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Kathryn Zurek08/10/2026, 16:30
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Chuan-Yang Xing (China University of Petroleum)Experiment
The sub-meV range is an important window for ultralight bosonic dark matter, including dark photons and axions, where conventional microwave cavities and dish antanna schemes face sensitivity limits. This talk presents a parallel-plate waveguide haloscope that uses slow-wave response and coherent buildup along the waveguide to achieve guided-wave enhancement while preserving an open geometry....
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Prof. Simone Biondini (Institute of Physics, University of Freiburg)Theory
We investigate low-scale first-order phase transitions in Abelian dark sectors as a possible origin of the stochastic gravitational-wave background recently hinted at by Pulsar Timing Array observations. We consider a minimal dark Higgs model with a broken (U(1)_d) gauge symmetry, supplemented by a fermionic dark matter candidate and portal interactions connecting the dark and visible sectors....
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Heba Abdulrahman (University of KwaZulu Natal)Theory
We investigate the evolution of cosmological perturbations in an anisotropic universe described by a locally rotationally symmetric (LRS) Bianchi type I spacetime with a positive cosmological constant. Using the covariant 1+3 and 1+1+2 formalisms, we derive the full set of linear perturbation equations for scalar modes and analyze their evolution on an anisotropic background. We first solve...
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Mr Mohammad Aghaie (University of Osaka)Theory
In this talk, I will present a concrete ultraviolet completion of anomaly-free axion-like particles (ALPs) based on Nelson–Barr models of spontaneous CP violation. Building on the effective field theory framework for anomaly-free ALPs developed in my previous work (arXiv:2404.12199), I will show that these models naturally predict a light pseudo-Goldstone boson whose couplings to photons and...
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Vincenzo FiorentinoTheory
We investigate a scenario where Strongly Interacting Massive Particle (SIMP) dark matter interacts with an axion-like particle (ALP) that couples exclusively to electrons. This minimal setup provides interactions which enforce thermal equilibrium between dark matter and the SM in the early Universe. We analyze the cosmological evolution of the dark sector and the constraints arising from dark...
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Prof. Shaaban Khalil (Zewail City of Science and Technology)Theory
Minimal supersymmetric $B-L$ hybrid inflation predicts a negligible vacuum tensor-to-scalar ratio $r_{\mathrm{vac}}\sim 10^{-8}$ due to its extremely flat potential. In this letter, we show that adding a spectator axion-like field coupled to the $U(1)_{B-L}$ gauge sector via a Chern-Simons term circumvents this suppression. The rolling axion triggers a tachyonic instability for one gauge-field...
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Mrs Aissata ly (CERN)Experiment
The ATLAS experiment investigates a wide range of physical processes produced in proton–proton (pp) collisions at the Large Hadron Collider (LHC). Among these are searches for dark-sector signatures, including S/H → ZdZd→4ℓ, which require a precise understanding of Standard Model backgrounds. Where H is the Standard Model Higgs boson, S a hypothetical scalar boson arising from physics beyond...
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Ganesh Parida (Brookhaven National Laboratory (US)), Jae Doo Nam (Brookhaven National Laboratory (US))Experiment
The Electron-Ion Collider (EIC) is primarily designed to study the structure of the nucleus and the dynamics of the strong interaction. However, its high luminosity, polarized beams, broad center-of-mass energy range, and the ability to collide a variety of atomic nuclei also provide unique opportunities to search for physics beyond the Standard Model (BSM). A broad BSM program can be pursued...
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Maksym Ovchynnikov (CERN)Experiment
We investigate the sensitivity of the Electron-Ion Collider (EIC) to invisible final states in coherent exclusive electroproduction.
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The characteristic signal is a forward proton with reduced energy and little additional detector activity. Using the excellent particle detection capabilities and kinematics reconstruction at the EIC, we argue that backgrounds can be strongly suppressed. While... -
Aleksandr Pustyntsev (Johannes Gutenberg University of Mainz)Experiment
Low-energy precision experiments provide unique sensitivity to feebly coupled light states that are inaccessible at high-energy colliders. In this talk, we present projected sensitivities for light Beyond the Standard Model (BSM) mediators with masses below 100 MeV at two such facilities. First, we explore the MAGIX experiment at MESA, utilizing high-intensity electron beams on a heavy...
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Prof. Simone Biondini (Institute of Physics, University of Freiburg)Theory
We investigate the flavour structure of thermal dark matter in t-channel simplified models and identify which scenarios remain compatible with current flavour, direct-detection, and collider constraints. Using flavour symmetries and spurion expansions as organizing principles, we systematically chart the space of viable dark matter interactions within the frameworks of Minimal Flavour...
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Jie Sheng (Kavli IPMU)Experiment
Light dark matter with sub-eV masses has a high number density in our galaxy, and its scattering cross section with macroscopic objects can be significantly enhanced by coherence effects. Repeated scattering with a target object can induce a measurable acceleration. Torsion balance experiments with geometric asymmetry are, in principle, capable of detecting such signals. Our analysis shows...
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Dr Mathew Thomas (School of Physics, IISER Thiruvananthapuram)Theory
Baryon number violation in the visible sector induced by antibaryonic dark matter provides a viable mechanism for low-scale baryogenesis. Two of the most sensitive probes of this scenario are neutron decay processes, such as neutron (n) -> invisible and n -> pion+ invisible. In this work, we discuss the possible spontaneous breaking of baryon symmetry in the dark sector and the generation of...
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Jared BarronTheory
If the dark sector has multiple particle species interacting with a dark gauge boson, complex phenomenology mirroring the behaviour of Standard Model hydrogen can result. I will discuss this phenomenology and present constraints on the atomic dark matter scenario from a wide range of cosmological probes across redshift and scales.
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Leo KimTheory
Many dark sector models predict the formation of dark objects, such as solitons and dark stars, which can be probed through their gravitational lensing of gravitational waves (GWs). Although these objects vary widely in size and compactness, most GW lensing studies have focused on point-like lenses. Applying these constraints to extended objects can therefore overstate their bounds. We...
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Maksym Ovchynnikov (CERN)Theory
In this talk, I review cosmological probes of dark sectors using Big Bang Nucleosynthesis (BBN) and the Cosmic Microwave Background (CMB), with a focus on scenarios that become relevant at keV–MeV temperatures. I begin by introducing a new methodological framework for solving neutrino evolution in non-standard cosmologies, and then present several case studies motivated by recent primordial...
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Prof. Gennady Kozlov (Joint Institute for Nuclear Research (RU))Theory
We would claim to the preliminary analysis where the dark matter candidate is from the approximate scale symmetry theory of a hidden sector. The dynamical system of the scalar particles in the hidden sector at finite temperature and chemical potential is considered. As the cosmological application, we propose the feebly interacting dark matter with the Standard Model fields, where the...
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Navin McGinnisExperiment
Direct searches for dark matter with large-scale noble liquid detectors have become sensitive enough to detect the coherent scattering of local neutrinos. This will become a very challenging background to dark matter discovery in planned future detectors. For dark matter with mass above 10 GeV, the dominant neutrino backgrounds on Earth are atmospheric neutrinos created by cosmic ray...
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Zouhair HindiTheory
We study a nonstandard dark-matter thermal history in which strong self-interactions give rise to collective many-body effects at high number density, as in strongly interacting quantum media. At early times, dark matter occupies a correlated phase in which its coupling to a light mediator is dynamically screened, suppressing annihilation far below the
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perturbative rate. As the Universe... -
Adam RitzTheory
I’ll review some recent attempts to model the production of GeV-scale dark sector degrees of freedom, including dark photons, via proton bremsstrahlung at accelerators and fixed target experiments.
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Clara Hofheinz (University of Freiburg)Theory
Freeze-in production of feebly interacting dark matter in the early Universe provides an alternative to the widely studied freeze-out mechanism. In this work, we investigate the freeze-in production of a fermionic dark matter candidate generated from electrons through a massive dark vector mediator. In addition to dark vector decays into pairs of dark fermions, we include number-changing...
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Christopher CappielloTheory
A large body of work has focused on the sensitivity of future MeV-range telescopes to photon signals of dark matter. However, less emphasis has been placed on the ability of such instruments to distinguish different dark matter models in the event of an observation. In this work, we assess the potential of future MeV telescopes to distinguish primordial black hole dark matter from decaying...
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Bhawna Gomber (University of Hyderabad, India)Experiment
Many beyond the standard model models have potential dark matter candidates which interact with the standard model particles primarily through their coupling to Higgs. CMS has investigated many such models. Some recent results involving singly produced standard model like Higgs Boson recoiling from undetected dark matter are presented in this contribution.
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Vincenzo FiorentinoTheory
We investigate the scenario of maximally invisible axions, namely QCD axions whose interactions with matter arise exclusively from the irreducible coupling induced by the operator $\frac{a}{f_a} \frac{g_s^2}{32 \pi^2} G_{\mu \nu}^a \tilde{G}^{a, \mu \nu}$.
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We first analyze the production of such axions in core-collapse supernovae. In particular, we derive the corresponding SN1987A... -
Theo Karydas (GRAPPA, University of Amsterdam)Experiment
Extreme mass-ratio inspirals (EMRIs) observed by LISA will provide exquisitely precise probes of supermassive black hole environments. In this talk, I will examine the imprint of dense spikes of self-annihilating, WIMP-like dark matter on EMRI waveforms. I will show how annihilation modifies the spike profile, how the resulting distribution affects the inspiral dynamics, and how relativistic...
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Prof. Simone Biondini (Institute of Physics, University of Freiburg)Theory
Near-threshold effects such as Sommerfeld enhancement and bound-state formation can substantially modify the thermal freeze-out of dark matter interacting through long-range forces. Over the past years, considerable theoretical progress has led to increasingly precise descriptions of these effects within non-relativistic effective field theories and their thermal extensions. However,...
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Andrea Merli (EPFL - Ecole Polytechnique Federale Lausanne (CH))Experiment
The upgraded LHCb trigger and reconstruction framework has significantly expanded the experiment's sensitivity to long-lived particles by enabling the efficient reconstruction of decay vertices using only tracks reconstructed in the downstream tracking stations. This novel capability extends the fiducial decay volume to approximately 8 m from the interaction point, opening a previously...
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OTHER SPEAKERExperiment
The NA62 experiment at CERN, designed to measure the highly-suppressed decay $K^{+} \to \pi^{+}\nu\bar{\nu}$, has the capability to collect data in a beam-dump mode, where 400 GeV protons are dumped on an absorber. In this configuration, New Physics particles may be produced in the absorber and decay in an instrumented volume beginning approximately 80 m downstream of the dump. Preliminary...
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OTHER SPEAKERExperiment
Searches for the decays $K^{+}\rightarrow\pi^{+}X$ and $\pi^{+}\rightarrow e^{+}N$ are presented using data collected by the NA62 experiment at CERN in 2016--2022 and 2017--2024, respectively. Results are interpreted to constrain a range of new physics scenarios covering all four portal model scenarios. Upper limits on the $K^{+}\rightarrow\pi^{+}X$ branching ratio are established at the...
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Dr Mustafa Ashry (Department of Mathematics, Faculty of Science, Cairo University, Egypt)Theory
We employ transformers to probe the anomalous quartic gauge couplings in the Standard Model effective field theory Using Machine Learning transformers models via the process pp->WW(2j+2\nu)+\gamma. Two transformer models are used to learn the patterns of the signal and background simulated features including the color structures of both of them to discriminate between them, thus narrowing the...
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Qiang Li (Peking University (CN))Experiment
This work presents a novel cosmic-ray scattering experiment employing a Resistive Plate Chambers (RPC) muon tomography system. By introducing the scattering angle between incident and outgoing cosmic-ray tracks as a key observable, this approach enables simultaneous studies of secondary cosmic-ray composition and searching for new physics. During a 63-day campaign, 1.18 million cosmic ray...
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Dr Khushboo Dixit (Centre for Astro-Particle Physics, University of Johannesburg)Experiment
High-energy neutrinos offer a promising way to probe the nature of dark matter, especially in regions where dark matter is expected to be densely concentrated, such as near supermassive black holes in active galaxies. Recent observations by the IceCube Neutrino Observatory have identified several active galactic nuclei—including TXS 0506+056, NGC 1068, PKS 1424+240, and NGC 4151—as likely...
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Emre SittiExperiment
This work explores exotic signatures from confining dark sectors that may arise in the e+e- collision mode at the Future Circular Collider. Assuming the Higgs boson mediates the interaction between the Standard Model and the dark sector, dark quarks can be produced in e+e- collisions. The ensuing strong dynamics may lead to semi-visible jet final states, containing both visible and invisible...
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Khushboo DixitTheory
Quantum information has recently gained increasing attention in the particle physics community as a complementary framework for studying high-energy and astroparticle systems. Alongside traditional observables such as probabilities, rates, cross sections, and spectra, quantum information measures provide an alternative platform to characterize coherence, correlations, entanglement, and...
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Yue Xu (University of Washington (US))Experiment
FASER is a dedicated forward experiment at the LHC designed to search for light, weakly coupled particles beyond the Standard Model. This talk will present an overview of FASER's dark-sector search program and review the latest results from Run 3 data. The experimental approach and analysis techniques used in searches for long-lived particles will be discussed, together with the implications...
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Haidar Sheikhahmadi (Institute for Research in Fundamental Sciences (IPM); North-West University (NWU))Theory
In this work, after discussing the bubble loop corrections for spectators, we address the debate surrounding one-loop corrections to large-scale CMB modes in single-field inflation models with an intermediate ultra-slow-roll (USR) phase. Using the in-in formalism with a unified UV-IR regularization scheme, we systematically analyze the regularization and renormalization of these corrections,...
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Michelle Contreras Cossio (University of Texas at Austin (US))Experiment
A search is performed for long-lived dark photons decaying to two leptons, producing a final state signature of one or more displaced dilepton vertices. A partial Run 3 dataset is used, consisting of data collected by the ATLAS detector from 2022 to 2024, for a total of 165 fb−1. The dark photons are produced in the decay of an s-channel resonance, which can be either a generic scalar 𝑆 or a...
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Senjuti Bhattacharya (Eotvos Lorand University (HU))Experiment
The COmpact Detector for EXotics at LHCb (CODEX-b) is a proposed particle physics detector consisting of a 10~m $\times$ 10~m $\times$ 10~m array of Resistive Plate Chamber (RPC) triplet units, which is to be installed in order to search for physics beyond the Standard Model, targeting long-lived particles. CODEX-b offers a complementary search strategy by occupying a shielded transverse...
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Maksym Ovchynnikov (CERN)Theory
We delineate the maximal parameter space of sterile neutrino dark matter in the presence of lepton flavor asymmetries. We focus on large flavor asymmetries with vanishing total lepton asymmetry, which are washed out by neutrino oscillations at MeV temperatures and hence are consistent with BBN and CMB constraints. We derive a semi-classical Boltzmann equation for sterile neutrinos applicable...
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Momchil NaydenovTheory
We investigate the interactions of high-energy exotic particles, focusing on axions and axion-like particles (ALPs), with nucleon-based detector systems. Within the framework of the NA62 beam-dump configuration, we examine both theoretical and experimental aspects of ALP production, propagation, decay, and direct interactions with detector material, with particular emphasis on calorimetric...
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Dr Umut Kose (ETH-Zurich)Experiment
The FASER experiment is located 480 m downstream of the ATLAS interaction point at the Large Hadron Collider (LHC), aligned with the beam collision axis. Shielded by approximately 100 meters of rock and concrete, FASER operates in an exceptionally low-background environment that enables unique studies of forward physics. The experiment's goals include two complementary physics programs:...
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Laura Segui (CAPA, Universidad de Zaragoza), RADES CollaborationExperiment
Axion haloscopes operating at sub-GHz frequencies are promising to explore the low-mass QCD axion parameter space, but they face major challenges associated with the large cavity volumes required and the noise limitations of conventional readout systems. Within the RADES collaboration, the DarkQuantum ERC Synergy Grant is developing a new generation of quantum-enhanced haloscopes targeting the...
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