Description
Conveners:
Fady Bishara (DESY)
James Frost (University of Oxford)
Silvia Scorza (LPSC Grenoble)
Contact: eps23-conveners-t03 @desy.de
We consider threshold effects of thermal dark matter (DM) pairs (fermions and antifermions) interacting with a thermal bath of dark gauge fields in the early expanding universe. Such threshold effects include the processes of DM pairs annihilating into the dark gauge fields (light d.o.f.) as well as electric transitions between pairs forming a bound state or being unbound but still feeling...
The null results of dark matter at experiments motivate us to look beyond the usual freeze-out mechanisms, and work out the upper bound on the dark matter masses which could be probed at experiments. In this talk, we shall briefly overview different production mechanisms, and correspondingly upper bounds of dark matter in those scenarios. In addition, we shall focus on the exponential...
Models of feebly-interacting Dark Matter (DM), potentially detectable in long-lived particle searches, have gained popularity due to the non-observation of DM in direct detection experiments. Unlike DM freeze-out, which occurs when the dark sector particles are non-relativistic, feebly-interacting DM is primarily produced at temperatures corresponding to the heaviest mass scale involved in the...
Although the Standard Model is very successful, there are still open
problems which it cannot explain, one of it being dark matter (DM).
This has led to various Beyond Standard Model theories, of which Two
Higgs Doublet models are very popular, as they are one of the simplest
extensions and lead to a rich phenomenology. Further extensions with
a complex singlet lead to a natural DM...
We investigate ways of identifying two kinds of dark matter component particles at high-energy colliders. The strategy is to notice and
distinguish double-peaks(humps) in some final state observable. We
carried out our analysis in various popular event topologies for dark
matter search, such as mono-X and n-leptons+n-jets final state along
with missing energy/transverse momenta. It turns...
The cold dark matter (CDM) candidate with weakly interacting massive
particles can successfully explain the observed dark matter relic
density in cosmic scale and the large-scale structure of the Universe.
However, a number of observations at the satellite galaxy scale seem
to be inconsistent with CDM simulation.
This is known as the small-scale problem of CDM.
In recent years, it has...
Axion-like particles (ALPs) are leading candidates to explain the dark matter in the universe. Their production via the misalignment mechanism has been extensively studied for cosine potentials characteristic of pseudo-Nambu-Goldstone bosons. In this work we investigate ALPs with non-periodic potentials, which allow for large misalignment of the field from the minimum. As a result, the ALP can...
Axion kinetic misalignment is a mechanism that may enhance the dark matter relic found in models of QCD axions or axion-like-particles by considering initial conditions with large kinetic energy. This is interesting because it motivates axion dark matter at lower decay constants where the couplings to matter, incl. detectors, are stronger. I will here give an introduction to this mechanism. I...
DarkSide-50 is an experiment for direct dark matter detection at Laboratori Nazionali del
Gran Sasso. It uses a dual-phase time projection chamber filled with low-radioactivity argon extracted from underground. Thanks to single electron sensitivity and with an analysis based on the sole ionization signal, Darkside-50 set the most stringent exclusion limit on WIMPs with a mass of few...
XENONnT is the follow-up to the XENON1T experiment aiming for the direct detection of dark matter in the form of weakly interacting massive particles (WIMPs) using a liquid xenon (LXe) time projection chamber (TPC). The detector, operated at Laboratori Nazionali del Gran Sasso (LNGS) in Italy, features a total LXe mass of 8.5 tonnes of which 5.9 tonnes are active. XENONnT has completed its...
LUX-ZEPLIN (LZ) is a direct detection dark matter experiment hosted in the Davis Campus of the Sanford Underground Research Facility in Lead, South Dakota. LZ's central detector is a dual-phase time projection chamber utilizing 7 active tonnes of liquid xenon (LXe) and is aided by a LXe "skin" detector and liquid scintillator-based outer detector to veto events inconsistent with dark matter...
Cryogenic Rare Event Search with Superconducting Thermometers (CRESST) is a direct detection dark matter (DM) search experiment located at Laboratori Nazionali del Gran Sasso (LNGS) in Italy. The experiment employs cryogenic and scintillating crystals to search for nuclear recoils from DM particles, and has repeatedly achieved thresholds below 100 eV in its third phase (CRESST III) for a wide...
With its increasing statistical significance, the DAMA/LIBRA annual modulation signal is a cause for tension in the field of dark matter direct detection. A possible standard dark matter explanation for this signal is highly incompatible with the null results of numerous other experiments. The COSINUS experiment aims at a model-independent cross-check of the DAMA/Libra signal claim.
For such...
The NEWS-G collaboration is searching for light dark matter candidates using a novel gaseous detector concept, the spherical proportional counter. Access to the mass range from 0.05 to 10 GeV is enabled by the combination of low energy threshold, light gaseous targets (H, He, Ne), and highly radio-pure detector construction. Initial NEWS-G results obtained with SEDINE, a 60 cm in diameter...
The DEAP-3600 detector is a single-phase direct-detection Dark Matter (DM) experiment located 2 km underground at SNOLAB in Sudbury, Canada. The detector consists of 3279 kg of LAr contained in a spherical acrylic vessel. It was specifically designed to search for direct detection of dark matter candidates known as Weakly-Interacting Massive Particles (WIMPs). Radioisotope surface activity is...
Darkside-20k is a next-generation dual-phase Liquid Argon Time Projection Chamber (LAr TPC), currently under construction at the Gran Sasso National Laboratory (LNGS) in Italy. The 20t fiducial liquid Argon mass will probe WIMP-nucleon interactions, with sensitivity to cross sections equal to $10^{-48}$ cm$^2$ for a WIMP mass of 0.1 TeV/𝑐$^2$ considering the exposure goal of 200 tonne-years....
The nature of dark matter is still a mystery in physics and the detection of particle dark matter has eluded experiments for decades. DARWIN is a next-generation liquid-xenon-based experiment that plans to reach a dark matter sensitivity limited by the cosmic neutrino background. With a proposed active target of 40 t of liquid xenon, ultra-low radioactive background, and keV-level threshold,...
There is a compelling physics case for a large, xenon-based underground detector devoted to dark matter and other rare-event searches. A two-phase time projection chamber as inner detector allows for a good energy resolution, a three-dimensional position determination of the interaction site and particle discrimination. To study challenges related to the construction and operation of a...
Despite decades of experimental efforts, the direct detection of a dark matter (DM) signal has remained elusive. Leading experiments typically have sensitivity to DM candidates in the mass range from 10 GeV to O(1 TeV), therefore a sensitive detection method to probe the sub-GeV mass range is highly motivated. The TESSERACT collaboration aims to use two fully defined sensor technologies (SPICE...
The SABRE (Sodium iodide with Active Background REjection) experiment aims to detect an annual rate modulation from dark matter interactions in ultra-high purity NaI(Tl) crystals in order to provide a model independent test of the signal observed by DAMA/LIBRA. It is made up of two separate detectors; SABRE South located at the Stawell Underground Physics Laboratory (SUPL), in regional...
The HIBEAM/NNBAR program at the ESS will perform a high-sensitivity search for neutron oscillations with a potential to shed light on physics beyond the Standard Model. This program comprises two distinct phases: HIBEAM and NNBAR. HIBEAM will focus on the search for neutron-sterile neutron ($n$ - $n'$) oscillations, offering an opportunity to explore the physics of the dark sector, while the...
The Migdal in Galactic Dark mAtter expLoration (MIGDAL) experiment aims to make the first direct and unambiguous observation of the Migdal effect from fast neutron scattering using intense DT and DD generators, allowing the effect to be investigated over a wide range of nuclear recoil energies.
The experiment uses an Optical Time Projection Chamber equipped with a stack of two glass-GEMs...
The proposed LUXE experiment (LASER Und XFEL Experiment) at DESY, Hamburg, using the electron beam from the European XFEL, aims to probe QED in the non-perturbative regime created in collisions between high-intensity laser pulses and high-energy electron or photon beams. This setup also provides a unique opportunity to probe physics beyond the standard model. In this talk we show that by...
The viable dark matter (DM) candidate mass range spans 90 orders of magnitude. The natural scenario where DM originates from thermal contact with familiar matter in the early Universe dramatically restricts this window to ~MeV to ~100 TeV. Considerable experimental efforts have sought Weakly Interacting Massive Particles in the upper end of this range (few GeV to several TeV), while the region...
The elusive Dark Matter (DM), proposed due to its gravitational interaction with ordinary matter, supposedly makes up ∼ 25% of our universe. Various models aim to explain the origin and properties of dark matter, many of these proposing beyond standard model particles to make up most of the DM in our universe. The ALPS II (Any Light Particle Search II) light-shining-through-walls experiment...
he Any Light Particle Search II (ALPS II) is a Light Shining through a Wall experiment at DESY in Hamburg, which will hunt for axions and axion-like particles in the sub-meV mass range with an axion-photon-photon coupling $g_{\alpha \gamma \gamma} > 2 \times 10^{-11}\ \rm{GeV^{-1}}$, improving the sensitivity by a factor of $10^3$ compared to its predecessors. For this purpose, a high-power...
The MAgnetized Disc And Mirror Axion eXperiment is designed to search for dark matter axions in the mass range around 100 µeV, which previously was inaccessible by other experiments. This mass range is favored by models in which the PQ symmetry is broken after inflation. The required sensitivity is reached in MADMAX by applying the dielectric haloscope approach, exploiting the axion to photon...
The BREAD Collaboration is establishing a program of broadband searches for terahertz axion dark matter. Its hallmark is a cylindrical metal barrel converting axions to photons, focused by a parabolic reflector to low-noise photosensors. Practically, this novel dish antenna geometry enables enclosure inside standard cryostats and high-field solenoidal magnets. BREAD plans to open multiple...
We report the first search for the Sagittarius tidal stream of axion dark matter around 4.55 µeV using CAPP-12TB haloscope data acquired in March of 2022.
Our result excluded the Sagittarius tidal stream of Dine-Fischler-Srednicki-Zhitnitskii and Kim-Shifman-Vainshtein-Zakharov axion dark matter densities of ρa >~ 0.184 and >~ 0.025 GeV/cm3 , respectively, over a mass range from 4.51 to 4.59...
We present the design, status and first results of a detector to search for axions and axion-like particles in the galactic halo using laser interferometry. The detector is sensitive to the polarisation rotation of linearly polarised light induced by an axion field in the mass range from $10^{−16}$ $eV$ up to $10^{−8}$ $eV$, and is likely to significantly surpass the CAST limit. Currently, we...
The presence of dark matter can explain several observations in the universe. However, its nature is still unknown. Therefore, the study of dark matter is a rapidly evolving field. New techniques and methods are being applied all the time. The measurement of the direction of WIMP-induced nuclear recoils is a challenging strategy to extend dark matter searches beyond the neutrino floor...
The LUX-ZEPLIN (LZ) dark matter search experiment is a dual-phase xenon time projection chamber operating at the Sanford Underground Research Facility in Lead, South Dakota, USA. It is comprised of 10-tonnes of liquid xenon, outfitted with photomultiplier tubes in both the central and the self-shielding regions. This is then enclosed within an active gadolinium-loaded liquid scintillator veto...
In this talk, we present two gauge models for light-dark matter: one with an exotic positive charged lepton and the other one is a variant with right-handed neutrinos. The scalar self-interacting dark matters are stable without imposing new symmetry and should be weak-interacting. We study the impact of the self-interacting light dark matter on the formation of the dark halo, the observation...
Dark matter is believed to account for 85$\%$ of the matter of the Universe. The lead dark matter candidate is the WIMP (weakly interacting massive particles). Light dark matter refers to WIMP candidates with a mass of less than 1 GeV. The concept of light DM has been developed in order to explain the 511 keV $\gamma$-ray from the galactic bulge, as observed by the INTEGRAL satellite. There...
Dark matter is a mysterious and elusive form of matter in our Universe of which we can only measure gravitational effects. According to the most accredited theoretical models, dark matter particles in our galaxy might annihilate and produce standard model particle-antiparticle pairs which, traveling through the galaxy, can reach the Earth and be detected by space-borne experiments such as...
