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Auteur : Grafiati
Publié le 7 septembre 2023

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1

Kahlhoefer, Felix. « Review of LHC dark matter searches ». International Journal of Modern Physics A 32, no 13 (5 mai 2017) : 1730006. http://dx.doi.org/10.1142/s0217751x1730006x.

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This review discusses both experimental and theoretical aspects of searches for dark matter at the LHC. An overview of the various experimental search channels is given, followed by a summary of the different theoretical approaches for predicting dark matter signals. A special emphasis is placed on the interplay between LHC dark matter searches and other kinds of dark matter experiments, as well as among different types of LHC searches.
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Behr, J. Katharina, et Alexander Grohsjean. « Dark Matter Searches with Top Quarks ». Universe 9, no 1 (27 décembre 2022) : 16. http://dx.doi.org/10.3390/universe9010016.

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Collider signatures with top quarks provide sensitive probes of dark matter (DM) production at the Large Hadron Collider (LHC). In this article, we review the results of DM searches in final states with top quarks conducted by the ATLAS and CMS Collaborations at the LHC, including the most recent results on the full LHC Run 2 dataset. We highlight the complementarity of DM searches in final states with top quarks with searches in other final states in the framework of various simplified models of DM. A reinterpretation of a DM search with top quarks in the context of an effective field theory description of scalar dark energy is also discussed. Finally, we give an outlook on the potential of DM searches with top quarks in LHC Run 3, at the high-luminosity LHC, and possible future colliders. In this context, we highlight new benchmark models that could be probed by existing and future searches as well as those that predict still-uncovered signatures of anomalous top-quark production and decays at the LHC.
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3

Mitsou, Vasiliki A. « Dark matter searches at LHC ». Journal of Physics : Conference Series 335 (28 décembre 2011) : 012003. http://dx.doi.org/10.1088/1742-6596/335/1/012003.

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4

Boveia, Antonio, et Caterina Doglioni. « Dark Matter Searches at Colliders ». Annual Review of Nuclear and Particle Science 68, no 1 (19 octobre 2018) : 429–59. http://dx.doi.org/10.1146/annurev-nucl-101917-021008.

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Colliders, among the most successful tools of particle physics, have revealed much about matter. This review describes how colliders contribute to the search for particle dark matter, focusing on the highest-energy collider currently in operation, the Large Hadron Collider (LHC) at CERN. In the absence of hints about the character of interactions between dark matter and standard matter, this review emphasizes what could be observed in the near future, presents the main experimental challenges, and discusses how collider searches fit into the broader field of dark matter searches. Finally, it highlights a few areas to watch for the future LHC program.
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5

Feng, Jingxuan. « Different Detection Methods for Dark Matter ». Theoretical and Natural Science 5, no 1 (25 mai 2023) : 268–74. http://dx.doi.org/10.54254/2753-8818/5/20230452.

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Dark matter has been proposed to fulfill the missing mass from Astro-observation. Many theories have been raised to explain dark matter, and weakly interacting massive particles (WIMPs) are one of them. In recent decades, dark matter detection sensitivity has improved significantly. However, solid evidence for their existence has not come yet. This paper outlines some methods for detecting dark matter, including direct detections, collider searches with the ATLAS detector at LHC, and collider searches with CEPC.
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6

Askew, Andrew, Sushil Chauhan, Björn Penning, William Shepherd et Mani Tripathi. « Searching for dark matter at hadron colliders ». International Journal of Modern Physics A 29, no 23 (16 septembre 2014) : 1430041. http://dx.doi.org/10.1142/s0217751x14300415.

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Theoretical and experimental techniques employed in dedicated searches for dark matter at hadron colliders are reviewed. Bounds from the 7 TeV and 8 TeV proton–proton collisions at the Large Hadron Collider (LHC) on dark matter interactions have been collected and the results interpreted. We review the current status of the Effective Field Theory picture of dark matter interactions with the Standard Model. Currently, LHC experiments have stronger bounds on operators leading to spin-dependent scattering than direct detection experiments, while direct detection probes are more constraining for spin-independent scattering for WIMP masses above a few GeV.
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7

Mitsou, Vasiliki A. « Overview of searches for dark matter at the LHC ». Journal of Physics : Conference Series 651 (3 novembre 2015) : 012023. http://dx.doi.org/10.1088/1742-6596/651/1/012023.

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8

Djouadi, Abdelhak, Oleg Lebedev, Yann Mambrini et Jérémie Quevillon. « Implications of LHC searches for Higgs-portal dark matter ». Physics Letters B 709, no 1-2 (mars 2012) : 65–69. http://dx.doi.org/10.1016/j.physletb.2012.01.062.

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9

Pozzo, Giancarlo, et Yang Zhang. « Constraining resonant dark matter with combined LHC electroweakino searches ». Physics Letters B 789 (février 2019) : 582–91. http://dx.doi.org/10.1016/j.physletb.2018.12.062.

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10

Abdallah, Jalal, Henrique Araujo, Alexandre Arbey, Adi Ashkenazi, Alexander Belyaev, Joshua Berger, Celine Boehm et al. « Simplified models for dark matter searches at the LHC ». Physics of the Dark Universe 9-10 (septembre 2015) : 8–23. http://dx.doi.org/10.1016/j.dark.2015.08.001.

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11

Guescini, Francesco. « Searches for new phenomena with the ATLAS detector ». International Journal of Modern Physics A 35, no 34n35 (18 décembre 2020) : 2044005. http://dx.doi.org/10.1142/s0217751x20440054.

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Many theories beyond the Standard Model predict new phenomena accessible by the Lhc. Searches for new physics are performed using the Atlas experiment at the Lhc focusing on exotic signatures that are predicted in several theories, excluding supersymmetry. The results of recent searches using 13 TeV data, with the exception of those for Dark Matter signatures, and their interplay and interpretation are presented. Prospects for searches at the High Luminosity Lhc are also discussed.
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12

Chen, Chuan-Ren, et Ming-Jie Li. « New LUX result constrains exotic quark mediators with the vector dark matter ». International Journal of Modern Physics A 31, no 36 (28 décembre 2016) : 1650200. http://dx.doi.org/10.1142/s0217751x16502006.

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The scenario of the compressed mass spectrum between heavy quark and dark matter is a challenge for LHC searches. However, the elastic scattering cross-section between dark matter and nuclei in dark matter direct detection experiments can be enhanced with nearly degenerate masses between heavy quarks and dark matter. In this paper, we illustrate such scenario with a vector dark matter, using the latest result from LUX 2016. The mass constraints on heavy quarks can be more stringent than current limits from LHC, unless the coupling strength is very small. However, the compress mass spectrum with allowed tiny coupling strength makes the decay lifetime of heavy quarks longer than the timescale of QCD hadronization.
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13

Arbey, Alexandre, et Farvah Mahmoudi. « Interplay of LHC and dark matter searches in the MSSM ». Cogent Physics 2, no 1 (24 juillet 2015) : 1064575. http://dx.doi.org/10.1080/23311940.2015.1064575.

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14

Khlopov, M. Yu, et R. M. Shibaev. « Probes for 4th Generation Constituents of Dark Atoms in Higgs Boson Studies at the LHC ». Advances in High Energy Physics 2014 (2014) : 1–7. http://dx.doi.org/10.1155/2014/406458.

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The nonbaryonic dark matter of the Universe can consist of new stable charged species, bound in heavy neutral “atoms” by ordinary Coulomb interaction. StableU-(anti-U)quarks of 4th generation, bound in stable colorless(U- U- U-)clusters, are captured by the primordial helium, produced in Big Bang Nucleosynthesis, thus forming neutral “atoms” of O-helium (OHe), a specific nuclear interacting dark matter that can provide solution for the puzzles of direct dark matter searches. However, the existence of the 4th generation quarks and leptons should influence the production and decay rates of Higgs boson and is ruled out by the experimental results of the Higgs boson searches at the LHC, if the Higgs boson coupling to 4th generation fermions is not suppressed. Here, we argue that the difference between the three known quark-lepton families and the 4th family can naturally lead to suppression of this coupling, relating the accelerator test for such a composite dark matter scenario to the detailed study of the production and modes of decay of the 125.5 GeV boson, discovered at the LHC.
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15

AKULA, SUJEET, DANIEL FELDMAN, ZUOWEI LIU, PRAN NATH et GREGORY PEIM. « NEW CONSTRAINTS ON DARK MATTER FROM CMS AND ATLAS DATA ». Modern Physics Letters A 26, no 21 (10 juillet 2011) : 1521–35. http://dx.doi.org/10.1142/s0217732311036292.

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Constraints on dark matter from the first CMS and ATLAS SUSY searches are investigated. It is shown that within the minimal supergravity model, the early search for supersymmetry at the LHC has depleted a large portion of the signature space in dark matter direct detection experiments. In particular, the prospects for detecting signals of dark matter in the XENON and CDMS experiments are significantly affected in the low neutralino mass region. Here the relic density of dark matter typically arises from slepton coannihilations in the early universe. In contrast, it is found that the CMS and ATLAS analyses leave untouched the Higgs pole and the Hyperbolic Branch/Focus Point regions, which are now being probed by the most recent XENON results. Analysis is also done for supergravity models with non-universal soft breaking where one finds that a part of the dark matter signature space depleted by the CMS and ATLAS cuts in the minimal SUGRA case is repopulated. Thus, observation of dark matter in the LHC depleted region of minimal supergravity may indicate non-universalities in soft breaking.
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16

Dutta, Bhaskar, et Louis E. Strigari. « Neutrino Physics with Dark Matter Detectors ». Annual Review of Nuclear and Particle Science 69, no 1 (19 octobre 2019) : 137–61. http://dx.doi.org/10.1146/annurev-nucl-101918-023450.

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Direct dark matter detection experiments will soon be sensitive to neutrinos from astrophysical sources, including the Sun, the atmosphere, and supernovae, which will set an important benchmark and open a new window into neutrino physics and astrophysics. The detection of these neutrinos will be complementary to accelerator- and reactor-based experiments that study neutrinos over the same energy range. We review the physics and astrophysics that can be extracted from the detection of these neutrinos, highlighting the potential of identifying New Physics in the form of light mediators that arise from kinetic mixing and hidden sectors, as well as ∼eV-scale sterile neutrinos. We discuss how the physics reach of these experiments will complement searches for New Physics at the LHC and dedicated neutrino experiments.
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17

Eifert, T. « Searches for Supersymmetry at the LHC and its Dark Matter Candidate ». EAS Publications Series 36 (2009) : 203–9. http://dx.doi.org/10.1051/eas/0936029.

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18

Alves, Alexandre, F. de Campos, M. Dias et J. M. Hoff da Silva. « Searching for Elko dark matter spinors at the CERN LHC ». International Journal of Modern Physics A 30, no 01 (9 janvier 2015) : 1550006. http://dx.doi.org/10.1142/s0217751x15500062.

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The aim of this paper is to explore the possibility of discovering a fermionic field with mass dimension one, the Elko field, in the Large Hadron Collider. Due to its mass dimension, an Elko can only interact either with Standard Model spinors and gauge fields at one-loop order or at tree level through a quartic interaction with the Higgs field. In this Higgs portal scenario, the Elko is a viable candidate to a dark matter constituent which has been shown to be compatible with relic abundance measurements from WMAP and direct dark matter searches. We propose a search strategy for this dark matter candidate in the channel [Formula: see text] at the [Formula: see text] LHC. We show the LHC potential to discover the Elko considering a triple Higgs–Elkos coupling as small as ~0.5 after 1 ab-1 of integrated luminosity. Some phenomenological consequences of this new particle and its collider signatures are also discussed.
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19

KHLOPOV, MAXIM YU. « PHYSICS OF DARK MATTER IN THE LIGHT OF DARK ATOMS ». Modern Physics Letters A 26, no 38 (14 décembre 2011) : 2823–39. http://dx.doi.org/10.1142/s0217732311037194.

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Direct searches for dark matter lead to serious problems for simple models with stable neutral Weakly Interacting Massive Particles (WIMPs) as candidates for dark matter. A possibility is discussed that new stable quarks and charged leptons exist and are hidden from detection, being bound in neutral dark atoms of composite dark matter. Stable -2 charged particles O -- are bound with primordial helium in O-helium (OHe) atoms, being specific nuclear interacting form of composite Warmer than Cold dark matter. Slowed down in the terrestrial matter, OHe is elusive for direct methods of underground dark matter detection based on the search for effects of nuclear recoil in WIMP-nucleus collisions. The positive results of DAMA experiments can be explained as annual modulation of radiative capture of O-helium by nuclei. In the framework of this approach, test of DAMA results in detectors with other chemical content becomes a nontrivial task, while the experimental search of stable charged particles at LHC or in cosmic rays acquires a meaning of direct test for composite dark matter scenario.
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20

Auriemma, Giulio. « LHC, Astrophysics and Cosmology ». Acta Polytechnica CTU Proceedings 1, no 1 (4 décembre 2014) : 42–48. http://dx.doi.org/10.14311/app.2014.01.0042.

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In this paper we discuss the impact on cosmology of recent results obtained by the LHC (Large Hadron Collider) experiments in the 2011-2012 runs, respectively at √<span style="text-decoration: overline;">s</span> = 7 and 8 TeV. The capital achievement of LHC in this period has been the discovery of a spin-0 particle with mass 126 GeV/c<sup>2</sup>, very similar to the Higgs boson of the Standard Model of Particle Physics. Less exciting, but not less important, negative results of searches for Supersymmetric particles or other exotica in direct production or rare decays are discussed in connection with particles and V.H.E. astronomy searches for Dark Matter.
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21

Alwall, Johan, et Jusak Tandean. « Heavy Chiral Fermions and Dark Matter ». Advances in High Energy Physics 2013 (2013) : 1–15. http://dx.doi.org/10.1155/2013/915897.

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Dark matter presents perhaps one of the most compelling direct indications of new physics beyond the standard model with three generations of fermions. In this paper, we survey several scenarios for dark matter in association with a fourth generation of chiral matter. The surveyed scenarios include stable heavy neutrino dark matter, composite dark matter consisting of stable heavy quarks, heavy quarks as mediators between the dark and visible sectors, and the four-generation standard model with the minimal addition of a stable real scalar field. We discuss the basic properties of the models, direct search constraints on their dark matter, and their collider phenomenology, as well as the possible effects of dark matter on the searches for a Higgs boson in the presence of four generations. We also comment on the potential implication of the recent observation of a Higgs-like new particle at the LHC.
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22

HE, XIAO-GANG, TONG LI, XUE-QIAN LI, JUSAK TANDEAN et HO-CHIN TSAI. « CONSTRAINTS ON SCALAR DARK MATTER FROM DIRECT EXPERIMENTAL SEARCHES ». International Journal of Modern Physics : Conference Series 01 (janvier 2011) : 257–65. http://dx.doi.org/10.1142/s2010194511000377.

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The standard model (SM) plus a real gauge-singlet scalar field dubbed darkon (SM+D) is the simplest model possessing a weakly interacting massive particle (WIMP) dark-matter candidate. The upper limits for the WIMP-nucleon elastic cross-section as a function of WIMP mass from the recent XENON10 and CDMS II experiments rule out darkon mass ranges from 10 to (50, 70, 75) GeV for Higgs-boson masses of (120, 200, 350) GeV, respectively. This may exclude the possibility of the darkon providing an explanation for the gamma-ray excess observed in the EGRET data. We show that by extending the SM+D to a two-Higgs-doublet model plus a darkon the experimental constraints on the WIMP-nucleon interactions can be circumvented due to suppression occurring at some values of the product tan α tan β, with α being the neutral-Higgs mixing angle and tan β the ratio of vacuum expectation values of the Higgs doublets. We also comment on the implication of the darkon model for Higgs searches at the LHC.
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23

FARZAN, Y. « STRATEGIES TO LINK TINY NEUTRINO MASSES WITH HUGE MISSING MASS OF THE UNIVERSE ». International Journal of Modern Physics A 26, no 15 (20 juin 2011) : 2461–85. http://dx.doi.org/10.1142/s0217751x11053572.

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With the start of the LHC, interest in electroweak scale models for the neutrino mass has grown. In this paper, we review two specific models that simultaneously explain neutrino masses and provide a suitable DM candidate. We discuss the implications of these models for various observations and experiments including the LHC, Lepton Flavor Violating (LFV) rare decays, direct and indirect dark matter searches and kaon decay.
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24

Lagouri, Theodota. « Review on Higgs Hidden–Dark Sector Physics at High-Energy Colliders ». Symmetry 14, no 7 (22 juin 2022) : 1299. http://dx.doi.org/10.3390/sym14071299.

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The presence of a hidden or dark sector of phenomena that relates either weakly or in a particular way to Standard Model (SM) fields has theoretical as well as experimental support. Many extensions of SM use hidden or dark sector states to propose a specific candidate for dark matter (DM) in the universe or to explain astrophysical findings. If such a family of Beyond the Standard Model (BSM) particles and interactions exists, it is possible that they will be discovered experimentally at CERN’s Large Hadron Collider (LHC, √s≅14 TeV) and future High Energy Colliders. The primary emphasis is on a few examples of searches undertaken at the LHC that are relevant to Higgs Hidden–Dark Sector Physics. These studies’ existing constraints and prospects are also reported.
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ROSZKOWSKI, LESZEK, ENRICO MARIA SESSOLO et YUE-LIN SMING TSAI. « BAYESIAN IMPLICATIONS OF COLLIDER AND SUSY DARK MATTER DIRECT AND INDIRECT SEARCHES ». Modern Physics Letters A 28, no 02 (20 janvier 2013) : 1340008. http://dx.doi.org/10.1142/s0217732313400087.

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In this talk we present our recent Bayesian analyses of the Constrained MSSM in which the model's parameter space is constrained by the CMS αT 1.1/fb data at the LHC, the XENON100 dark matter direct detection data, and Fermi-LAT γ-ray data from dwarf spheroidal galaxies (dSphs). We also show that the projected one-year sensitivities for annihilation-induced neutrinos from the Sun in the 86-string configuration of IceCube/DeepCore have the potential to yield additional constraining power on the parameter space of the CMSSM.
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26

Abercrombie, Daniel, Nural Akchurin, Ece Akilli, Juan Alcaraz Maestre, Brandon Allen, Barbara Alvarez Gonzalez, Jeremy Andrea et al. « Dark Matter benchmark models for early LHC Run-2 Searches : Report of the ATLAS/CMS Dark Matter Forum ». Physics of the Dark Universe 27 (janvier 2020) : 100371. http://dx.doi.org/10.1016/j.dark.2019.100371.

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27

Abu-Ajamieh, Fayez. « The radion as a dark matter candidate ». International Journal of Modern Physics A 33, no 24 (30 août 2018) : 1850144. http://dx.doi.org/10.1142/s0217751x18501440.

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I study a class of Randall–Sundrum (RS) models with Spontaneous Breaking of Scale Invariance (SBSI). This class of models implements the Contino–Pomarol–Rattazzi (CPR) mechanism to achieve SBSI through the small running of an external close-to-marginal scale-breaking operator that leads to a light dilaton/radion with couplings to matter suppressed by the small running. I show that for radion masses [Formula: see text] KeV, it can serve as a dark matter (DM) candidate, with a lifetime longer than the age of the universe, and show that the experimental bounds from LHC, non-Newtonian gravity and Axion-Like Particle (ALP) searches allow for the existence of such a radion. In spite of the small relic abundance of the light radion produced in this model, we show that it could be possible to obtain the required abundance through additional assumptions, an issue we postpone to the future.
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28

Martínez, Mario. « Search for Dark Matter at the LHC ». Journal of Physics : Conference Series 460 (4 octobre 2013) : 012001. http://dx.doi.org/10.1088/1742-6596/460/1/012001.

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Kowalska, Kamila, et Enrico Maria Sessolo. « The Discreet Charm of Higgsino Dark Matter : A Pocket Review ». Advances in High Energy Physics 2018 (11 juillet 2018) : 1–15. http://dx.doi.org/10.1155/2018/6828560.

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We give a brief review of the current constraints and prospects for detection of higgsino dark matter in low-scale supersymmetry. In the first part we argue, after performing a survey of all potential dark matter particles in the MSSM, that the (nearly) pure higgsino is the only candidate emerging virtually unscathed from the wealth of observational data of recent years. In doing so by virtue of its gauge quantum numbers and electroweak symmetry breaking only, it maintains at the same time a relatively high degree of model-independence. In the second part we properly review the prospects for detection of a higgsino-like neutralino in direct underground dark matter searches, collider searches, and indirect astrophysical signals. We provide estimates for the typical scale of the superpartners and fine tuning in the context of traditional scenarios where the breaking of supersymmetry is mediated at about the scale of Grand Unification and where strong expectations for a timely detection of higgsinos in underground detectors are closely related to the measured 125 GeV mass of the Higgs boson at the LHC.
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Lagouri, Theodota. « Review on Higgs hidden-dark sector physics ». Physica Scripta 97, no 2 (13 janvier 2022) : 024001. http://dx.doi.org/10.1088/1402-4896/ac42a6.

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Abstract The Standard Model (SM), while extremely powerful as a description of the strong, electromagnetic and weak interactions, does not provide a natural candidate to explain Dark Matter (DM). Theoretical as well as experimental motivation exists for the existence of a hidden or dark sector of phenomena that couples either weakly or in a special way to SM fields. Hidden sector or dark sector states appear in many extensions to SM to provide a particular candidate DM in the universe or to explain astrophysical observations. If there is such a family of Beyond the Standard Model (BSM) particles and interactions, they may be accessible experimentally at the Large Hadron Collider (LHC) at CERN and at future High Energy Colliders. In this paper, the main focus is given on selected searches conducted at LHC experiments related to Higgs Hidden-Dark Sector Physics. The current constraints and future prospects of these studies are summarized.
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Biswas, Sanjoy, Emidio Gabrielli et Barbara Mele. « Dark Photon Searches via Higgs Boson Production at the LHC and Beyond ». Symmetry 14, no 8 (26 juillet 2022) : 1522. http://dx.doi.org/10.3390/sym14081522.

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Many scenarios beyond the standard model, aiming to solve long-standing cosmological and particle physics problems, suggest that dark matter might experience long-distance interactions mediated by an unbroken dark U(1) gauge symmetry, hence foreseeing the existence of a massless dark photon. Contrary to the massive dark photon, a massless dark photon can only couple to the standard model sector by means of effective higher dimensional operators. Massless dark photon production at colliders will then in general be suppressed at low energy by a UV energy scale, which is of the order of the masses of portal (messenger) fields connecting the dark and the observable sectors. A violation of this expectation is provided by dark photon production mediated by the Higgs boson, thanks to the non-decoupling Higgs properties. Higgs boson production at colliders, followed by the Higgs decay into a photon and a dark photon, provides then a very promising production mechanism for the dark photon discovery, being insensitive in particular regimes to the UV scale of the new physics. This decay channel gives rise to a peculiar signature characterized by a monochromatic photon with energy half the Higgs mass (in the Higgs rest frame) plus missing energy. We show how such resonant photon-plus-missing-energy signature can uniquely be connected to a dark photon production. Higgs boson production and decay into a photon and a dark photon as a source of dark photons is reviewed at the Large Hadron Collider, in light of the present bounds on the corresponding signature by the CMS and ATLAS collaborations. Perspectives for the dark photon production in Higgs-mediated processes at future e+e− colliders are also discussed.
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32

Echenard, Bertrand. « Search for Light New Physics atBFactories ». Advances in High Energy Physics 2012 (2012) : 1–13. http://dx.doi.org/10.1155/2012/514014.

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Many extensions of the Standard Model include the possibility of light new particles, such as light Higgs bosons or dark matter candidates. These scenarios can be probed using the large datasets collected byBfactories, complementing measurements performed at the LHC. This paper summarizes recent searches for light new physics conducted by theBABARand Belle experiments.
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33

Kahlhoefer, Felix. « Thermal WIMPs and the scale of new physics ». Journal of Physics : Conference Series 2156, no 1 (1 décembre 2021) : 012066. http://dx.doi.org/10.1088/1742-6596/2156/1/012066.

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Abstract The non-observation of conclusive dark matter signals raises the question whether WIMPs can still account for the dark matter of the universe. In this talk I will present results from a global analysis of effective field theory operators describing the interactions between WIMPs and Standard Model particles. In this bottom-up approach, the global fitting framework GAMBIT is used to simultaneously vary the coefficients of 14 such operators, along with the WIMP mass, the scale of new physics and several nuisance parameters. The likelihood functions include the latest data from Planck, direct and indirect detection experiments, and the LHC. Although the observed relic density can be reproduced in large regions of parameter space, there cannot be a large hierarchy between the dark matter mass and the scale of new physics, which raises concerns about the validity of the effective field theory. I will discuss possible ways to address this issue in order to consistently interpret the latest results from WIMP searches at the LHC.
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34

Ellis, John. « Particle physics today, tomorrow and beyond ». International Journal of Modern Physics A 33, no 02 (20 janvier 2018) : 1830003. http://dx.doi.org/10.1142/s0217751x1830003x.

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The most important discovery in particle physics in recent years was that of the Higgs boson, and much effort is continuing to measure its properties, which agree obstinately with the Standard Model, so far. However, there are many reasons to expect physics beyond the Standard Model, motivated by the stability of the electroweak vacuum, the existence of dark matter and the origin of the visible matter in the Universe, neutrino physics, the hierarchy of mass scales in physics, cosmological inflation and the need for a quantum theory for gravity. Most of these issues are being addressed by the experiments during Run 2 of the LHC, and supersymmetry could help resolve many of them. In addition to the prospects for the LHC, I also review briefly those for direct searches for dark matter and possible future colliders.
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35

Bossi, Hannah, et Shreyashi Chakdar. « A Symmetric Two Higgs Doublet Model ». Journal of Nepal Physical Society 7, no 3 (31 décembre 2021) : 34–40. http://dx.doi.org/10.3126/jnphyssoc.v7i3.42189.

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In the light of ongoing experimental search efforts for the dark matter and the post-Higgs Beyond the Standard Model (BSM) null results at the Large Hadron Collider (LHC), the Electroweak sector demands to be investigated for possible new scalar states discoverable at the LHC fulfilling the role of the dark matter. In this work we present a symmetric two Higgs doublet model with a discrete interchange symmetry among the two Higgs doublets (Φ1 ↔ Φ2). Apart from the Standard Model (SM)-like scalar state (h) with mh = 125 GeV, the model has several distinguishing features including the pseudoscalar (A), the charged scalars(H±) and the neutral scalar H, not having any direct coupling to the fermions. The neutral scalar H is assumed to have mass lighter than the 125 GeV SM-like Higgs state h. Due to the presence of a residual Z2 symmetry after the spontaneous symmetry breaking (SSB), the neutral scalar H can emerge as a viable dark matter candidate. We discuss the constraints on such scalar dark matter from the current direct and indirect detection experiments. As a by-product of this construction, the SM-like scalar h ends up having an extra invisible decay mode of h → HH in this model which can also influence the dark matter parameter space. We discuss these model features in detail along with a guideline of relevant phenomenological searches at the LHC for this scenario.
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36

Aguilar-Saavedra, J. A., D. E. López-Fogliani, C. Muñoz et M. Pierre. « WIMP dark matter in the UμνSSM ». Journal of Cosmology and Astroparticle Physics 2022, no 05 (1 mai 2022) : 004. http://dx.doi.org/10.1088/1475-7516/2022/05/004.

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Abstract The UμνSSM is a U(1)' extension of the μνSSM supersymmetric model, where baryon-number-violating operators as well as explicit mass terms are forbidden, and the potential domain wall problem is avoided. The gauge anomaly-cancellation conditions impose the presence of exotic quark superfields in the spectrum of UμνSSM models, and allow the presence of several singlet superfields under the standard model gauge group, in addition to the right-handed neutrino superfields. The gauge structure implies an additional discrete Z 2 symmetry in the superpotential, ensuring the stability of a singlet which behaves as WIMP dark matter without invoking R-parity. We analyze this novel possibility in detail, using the fermionic component of the singlet as the dark matter candidate. In particular, we compute its amount of relic density via Z', Higgs-right sneutrino and dark matter mediated annihilations, and its potential signals in dark matter direct detection experiments. The constraints on the parameter space due to Z'; direct searches at the LHC are imposed in the analysis, as well as those from the hadronization inside the detector of the exotic quarks. Large regions of the parameter space turn out to be in the reach of the upcoming Darwin experiment.
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37

Kamada, Ayuki, et Takumi Kuwahara. « LHC lifetime frontier and visible decay searches in composite asymmetric dark matter models ». Journal of High Energy Physics 2022, no 3 (mars 2022). http://dx.doi.org/10.1007/jhep03(2022)176.

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Abstract The LHC lifetime frontier will probe dark sector in near future, and the visible decay searches at fixed-target experiments have been exploring dark sector. Composite asymmetric dark matter with dark photon portal is a promising framework explaining the coincidence problem between dark matter and visible matter. Dark strong dynamics provides rich structure in the dark sector: the lightest dark nucleon is the dark matter, while strong annihilation into dark pions depletes the symmetric components of the dark matter. Dark photons alleviate cosmological problems. Meanwhile, dark photons make dark hadrons long-lived in terrestrial experiments. Moreover, the dark hadrons are produced through the very same dark photon. In this study, we discuss the visible decay searches for composite asymmetric dark matter models. For a few GeV dark nucleons, the LHC lifetime frontier, MATHUSLA and FASER, has a potential to discover their decay when kinetic mixing angle of dark photon is ϵ ≳ 10−4. On the other hand, fixed-target experiments, in particular SeaQuest, will have a great sensitivity to dark pions with a mass below GeV and with kinetic mixing ϵ ≳ 10−4 in addition to the LHC lifetime frontier. These projected sensitivities to dark hadrons in dark photon parameter space are comparable with the future sensitivities of dark photon searches, such as Belle-II and LHCb.
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38

Frattari, Guglielmo. « Dark Matter searches with the ATLAS Detector ». SciPost Physics Proceedings, no 8 (13 juillet 2022). http://dx.doi.org/10.21468/scipostphysproc.8.085.

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The presence of a non-baryonic dark matter (DM) component in the Universe is inferred from the observation of its gravitational interaction. If dark matter interacts weakly with the Standard Model (SM) it could be produced at the LHC. The ATLAS experiment has developed a broad search program for DM candidates, including resonance searches for the mediator which would couple DM to the SM. The results of recent searches on 13 TeV pp data, their interplay and interpretation will be presented. Prospects for HL-LHC will also be discussed.
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39

Kuwahara, Takumi, et Shu-Run Yuan. « Dark vector mesons at LHC forward detector searches ». Journal of High Energy Physics 2023, no 6 (30 juin 2023). http://dx.doi.org/10.1007/jhep06(2023)208.

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Abstract Confining gauge dynamics in a dark sector is promising to provide dark matter with a mass in the range of sub-GeV to GeV. Such dark sectors consist of composite particles such as dark baryons and dark mesons, that are neutral under the standard-model charge. A dark photon is introduced as a portal matter between the dark sector and the standard-model sector to alleviate cosmological problems (e.g., to maintain kinetic equilibrium between two sectors or to reduce the light dark-sector particles contributing to the dark radiation), and dark hadrons are produced through the same dark photon at accelerator-based experiments. As dark vector mesons and dark pions have similar masses, dark vector mesons can be long-lived particles, which will be explored by far-detector experiments. We study the future prospects of the LHC forward-detector experiments, FASER/FASER2 and FACET, for exploring the dark vector mesons. When the dark photon is heavier than the dark pions, the LHC forward-detector searches will be comparable to DarkQuest, and the invisible decay searches of dark photons will also explore the same parameter space. Meanwhile, when dark photons are lightest in the dark sector, their future prospects will be comparable to the visible decay searches for dark photons at LHCb, Belle-II, and HPS.
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40

Iguro, Syuhei, Shohei Okawa et Yuji Omura. « Light lepton portal dark matter meets the LHC ». Journal of High Energy Physics 2023, no 3 (1 mars 2023). http://dx.doi.org/10.1007/jhep03(2023)010.

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Abstract We examine the sensitivity of the Large Hadron Collider (LHC) to light lepton portal dark matter with its mass below 10 GeV. The model features an extra doublet scalar field and singlet Dirac dark matter, which have Yukawa interactions with left-handed leptons. To correctly produce the dark matter abundance via the thermal freeze-out, a large mass splitting among the extra scalars is required, thus providing a light neutral scalar below $$ \mathcal{O}(10)\textrm{GeV} $$ O 10 GeV and heavy neutral and charged scalars at the electroweak scale. In this paper, we focus on the electroweak pair-production of the extra scalars with subsequent model-specific scalar decays and evaluate the current constraints with the LHC Run 2 data and the discovery potential at the High Luminosity LHC (HL-LHC). It turns out that a large part of the theoretically allowed parameter space can be tested at the HL-LHC by taking into account complementarity between slepton searches and mono-Z plus missing transverse energy search. We also discuss same-sign charged scalar production as a unique prediction of the model, and the implication of the collider searches in the thermal dark matter scenario.
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41

De Simone, Andrea, Gian Francesco Giudice et Alessandro Strumia. « Benchmarks for dark matter searches at the LHC ». Journal of High Energy Physics 2014, no 6 (juin 2014). http://dx.doi.org/10.1007/jhep06(2014)081.

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42

Baer, Howard, Vernon Barger, Peisi Huang et Xerxes Tata. « Natural supersymmetry : LHC, dark matter and ILC searches ». Journal of High Energy Physics 2012, no 5 (mai 2012). http://dx.doi.org/10.1007/jhep05(2012)109.

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43

von Ahnen, Janik. « Dark Sector searches with jets ». SciPost Physics Proceedings, no 10 (11 août 2022). http://dx.doi.org/10.21468/scipostphysproc.10.029.

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The presence of a non-baryonic Dark Matter (DM) component in the Universe is inferred from the observation of its gravitational interaction. The ATLAS and CMS experiments located at the LHC have developed a broad search program for DM candidates, including resonance searches for the mediator and searches with large missing transverse momentum. Additionally, searches have been conducted in models where the Higgs Sector and the Dark Sector are connected leading for example to invisible Higgs boson decays. The results of recent searches on 13 TeV pp data, their interplay and interpretation are presented.
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44

Ellis, J., M. E. Gómez, S. Lola, R. Ruiz de Austri et Q. Shafi. « Confronting grand unification with lepton flavour violation, dark matter and LHC data ». Journal of High Energy Physics 2020, no 9 (septembre 2020). http://dx.doi.org/10.1007/jhep09(2020)197.

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Abstract We explore possible signatures for charged lepton flavour violation (LFV), sparticle discovery at the LHC and dark matter (DM) searches in grand unified theories (GUTs) based on SU(5), flipped SU(5) (FSU(5)) and SU(4)c×SU(2)L×SU(2)R (4-2-2). We assume that soft supersymmetry-breaking terms preserve the group symmetry at some high input scale, and focus on the non-universal effects on different matter representations generated by gauge interactions at lower scales, as well as the charged LFV induced in Type-1 see-saw models of neutrino masses. We identify the different mechanisms that control the relic DM density in the various GUT models, and contrast their LFV and LHC signatures. The SU(5) and 4-2-2 models offer good detection prospects both at the LHC and in LFV searches, though with different LSP compositions, and the SU(5) and FSU(5) models offer LFV within the current reach. The 4-2-2 model allows chargino and gluino coannihilations with neutralinos, and the former offer good detection prospects for both the LHC and LFV, while gluino coannihilations lead to lower LFV rates. Our results indicate that LFV is a powerful tool that complements LHC and DM searches, providing significant insights into the sparticle spectra and neutrino mass parameters in different models.
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45

Ostdiek, B. « Constraining the minimal dark matter fiveplet with LHC searches ». Physical Review D 92, no 5 (8 septembre 2015). http://dx.doi.org/10.1103/physrevd.92.055008.

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46

Calibbi, Lorenzo, Alberto Mariotti et Pantelis Tziveloglou. « Singlet-Doublet model : dark matter searches and LHC constraints ». Journal of High Energy Physics 2015, no 10 (octobre 2015). http://dx.doi.org/10.1007/jhep10(2015)116.

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47

Pedro, Rute. « Searches for dark matter with the ATLAS detector ». SciPost Physics Proceedings, no 12 (4 juillet 2023). http://dx.doi.org/10.21468/scipostphysproc.12.048.

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The presence of a non-baryonic Dark Matter (DM) component in the Universe is inferred from the observation of its gravitational interaction. If DM interacts weakly with Standard Model (SM) particles it could be produced at the LHC. The ATLAS experiment has developed a broad search program for DM candidates in final states with large missing transverse momentum produced in association with other SM particles (light and heavy quarks, photons, Z and H bosons, as well as additional heavy scalar particles). The results of recent searches on 13 TeV pp data, their interplay and interpretation are presented.
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48

Brea Rodríguez, Alexandre, Veronika Chobanova, Xabier Cid Vidal, Saúl López Soliño, Diego Martínez Santos, Titus Mombächer, Claire Prouvé, Emilio Xosé Rodríguez Fernández et Carlos Vázquez Sierra. « Prospects on searches for baryonic Dark Matter produced in $${\varvec{b}}$$-hadron decays at LHCb ». European Physical Journal C 81, no 11 (novembre 2021). http://dx.doi.org/10.1140/epjc/s10052-021-09762-w.

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AbstractA model that can simultaneously explain Dark Matter relic density and the apparent matter anti-matter imbalance of the universe has been recently proposed. The model requires b-hadron branching fractions to Dark Matter at the per mille level. The b-hadrons decay to a dark sector baryon, $$\psi _{\mathrm{DS}}$$ ψ DS , which has a mass in the region $$940 ~\mathrm{MeV}/c^2\le m_{\psi _{\mathrm{DS}}}\le 4430~\mathrm{MeV}/c^2$$ 940 MeV / c 2 ≤ m ψ DS ≤ 4430 MeV / c 2 . In this paper, we discuss the sensitivity of the LHCb experiment to search for this dark baryon, covering different types of topology and giving prospects for Runs 3 and 4 of the LHC, as well as for the proposed Upgrade II. We show that the LHCb experiment can cover the entire mass range of the hypothetical dark baryon.
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49

Bruggisser, Sebastian, Francesco Riva et Alfredo Urbano. « Strongly Interacting Light Dark Matter ». SciPost Physics 3, no 3 (2 septembre 2017). http://dx.doi.org/10.21468/scipostphys.3.3.017.

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We discuss a class of Dark Matter (DM) models that, although inherently strongly coupled, appear weakly coupled at small-energy and fulfill the WIMP miracle, generating a sizable relic abundance through the standard freeze-out mechanism. Such models are based on approximate global symmetries that forbid relevant interactions; fundamental principles, like unitarity, restrict these symmetries to a small class, in such a way that the leading interactions between DM and the Standard Model are captured by effective operators up to dimension-8. The underlying strong coupling implies that these interactions become much larger at high-energy and represent an interesting novel target for LHC missing-energy searches.
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50

Duque-Escobar, Santiago, Daniel Ocampo-Henao et José D. Ruiz-Álvarez. « Vector Boson Fusion topology and simplified models for dark matter searches at colliders ». Journal of High Energy Physics 2023, no 5 (8 mai 2023). http://dx.doi.org/10.1007/jhep05(2023)051.

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Abstract In this paper, we study the possible searches at colliders using Vector Boson Fusion topology in the context of Simplified Models signatures. We examine the possible physics reach of these searches with regard to monojet-type searches, and determine how these two signatures are complementary. We determine the generic characteristics for dark matter signatures in the LHC if the underlying physics imply Vector Boson Fusion type of production.
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