nucleons.
Article
Astronomy & Astrophysics
N. Darvishi, M. R. Masouminia
Summary: In this study, the maximally symmetric two-Higgs doublet model (MS-2HDM) is used to investigate the signature at LHC, showing that the production of Higgs bosons through various processes aligns with the Standard Model. The presence of heavy Higgs states significantly enhances the cross section for specific production channels, indicating potential for future discoveries of this predictive extension.
Article
Physics, Multidisciplinary
Csaba Csaki, Sungwoo Hong, Gowri Kurup, Seung J. Lee, Maxim Perelstein, Wei Xue
Summary: We examine the possibility that dark matter consists of a gapped continuum and propose a continuum model to realize this idea. The model is consistent with observations and has smaller direct detection cross sections compared to ordinary models. The continuum dark matter states decay throughout the history of the Universe and are constrained by observations of cosmic microwave background. Continuum particles produced at colliders exhibit a striking cascade-decay signature.
PHYSICAL REVIEW LETTERS
(2022)
Article
Astronomy & Astrophysics
Trygve Buanes, Inaki Lara, Krzysztof Rolbiecki, Kazuki Sakurai
Summary: We revisit LHC searches for heavy invisible particles using QCD initial state radiation, specifically focusing on the electroweakino sector. By analyzing the dijet signal region in a general multijet plus MET search conducted by ATLAS, we obtain nontrivial mass limits for various models. For instance, winos must have a mass greater than mW > 160 GeV and Higgsinos must have a mass greater than mh > 100 GeV, depending on the chargino-neutralino mass splitting. Furthermore, we predict that the exclusion limits will increase to mW > 200 GeV and mh > 130 GeV for winos and Higgsinos, respectively, with the expected data from LHC Run 3 with L = 300 fb-1. This study presents the first LHC limit for promptly decaying nearly mass-degenerate winos.
Article
Physics, Nuclear
Wei Chao, Hong-Xin Wang, Lei Wang, Yang Zhang
Summary: This study investigates the capability of the LHC to test dark matter, Z', and a vector-like quark by combining the b -> s mu(+)mu(-) anomaly and dark matter observables. The findings suggest that values of m(XI) < 350 GeV and m(Z') < 450 GeV are favored by the b -> s mu(+)mu(-) anomaly and the relic abundance of dark matter, with constraints on the mass ranges of the vector-like quark. Search results from the LHC reduce the mass ranges further, requiring m(Q) to be larger than 1.7 TeV, and simulations indicate that certain benchmark points can be accessed at the 14 TeV LHC with an integrated luminosity of 3000 fb(-1).
Article
Physics, Multidisciplinary
Ernesto Arganda, Anibal D. Medina, Andres D. Perez, Alejandro Szynkman
Summary: We study simplified dark matter models and their signatures at the LHC using neural networks. By using 2D histograms instead of event-by-event arrays, we achieve better performance in distinguishing between standard model and new physics signals. Kinematic monojet features are used as input data to describe different models with a single data sample. The neural network performance is found to be independent of the simulated number of background events, providing flexibility to the method. We also discuss the network performance under incorrect assumptions about the true dark matter nature. Finally, we propose multimodel classifiers for searching and identifying new signals in a more general way for the next LHC run.
Article
Astronomy & Astrophysics
Dong-Won Jung, Kang Young Lee, Chaehyun Yu
Summary: We investigate the invisible decay of positronium to study the fermionic light dark matter mediated by the dark Z boson. The standard model predicts a very small invisible decay rate for positronium through weak interaction, making it undetectable in experiments. However, we demonstrate that this can be enhanced and observed in the future if the dark matter is lighter than the electron in the dark Z model. Additionally, we calculate the relic abundance of such light dark matter and discuss its implications on the big bang nucleosynthesis under an alternative thermal history scenario.
Article
Astronomy & Astrophysics
Mingxuan Du, Rundong Fang, Zuowei Liu, Van Que Tran
Summary: This study investigates the parameter space of a new dark photon model using different detectors, and finds that the accessible space is significantly enlarged by the hidden radiation process.
Article
Astronomy & Astrophysics
Ernesto Arganda, Antonio Delgado, Roberto A. Morales, Mariano Quiros
Summary: In this study, a novel supersymmetric signal with gluinos decaying into jets and bino-like neutralino is analyzed at the LHC. The signal involves four light jets, four b-jets, and a significant amount of missing transverse energy. Backgrounds such as top quark pairs, V + jets, and top quark pairs with additional electroweak boson productions are identified as challenging, but prospects for discovery at high luminosity phases of the LHC are promising.
Article
Astronomy & Astrophysics
Alexander Belyaev, Stefan Prestel, Felipe Rojas-Abatte, Jose Zurita
Summary: This study reinterprets the latest ATLAS disappearing track search for a range of dark matter multiplets with different spins and electroweak quantum numbers, finding that the disappearing track signature can probe a vast portion of the parameter space. The results provide upper limits on the cross section and efficiencies in the lifetime-dark matter mass plane for all considered models, demonstrating the potential for easy recasting for similar classes of models. The recasting code employed in the study is also provided as part of the public LLP recasting repository.
Article
Physics, Particles & Fields
T. Alanne, F. Bishara, J. Fiaschi, O. Fischer, M. Gorbahn, U. Moldanazarova
Summary: In this study, the direct-detection rate for axial-vectorial dark matter scattering off nuclei is investigated in an SU(2) x U(1) invariant effective theory and compared to the reach of the LHC. The study finds regions in the parameter space where the detection rates can be suppressed and constructs consistent UV models to generate the relevant effective theory. Constraints from both collider and direct-detection experiments on the same parameter space are discussed. A benchmark scenario is found where the LHC constraints have a greater sensitivity to the mediator mass, even for the future XENONnT experiment.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Review
Astronomy & Astrophysics
J. M. Butterworth, X. Kong, M. Thomas, L. Corpe, S. Kulkarni
Summary: This paper presents the sensitivity of LHC differential cross-section measurements to stealth dark matter scenarios, including an SUoND thorn dark gauge group, the Standard Model, and dark matter. The impact of LHC measurements on dark meson masses is evaluated, and the connection between LHC explorations and dark matter phenomenology, particularly direct-detection experiments, is discussed.
Article
Astronomy & Astrophysics
Raymundo Ramos, Tzu-Chiang Yuan, Van Que Tran
Summary: The study investigates a non-Abelian vector dark matter candidate W' in the MeV-GeV low mass range, accompanied by a dark photon A' and a dark Z' in a gauged two-Higgs-doublet model. The viable parameter space suggests the importance of a dark photon in direct detection of dark matter, while a dark Z' can dominate the relic density due to resonant annihilation. The model can be further probed in the near future by sub-GeV dark matter and dark photon experiments.
Article
Physics, Multidisciplinary
Martin Bauer, Patrick Foldenauer, Peter Reimitz, Tilman Plehn
Summary: We systematically study models with light scalar and pseudoscalar dark matter candidates and their potential signals at the LHC. By deriving cosmological bounds and studying processes inspired by indirect and direct detection processes, we find that LHC can observe very light dark matter over a huge mass range if it is produced in mediator decays and then scatters with the detector material to generate jets in the nuclear recoil.
Article
Physics, Particles & Fields
Sebastian Baum, Marcela Carena, Tong Ou, Duncan Rocha, Nausheen R. Shah, Carlos E. M. Wagner
Summary: This article discusses the possibility of explaining both dark matter and the observed value of the muon's magnetic dipole moment, and proposes a method to detect this phenomenon using the LHC.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
