A5037745862- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Cosmology and Gravitation Theories
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Radiation Detection and Scintillator Technologies
- Neutrino Physics Research
- Scientific Research and Discoveries
- Advanced Semiconductor Detectors and Materials
- Distributed and Parallel Computing Systems
- Black Holes and Theoretical Physics
- Computational Physics and Python Applications
- Astronomy and Astrophysical Research
- CCD and CMOS Imaging Sensors
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Superconducting Materials and Applications
- Pulsars and Gravitational Waves Research
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum and electron transport phenomena
- Quantum, superfluid, helium dynamics
Rutherford Appleton Laboratory
2025
University of California System
2025
University of Padua
2022-2024
University of California, San Diego
2017-2024
Technical University of Darmstadt
2024
Institute of High Energy Physics
2021-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Padova
2024
State Key Laboratory of Nuclear Physics and Technology
2023
Università degli Studi del Piemonte Orientale “Amedeo Avogadro”
2023
Goethe University Frankfurt
2023
We study the direct detection prospects for a representative set of simplified models sub-GeV dark matter (DM), accounting existing terrestrial, astrophysical and cosmological constraints. focus on lighter than an MeV, where these constraints are most stringent, find three scenarios with accessible cross sections: (i) DM interacting via ultralight kinetically mixed photon, (ii) sub-component nucleons or electrons through light scalar vector mediator, (iii) coupled mediator heavier ~ 100 keV.
This document is the final report of ATLAS-CMS Dark Matter Forum, a forum organized by ATLAS and CMS collaborations with participation experts on theories Matter, to select minimal basis set dark matter simplified models that should support design early LHC Run-2 searches. A prioritized, compact benchmark proposed, accompanied studies parameter space these repository generator implementations. also addresses how apply Effective Field Theory formalism for collider searches present results...
This document a outlines set of simplified models for dark matter and its interactions with Standard Model particles. It is intended to summarize the main characteristics that these have when applied searches at LHC, provide number useful expressions reference. The list includes both s-channel t-channel scenarios. For s-channel, spin-0 spin-1 mediations are discussed, also realizations where Higgs particle provides portal between visible sectors. guiding principles underpinning proposed...
We show that ultraperipheral heavy-ion collisions at the Large Hadron Collider (LHC) can be used to search for axionlike particles with mass below 100 GeV. The Z^{4} enhanced photon-photon luminosity from ions provides a large exclusive production rate, signature of resonant pair back-to-back photons and no other activity in detector. In addition, we present both new updated limits recasting multiphoton searches LEP II LHC, which are more stringent than those currently literature range MeV
We show that polar materials are excellent targets for direct detection of sub-GeV dark matter due to the presence gapped optical phonons as well acoustic with high sound speed. take example Gallium Arsenide (GaAs), which has properties needed experimental realization, and where many results can be estimated analytically. find GaAs reach photon absorption, completely cover freeze-in benchmark scattering via an ultralight photon, is competitive other proposals detect sub-MeV off nuclei.
High-precision measurements of the temperature and polarization anisotropies cosmic microwave background radiation have been previously employed to set robust constraints on dark matter annihilation during recombination. In this work we improve generalize these apply energy deposition recombination era with arbitrary redshift dependence. Our approach also provides more rigorous model-independent bounds decay scenarios. We employ principal component analysis identify a basis weighting...
We examine cosmological, astrophysical and collider constraints on thermal dark matter (DM) with mass mX in the range 1 MeV to 10 GeV. Cosmic microwave background (CMB) observations, which severely constrain light symmetric DM, can be evaded if DM relic density is sufficiently asymmetric. CMB require present anti-DM ratio less than 2*10^{-6} (10^{-1}) for = (10 GeV) ionizing efficiency factor f ~ 1. determine minimum annihilation cross section achieving these asymmetries subject constraint;...
Semiconductors are by now well-established targets for direct detection of MeV to GeV dark matter via scattering off electrons. We show that semiconductor can also detect significantly lighter an absorption process. When the mass is above band gap (around eV), proceeds excitation electron into conduction band. Below gap, multi-phonon excitations enable in 0.01 eV range. Energetic particles emitted from sun be probed masses below eV. derive reach a relic kinetically mixed photon or...
Dark matter particles significantly lighter than in the paradigmatic WIMP scenario are increasingly considered to be phenomenologically viable. Detecting these requires new experiment strategies. The paper proposes that experiments based on certain superconducting targets could detect ultralight dark with masses meV-eV range.
We propose new searches for axionlike particles (ALPs) produced in flavor-changing neutral current (FCNC) processes. This proposal exploits the often-overlooked coupling of ALPs to W^{±} bosons, leading FCNC production even absence a direct fermions. Our proposed resonant ALP decays such as B→K^{(*)}a, a→γγ, and K→πa, a→γγ could greatly improve upon sensitivity couplings standard model particles. also determine analogous constraints discovery prospects invisibly decaying ALPs.
Dark matter (DM) could couple to Standard Model (SM) particles through a light mediator and this be responsible for the observed DM abundances $f\phantom{\rule{0}{0ex}}r\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}z\phantom{\rule{0}{0ex}}e\ensuremath{-}i\phantom{\rule{0}{0ex}}n$. Here, authors identify an additional production channel decay of photons that have acquired in-medium plasma mass. They contribute relic abundance, lowering by order magnitude target...
We consider the direct detection of dark matter (DM) with polar materials, where single production optical or acoustic phonons gives excellent reach to scattering sub-MeV DM for both scalar and vector mediators. Using Density Functional Theory (DFT), we calculate material-specific matrix elements, focusing on GaAs sapphire, show that in an anisotropic crystal such as sapphire features a strong directional dependence. For example, candidate mass 40 keV relic abundance set by freeze-in, daily...
Knowing the charge of parton initiating a light-quark jet could be extremely useful both for testing aspects Standard Model and characterizing potential beyond-the-Standard-Model signals. We show that despite complications hadronization out-of-jet radiation such as pile-up, weighted sum charges jet's constituents can used at LHC to distinguish among jets with different charges. Potential applications include measuring electroweak quantum numbers hadronically decaying resonances or...
These lectures provide an introduction to models and direct detection of dark matter. We summarize the general features motivations for candidates in full matter mass range, then restrict keV-TeV window. Candidates this window can be produced by thermal mechanisms standard cosmology, are important target experimental searches. turn sub-GeV (light matter) sectors, area where many new experiments currently being proposed. discuss cosmology specific portal realizations, some prospects...
Thermal relic dark matter particles with a mass of 31--40 GeV that dominantly annihilate to bottom quarks have been shown provide an excellent description the excess gamma rays observed from center Milky Way. Flavored provides well-motivated framework in which can couple flavor-safe manner. We propose phenomenologically viable model flavored account for spectral shape and normalization gamma-ray while naturally suppressing elastic scattering cross sections probed by direct detection...
Monojet searches are a powerful way to place model-independent constraints on effective operators coupling dark matter the standard model. For generated by exchange of scalar mediator, however, couplings light quarks suppressed and prospect probing such interactions through inclusive monojet channel at LHC is limited. We propose dedicated searches, focusing bottom top quark final states, constrain this class operators. show that search in mono $b$-jets can significantly improve current...
Light dark matter searches require new experimental approaches compared to the well-established nuclear-recoil techniques now in use. In this paper, authors consider potential detect sub-MeV via multi-excitation modes superfluid helium.
Numerous astrophysical and cosmological observations are best explained by the existence of dark matter, a mass density which interacts only very weakly with visible, baryonic matter. Searching for extremely weak signals produced this matter strongly motivate development new, ultra-sensitive detector technologies. Paradigmatic advances in control readout massive mechanical systems, both classical quantum regimes, have enabled unprecedented levels sensitivity. In white paper, we outline...
A fermion dark matter candidate with a relic abundance set by annihilation through pseudoscalar can evade constraints from direct detection experiments. We present simplified models that realize this fact coupling sector to two-Higgs doublet model. These are generalizations of mixed bino-Higgsino in the MSSM, more freedom couplings and scalar spectra. Annihilation near resonance allows significant amount parameter space for thermal compared singlet-doublet matter, which fermions couple only...
If a component of the dark matter has dissipative interactions, it could collapse to form thin disk in our Galaxy that is coplanar with baryonic disk. It been suggested disks explain variety observed phenomena, including periodic comet impacts. Using first data release from Gaia space observatory, we search for via its effect on stellar kinematics Milky Way. Our new limits disfavor presence disk, and present updated measurements total density Solar neighborhood.
We propose the use of silicon carbide (SiC) for direct detection sub-GeV dark matter. SiC has properties similar to both and diamond but two key advantages: (i) it is a polar semiconductor which allows sensitivity broader range matter candidates; (ii) exists in many stable polymorphs with varying physical hence tunable various models. show that an excellent target search electron, nuclear phonon excitations from scattering down 10 keV mass, as well absorption processes meV mass. Combined its...
When a nucleus in an atom undergoes collision, there is small probability of electron being excited inelastically as result the Migdal effect. In this Letter, we present first complete derivation effect from dark matter-nucleus scattering semiconductors, which also accounts for multiphonon production. The rate can be expressed terms energy loss function material, calculate with density functional theory methods. Because smaller gap excitations, find that much higher semiconductors than...
We present DarkELF, a python package to calculate interaction rates of light dark matter in dielectric materials, including screening effects. The full response the material is parametrized terms energy loss function (ELF) material, which DarkELF converts into differential scattering for both direct electron and through Migdal effect. In addition, can rate produce phonons from sub-MeV via photon mediator, as well absorption comprised photons. includes precomputed ELFs Al,...
A number of direct detection experiments are searching for electron excitations created by scattering sub-GeV dark matter. We present an alternate formulation matter-electron in terms the dielectric response a material. For matter which couples to electrons, this approach automatically accounts in-medium screening effects, were not included previous rate calculations semiconductor targets. show that effects appear both scalar and vector mediators. The result is non-negligible reduction reach...