EPS-HEP 2025

6 Jul 2025, 16:00 → 11 Jul 2025, 18:30 Europe/Paris

PALAIS DU PHARO, Marseille, France

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Key dates

 

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Sunday 6 July

16:00 Arrival, registration

Monday 7 July

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10:45 Coffee break

Opening

1 Opening

Plenary

2 Recent results in Higgs physics

Speaker: Emanuele Di Marco (INFN Roma1)

12:30 Lunch

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3 Phenomenology of extended axion models

Efforts for axion’s search have been reinforced in the past decades, motivated by its rich phenomenology allowing for various ways to probe its parameter. Axions provide a solution to the Strong CP puzzle while being a dark matter candidate. In a spirit of minimality, we attempt to have it solve additional puzzles. We are particularly interested in coupling the axion to the sector of Baryogenesis and a scalar sector from conformal symmetry.
First, axion is the Goldstone of an internal $U(1)$ which easily mixes with other flavor symmetries such as Baryon and Lepton numbers. Scenarii of dark matter carrying a baryon number of two open up a new BSM sector that we could probe in neutron-antineutron oscillations. In particular, for light dark matter with mass in the micro-eV range, such coupling induces Rabi resonances in the oscillations. Although the tuning of the magnetic field required to reach the resonance makes the resonant regime unrealistic, this could significantly enhance the signal. For true QCD axions, the resonances are generated by a derivative coupling, and hence strongly attenuated. However, this remains a relevant sector to investigate for ALP’s and scalar dark matter [1].
Second, being the Goldstone boson of the conformal group, the dilaton couples anomalously to the kinetic gauge operator. The similarities with the axion coupling to gauge bosons motivate our analysis of axion-dilaton models. The phenomenology of the dilaton has specific features as it emerges from a space-time symmetry. Yet, a correct understanding of axion-dilaton phenomenology can be enlightening both for the experimental search and for model building of such particles [2].

[1] Théo Brugeat and Christopher Smith, JHEP 01 (2025), 132, [arXiv:2412.06434 [hep-ph]]
[2] Théo Brugeat and Christopher Smith, in preparation.

Speaker: Théo BRUGEAT (cnr)

4 Entanglement Witnesses Mediated Via Axion-Like Particles

Entanglement is solely a quantum property and it can be extremely helpful to test the physics beyond the Standard Model in tabletop experiments with the advent of future quantum technologies. In this work, we provide an entanglement-based partial positive transpose (PPT) witness for Yukawa-type potentials in the infrared regime between pairs of neutral/charged particles in a spatial quantum superposition. The entanglement is created by the interaction beyond the Standard Model such as Axion-like particle (ALP) or physics motivated by string theory such as extra dimensions in the context of gravity. We will constrain the couplings along with the decoherence rate to show what parameters can be searched for in near future entanglement-driven experiments for the search of new physics.

Speaker: Anupam Mazumdar (Van Swinderen Institute, Univesrity of Groningen)

5 First searches for axion and dark photon dark matter with MADMAX

The MAgnetized Disk and Mirror Axion eXperiment (MADMAX) is a future experiment aiming to detect dark matter axions from the galactic halo by resonant conversion to photons in a strong magnetic field. It uses a novel concept based on a stack of dielectric disks in front of a mirror, called booster, to enhance the potential signal from axion-photon conversion over a significant mass range. In its final version, MADMAX aims to scan the uncharted QCD axion mass range from 40 to 400 mu-eV, favoured by post-inflationary theories.
Several small scale prototype systems have been tested these last three years, allowing to validate the dielectric haloscope concept and perform competitive axion and dark photon dark matter searches. This talk will present the current status of the experiment and its prototypes, including the results achieved so far, the ongoing research and development and the remaining challenges.

Speaker: Fabrice Hubaut (CPPM, Aix-Marseille Université, CNRS/IN2P3)

6 Liquid He tuning of dark matter axion haloscopes

Haloscopes are sensitive detectors used for dark matter axion search in the microwave energy range. They rely on the axion to photon conversion in a static magnetic field, and its amplification by resonance with a cavity electromagnetic mode. While simple cylinder cavities working below below 1 GHz can provide large volume detectors of typically a hundred liters or more (GrAHal-CAPP), searches at higher frequencies are plagued by the decrease of the cavity volume, hence of the detector sensitivity. Several strategies can be used to increase the mode frequency without a detrimental loss of volume, like using multiple (ADMX), meta-material filled (ALPHA) or dielectric (MADMAX) cavities. In each case the mode frequency tuning, necessary to scan broad axion mass ranges, is challenging.
In this contribution we report on the investigation of mode tuning by filling a cavity with liquid He at 4K. Applied to a simple cylinder cavity with its TM010 mode resonating close to 6 GHz, the dielectric constant of the liquid allows to tune the mode frequency over 120 MHz. We simulate and measure the mode localization induced by the non-homogeneity of the dielectric constant in the cavity during the filling. We show that a very good mode stability and controlled slow filling can be achieved. As an illustration, the results of an axion search in the 6,23-6,33 GHz range are presented. Finally, we discuss how the mode localization can be mitigated, and the new method used for more complex cavity designs and at lower temperatures using superfluid He.

Speaker: Mr Arthur Talarmin (CNRS Institut Néel)

7 Search for new physics in low energy electron recoil signals in LZ WS2022+2024 combined dataset

LUX-ZEPLIN (LZ) is a direct detection dark matter experiment located at the Sanford underground research facility in Lead, South Dakota, USA. LZ utilizes a dual-phase time projection chamber containing 7 tonnes of active xenon surrounded by veto systems to search for signals induced by WIMP dark matter candidates. Recently, the experiment announced world-leading WIMP results achieved over 280 live days of science operation. Besides its leading sensitivity to WIMPs, LZ is also sensitive to other dark matter candidates and new physics beyond the Standard Model using electronic recoil (ER) signatures. In this talk, I will present results of the LZ search for new physics leading to ER events based on an exposure of 4.2±0.1 tonne-years. Our search includes several models, including solar axion-like particles, hidden photons, mirror dark matter models, bosonic dark matter absorption, and the exotic electromagnetic interactions of solar neutrinos.

8 Searching for cosmic-ray antinuclei with the GAPS experiment

The General Anti-Particle Spectrometer (GAPS) is a long duration balloon experiment scheduled for its first launch from Antarctica during the austral summer of 2025-26, with a total of three planned flights. GAPS is optimized to detect cosmic-ray antinuclei at energies below 0.25 GeV per nucleon, a yet-unexplored energy regime with characteristically low astrophysical backgrounds. The experiment will measure the antiproton spectrum at lower energies and higher sensitivities than any previous detector, which will provide an interesting exploration into the potential antiproton excess. GAPS is also the first experiment sensitive to cosmic-ray antideuterons and antihelium in this energy range; antideuterons in particular are predicted by many dark matter models, but their backgrounds due to known astrophysical processes are so small that any detection would be a “smoking gun” indication of new physics.

GAPS uses a novel detection method involving exotic atom formation, de-excitation, and annihilation in order to identify antinuclei species. The innermost detector component is a silicon tracker, which acts as both the target nucleus for incoming antinuclei and an x-ray detector to measure de-excitation and annihilation products. The tracker is cooled by an oscillating heat pipe thermal system and surrounded on all sides by the time-of-flight (TOF) detector utilizing plastic scintillator material. The TOF performs precision timing measurements and provides the trigger for the experiment. The GAPS instrument is fully constructed and commissioned at NASA’s long-duration ballooning facility in Antarctica and is ready for launch as early as possible during the 2025-26 Antarctic balloon season. This talk will give an overview of the instrument and discuss potential science impacts of the GAPS program on dark matter research.

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16:00 Coffee break

Plenary

9 Highlights from flavor physics and rare decays

Speaker: Timothy Gershon (University of Warwick)

EPS Prize ceremony

18:30 Welcome reception

Tuesday 8 July

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10:30 Coffee break

Plenary

10 Highlights ATLAS

Speaker: Fabio Cerutti (LBNL)

11 Highlights CMS

Speaker: Roberto Salerno (LLR)

12 Standard Model/SMEFT, and Higgs Theory

Speaker: Ramona Groeber (University and INFN, Padova)

ERC funding

12:30 Lunch

Plenary

13 BSM Theory

Speaker: Riccardo Rattazzi (École polytechnique fédérale de Lausanne)

14 Quantum field and string theory

Speaker: Sascha Zhiboedov (CERN)

15 Highlights from Muon g-2

Speaker: Saskia Charity (University of Liverpool)

16 Highlights from KM3NeT

Speaker: Annarita Margiotta (University of Bologna and INFN Section Bologna)

16:00 Coffee break

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17 Blazar-boosted dark matter: a cosmic accelerator for dark matter particle detection

The search for dark matter (DM) remains one of the most pressing challenges in modern physics. Detecting sub-GeV DM particles poses significant challenges for traditional Earth-based detectors due to their low collision energies. This talk presents a novel approach to overcome these limitations: blazar-boosted dark matter (BBDM). I will explore how active galactic nuclei (AGN) with jets oriented towards Earth, known as blazars, can serve as cosmic particle accelerators for DM. Through interactions with hadronic matter in blazar jets, DM particles in the host galaxy's halo can be significantly accelerated, potentially reaching Earth with kinetic energies high enough for detection.

This presentation will cover the theoretical framework of BBDM, including blazar selection, modeling, and the upscattering mechanism in the DM halo. Additionally, I will present the first constraints on this framework using data from leading direct detection experiments, including XENON and LZ, demonstrating how these world-class detectors can probe this novel dark matter scenario. Notably, this is the first work that brings together experimental particle physicists, astrophysicists, and theoretical physicists, representing a cross-section of different disciplines. This approach allows us to explore the potential of BBDM, potentially opening new avenues for DM research.

Speaker: Laura Manenti (The University of Sydney)

18 Improving constraints on asymmetric dark matter from neutron stars

Fermionic asymmetric dark matter (ADM) can be captured in neutron stars (NS) via scatterings with the neutron star material. The absence of DM annihilations due to their asymmetric nature would thus lead to their accumulation in the NS core, which can exceed the Chandrasekhar limit to collapse into a black hole (BH), and provide exclusion limits from observations of neutron stars today. We compute the most up-to-date constraints on the ADM scattering rate and mass for a class of fermion DM models using improved capture, thermalization, BH accretion and evaporation rates, discussing the caveats and issues with approximations and assumptions used in the literature to derive these bounds. Our results show that some of the bounds can be significantly relaxed.

Speaker: Drona Vatsyayan (IFIC (UV-CSIC))

19 A dark matter direct detection search in DarkSide-20k

The DarkSide-20k detector, currently under construction at the INFN Gran Sasso National Laboratory in Italy, consists of a 51 tonne dual-phase Liquid Argon Time Projection Chamber aiming to directly detect GeV – TeV mass WIMPs. WIMPs are one of the most promising dark matter candidates, but no direct detection experiment has yet observed evidence sufficient to claim a WIMP discovery. Therefore, the parameter space yet to be explored is the focus of next-generation detectors such as DarkSide-20k. Building on the successful use of underground argon in the DarkSide-50 detector, DarkSide-20k is designed to be free of instrumental backgrounds. It aims to achieve unprecedented sensitivity for direct dark matter detection of 7.4 x10^-48 cm² for 1 TeV/c² WIMPs in a 200 tonne year exposure. Several novel technologies will be exploited, including the use of ultra-low radioactivity underground argon and large-area Silicon Photomultiplier readout. This talk will give an overview of the status of construction, discussing some of the novel technologies used in DarkSide-20k. This talk will also give an overview of the physics program of DarkSide-20k, highlighting recent low-mass sensitivity projections.

20 Results from and Status of the LUX-ZEPLIN Experiment

The LUX-ZEPLIN (LZ) experiment is a dark matter direct detection experiment operating almost a mile underground at the Sanford Underground Research Facility in Lead, South Dakota. LZ uses a 7 active-tonne dual-phase xenon time projection chamber primarily designed to detect weakly interacting massive particles (WIMPs), a well-motivated class of dark matter candidate. This talk will give the status of the LZ experiment, report on its latest dark matter results and discuss searches for other new physics phenomena.

Speaker: Amy Cottle (University College London)

21 Latest results from the XENONnT experiment

The XENONnT detector, located at the INFN Laboratori Nazionali del Gran Sasso in Italy, is a leading experiment in the search for dark matter in the form of Weakly Interacting Massive Particles (WIMPs). It features a dual-phase time projection chamber with a 5.9-tonne liquid xenon active target, designed to detect rare particle interactions. Owing to its low background environment, the scientific reach of XENONnT extends beyond WIMP searches to include rare event studies such as bosonic dark matter, solar axions, rare nuclear decays, and solar neutrinos. In this talk, I will present recent results on the first observation of Boron-8 solar neutrinos via coherent elastic neutrino-nucleus scattering (CEνNS), as well as the latest findings from the WIMP search with XENONnT.

Speaker: Paloma Cimental Chavez

22 Recent Results from PICO-40L and the Future of the PICO Dark Matter Search

The PICO collaboration operates bubble chambers to search for WIMP dark matter, leveraging the excellent gamma rejection and long live fractions enabled by operating at a lower degree of superheat than the bubble chambers of the 1960s. This advancement allows for significantly improved background rejection while maintaining sensitivity to nuclear recoils. Located at the SNOLAB underground laboratory, these detectors use fluorinated target fluids optimized for probing spin-dependent WIMP-proton interactions.

Previous experiments, PICO-2L and PICO-60, set the world’s strongest constraints on spin-dependent WIMP-proton scattering. The next-generation detector, PICO-40L, is now fully operational and actively collecting physics data. Its superheated C3F8 target provides an ideal medium to achieve world-leading sensitivity in this search. This talk will provide an overview of the detector design, analysis strategy, and initial physics results. Looking ahead, PICO-500, a 250-liter chamber currently in development, is expected to begin commissioning in 2026, further advancing the search for dark matter.

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20:00 Public event - Art & Science

For more details, please refer to the EPS-HEP 2025 outreach page

Wednesday 9 July

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23 Constraining self-interacting scalar field dark matter with strong gravitational lensing?

We present a method to investigate the properties of solitonic cores in the Thomas-Fermi regime under the self-interacting scalar field dark matter framework. Using semi-analytical techniques, we characterize soliton signatures through their density profiles, gravitational lensing deflection angles, and surface mass density excess in the context of strong lensing by galaxy clusters. Focusing on halos spanning two mass scales — $M_{200}=2⋅10^{15}M_⊙$ and $2⋅10^{14}M_⊙$ — we compute lensing observables to assess the viability of the SFDM model. Our analysis establishes constraints on the soliton core mass, directly probing the self-interaction parameter space of scalar field dark matter. This work bridges semi-analytical predictions with astrophysical observations, offering a lensing-based framework to test ultralight dark matter scenarios in galaxy cluster environments.

24 GeV scale strongly-interacting dark sectors at beam dump experiments

A natural dark matter candidate in many theories of strongly-interacting dark sectors is the dark pion $\pi_D$, which is a composite particle that is expected to have a mass close to or below the GeV scale. In many cases, these theories also contain a light vector meson, $\rho_D$ , that can be produced together with dark pions through dark showers created in particle collisions. Cosmological and astrophysical arguments favor the scenario $m_{\rho_D} < 2m_{\pi_D}$, which implies visible decays of the $\rho_D$ mesons and makes the model testable at accelerators. In this talk I will show that beam-dump experiments sensitive to feebly-interacting long-lived particles can be a valuable tool for probing such strongly-interacting dark sectors and present the projected sensitivity of the upcoming SHiP experiment.

Speaker: Nicoline Hemme (KIT)

25 ANUBIS: Projected Sensitivities and Initial Results from the proANUBIS demonstrator with Run 3 LHC data

Despite the success of the Standard Model (SM) there remains behaviour it cannot describe, in particular the presence of non-interacting Dark Matter. Many models that describe dark matter can generically introduce exotic Long-Lived Particles (LLPs). The proposed ANUBIS experiment is designed to search for these LLPs within the ATLAS detector cavern, located approximately 20-30 m from the IP. A prototype detector, proANUBIS, has taken data within the ATLAS detector cavern since 2024, corresponding to 104 fb-1 of pp data. We report on the potential sensitivity of ANUBIS to a selection of LLP models, i.e. Higgs Portal and Heavy Neutral Leptons, as well as future planned studies. Additionally, we will show the first results of the proANUBIS demonstrator, and how it will be used to study the expected backgrounds for the ANUBIS detector.

26 COmpact DEtector for EXotics at LHCb: CODEX-b

The COmpact DEtector for EXotics at LHCb (CODEX-b) is a particle physics detector dedicated to displaced decays of exotic long-lived particles (LLPs), compelling signatures of dark sectors Beyond the Standard Model, which arise in theories containing a hierarchy of scales and small parameters. The CODEX-b detector is a cube with 10m per side with two internal sections, planned to be installed near the LHCb interaction point. It is built of a new generation of high performance RPCs triplet chambers, derived from the ATLAS upgrade RPC technology, providing a space x time resolution of a few mm x 300 ps per individual detector layer. It will have a near-zero background environment, hence complementing the new-searches program of other detectors like ATLAS or CMS. A demonstrator detector, CODEX-𝛽, has been installed to take data beginning in 2025. It will validate the design and physics case for the future CODEX-b. CODEX-𝛽 will be responsible for validating the background estimations for CODEX-b, demonstrating integration in the LHCb readout system, and showing the suitability of the baseline tracking and its mechanical support. This talk will present the latest developments and will focus on the status and plans for CODEX-𝛽.

Speaker: Vladimir GLIGOROV (LPNHE)

27 FORMOSA: looking forward to millicharged particles at the LHC

The FORMOSA detector at the proposed Forward Physics Facility is a scintillator-based experiment designed to search for signatures of "millicharged particles" produced in the forward region of the LHC. This talk will cover the challenges and impressive sensitivity of the FORMOSA detector, expected to extend current limits by over an order of magnitude. A pathfinder experiment, the FORMOSA demonstrator, was installed in the FASER cavern at the LHC in early 2024 and has been collecting collisional data. Results from this demonstrator and important implications for the full detector design will be shown.

28 Lohengrin — a proposed experiment in the search for dark bremsstrahlung and a portal to the dark sector

The non-discovery of WIMPs at the LHC and the negative outcome of direct detection experiments have led to a steadily increasing interest in models with light dark matter. Models with a dark matter candidate that has a mass below the Lee-Weinberg bound can predict the right dark matter relic density if a new gauge interaction is introduced in addition to the dark matter candidate. The new gauge boson couples predominantly to the dark matter particle (and possibly other particles), but also acts as a portal to the dark sector in these models thanks to a feeble coupling $\varepsilon$ to the standard model.
Dark photons $A'$, massive gauge bosons of a new broken $U(1)_D$ interaction are a prominent example for such a new gauge boson. The dark photon can mix kinetically with the standard model photon, enabling the thermal freeze-out of dark matter particles with masses well below the Lee-Weinberg bound.
Dark photons can be produced in a process called dark bremsstrahlung, for example by shooting a beam of electrons onto a thick target. In this contribution we present the proposal for an experiment at the ELSA accelerator in Bonn that will search for the production of dark bremsstrahlung: the Lohengrin experiment.
A beam of 3.2 GeV electrons is directed onto a tungsten target, placed in a strong magnetic field in the center of a tracking detector that is used for triggering and track reconstruction. Signal events are characterized by a low energy electron and a significant amount of missing momentum and energy in the final state. A fast electromagnetic calorimeter is placed behind the tracking volume to efficiently veto events with standard model bremsstrahlung. A hadron veto is used to discard events with electron-nuclear or photon-nuclear interactions producing neutral hadrons. In order to reach the sensitivity to cosmologically relevant regions in the $m_{A'}-\varepsilon$ parameter space, the key properties of the experiment are 1) a high rate of incoming electrons and 2) a highly efficient background rejection at the order of $10^(-12)$.
We will demonstrate the feasibility of the Lohengrin experiment using next-generation tracking detectors and calorimeters, and will show that the proposed experiment has the potential to conclusively probe the dark photon parameter space for dark photon masses between ~1 MeV and ~50 MeV, an interval that is not currently covered by any existing experiments.

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10:30 Coffee break

Plenary

29 Dark Matter theory

Speaker: Laura Lopez Honorez (Université Libre de Bruxelles)

30 Cosmology

Speaker: Camille Bonvin (University of Geneva)

31 Dark Matter and Axion searches

Speaker: Clara Murgui Galvez (CERN)

12:30 Lunch

Plenary

32 Recent results in Standard Model Physics

Speaker: Josh Bendavid (CERN)

33 Highlights LHCb

Speaker: Vladimir GLIGOROV (LPNHE)

34 Quarks and Leptons flavour theory

Speaker: Sophie Renner (University of Glasgow)

35 Highlights Belle and Belle II

Speaker: Karim Trabelsi (TYL - KEK)

15:30 Coffee break

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36 Radion Portal Dark Matter in Stabilized Warped Extra-Dimensions

We analyze dark matter (DM) annihilation in a stabilised Randall-Sundrum (RS) model, where the radion—the lightest spin-0 Kaluza-Klein state—acts as a portal between DM and the Standard Model (SM).

By recasting limits from axion-diphoton couplings and collider searches for spin-0 resonances, we constrain the radion’s parameter space and demonstrate that Weakly Interacting Massive Particles (WIMPs) in the 100–500 GeV mass range can satisfy the observed relic abundance while evading direct detection and collider bounds.

Furthermore, the theoretical framework of RS models mandates a sub-TeV radion mass, ergo distinguishing it from ad-hoc dilaton portals where the radion mass is a free parameter.

37 Search for Dark Matter in 2HDM+complex singlet at LHC and future Lepton Colliders

We investigate the phenomenological prospects of the Two Higgs Doublet and Complex Singlet Scalar Extension (2HDMS) in the context of dark matter (DM) and Higgs phenomenology. The 2HDMS provides an enlarged Higgs sector along with a DM candidate. In this work, we perform an exhaustive scan to find representative benchmarks which are consistent with all theoretical and experimental constraints. We choose benchmarks with light, intermediate and massive DM masses and in some cases, also accommodate the 95 GeV excess in $b\bar{b}$ and $\gamma\gamma$ channels observed at the Large Electron-Positron Collider (LEP) and Large Hadron Collider (LHC). We focus on the relevant signatures at the LHC and at proposed future lepton colliders, including electron-positron and muon colliders. Using a cut and count analysis, we show that while the High Luminosity LHC (HL-LHC) may give a hint of new physics, future lepton colliders prove to be efficient discovery probes for the 2HDMS.

Speaker: JAYITA LAHIRI (II. Theoretical Institute for Physics, University of Hamburg)

38 Revised phenomenology of new physics particles in GeV mass range

In this talk, I explore minimal extensions of the Standard Model that introduce new particles in the GeV mass range, with a particular focus on how they can be probed at proton accelerator experiments such as the recently approved SHiP. I present a comprehensive analysis of the phenomenology of new particles, highlighting overlooked inconsistencies in the literature as well as key theoretical uncertainties. I then show how these uncertainties substantially impact both the existing constraints on the parameter space and the reach of future experimental searches.

Speaker: Maksym Ovchnynikov (CERN)

39 Searches for dark matter with CMS in mono-X signatures

Determination of the nature of dark matter is one of the most fundamental problems of particle physics and cosmology. This talk presents recent searches for dark matter particles from the CMS experiment at the Large Hadron Collider in mono-X signatures.

Speaker: CMS Collaboration

40 Search for dark sector at BESIII

The BESIII experiment is taking data at a symmetric $e^+e^-$ collider operating at the center of mass energies from 2.0 to 4.95 GeV. With the world’s largest on-threshold production data set of $J/\psi$ (10 billion), $\psi$(3686) (2.6 billion), and 20 $fb^{-1}$ of $\psi(3770)$ decaying into D meson pairs, we are able to search for various dark sectors particles produced in $e^+e^-$ annihilation and meson decay processes. In this talk, we report the search for BSM particles in $\Sigma$ decay and Axion-like particle search with $J/\psi$ data. The search for massless dark photon through the FCNC process $D^0 \to \omega \gamma’$ and $D^0 \to \gamma \gamma’$, and $K_s^0$ invisible decay will also be presented.

Speaker: Zhijun Li (Sun Yat-sen University)

41 Searches for displaced Scalar decays to dimuons: LHCb’s extended reach in Run 3

A detailed study exploiting novel trigger and reconstruction techniques developed to search for Beyond Standard Model (BSM) Long-Lived Particles (LLPs) with very displaced vertices is presented. Building on feasibility studies that have successfully reconstructed Standard Model decays occurring up to 8m forward of the interaction point in LHCb’s magnet region, the search for LLP particles into charged final states exploits LHCb’s unique forward geometry and segmented tracking system—comprising the Vertex Locator, Upstream Tracker, and SciFi stations—to extend sensitivity into previously inaccessible regions.

The presentation will cover innovative trigger strategies implemented in LHCb’s software trigger for inclusively selecting very displaced dimuon pairs, alongside advanced offline selection methods utilising multivariate analysis methods to robustly suppress background while maintaining high signal efficiency. Preliminary sensitivity estimates for Dark Higgs -> mu mu search indicate that these approaches can achieve competitive performance compared to dedicated LLP experiments. Future prospects will also be discussed. This work aims to provide a comprehensive framework for enhancing LLP discovery potential at LHCb and offers insights that could be beneficial for the broader BSM LLP search community.

42 How LHCb is shedding light on the existence of dark sector portals

Although suggested by cosmological and astrophysical observables, no dark matter candidate has been observed to date. Potential mediators between the visible and dark sectors are receiving more and more attention since they offer the opportunity of discovering the nature of dark matter at collider experiments. The LHCb experiment, originally built for $b$- and $c$-physics, has proven to be uniquely sensitive to low-mass resonances. A focus is set on the search for Dark Photons in leptonic decays, hidden-sector bosons, and the newly published search for axion-like-particles. The prospects for those searches with the large Run 3 dataset will be shown as well.

43 Searches for dark sector particles at Belle and Belle II

The Belle and Belle II experiment have collected samples of $e^+e^-$ collision data at centre-of-mass energies near the $\Upsilon(nS)$ resonances. These data have constrained kinematics and low multiplicity, which allow searches for dark sector particles in the mass range from a few MeV to 10 GeV. Using a 365 fb$^{-1}$ sample collected by Belle II, we search for inelastic dark matter and an $Z^{\prime}$ that decays to invisible particles. Using a 711 fb$^{-1}$ sample collected by Belle, we search for $B\to h + \mathrm{invisible}$ decays, where $h$ is a $\pi$, $K$, $D$, $D_{s}$ or $p$, and $B\to Ka$, where $a$ is an axion-like particle.

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18:00 Poster session - all posters in the same place at the same time

The list of posters attached to each track is available by clicking on the blocks on the right.

Poster T01

Poster T02

44 Exploring the Projected Sensitivity of the ANUBIS detector to exotic LLP models

Despite the success of the Standard Model (SM) there remains behaviour it cannot describe, in particular the presence of non-interacting Dark Matter, which composes a significant fraction of the Universe’s matter. Many models that describe dark matter can generically introduce exotic Long-Lived Particles (LLPs). The proposed ANUBIS experiment is designed to search for these LLPs within the ATLAS detector cavern alongside the ATLAS detector, located approximately 20-30 m from the IP. We report on the potential sensitivity of ANUBIS to a selection of LLP models, i.e. Higgs Portal and Heavy Neutral Leptons, as well as future planned studies.

Speakers: Oleg Brandt (U. Heidelberg, Kirchhoff Institute for Physics), Paul Swallow (University of Cambridge), Théo REYMERMIER (IP2I Lyon + LPSC)

45 Feasibility to probe the dynamical scotogenic model at the LHC

In this talk (poster), we perform a feasibility study to probe dark matter production at the LHC, using a $U_L(1)$ scotogenic model. The study is conducted considering the viable parameter space of the model allowed by experimental constraints such as neutrino masses, the Higgs to invisible branching fraction, and dark matter observables. The analysis is carried out using the Markov Chain Monte Carlo numerical method. The production of scalar and fermionic dark matter candidates, predicted by the model, is then studied under the LHC conditions for different luminosity scenarios imposing compressed mass spectra conditions between the lightest fermion and the $\mathbb{Z}_2$ odd scalar masses. We studied two production mechanisms, Drell-Yan and Vector Boson Fusion and analyzed their production cross sections within the LHC framework.

Speaker: Gustavo Adolfo Ardila Tafurth (Universidad de los Andes (CO))

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Poster T15

20:00 Public lecture

For more details, please refer to the EPS-HEP 2025 outreach page

Thursday 10 July

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46 New Directions in Inelastic Dark Matter

Models of inelastic (or pseudo-Dirac) dark matter commonly assume an accidental symmetry between the left-handed and right-handed mass terms in order to suppress diagonal couplings. Moreover, they often introduce a gauge symmetry spontaneously broken by the introduction of a dark sector version of the Higgs mechanism. Removing the requirement of such an accidental ad-hoc symmetry instead relaxes the relic density constraint and provides a smooth transition between pseudo-Dirac and Majorana dark matter. It also allows for a minimal definition of inelastic dark matter models in which only a real scalar field is required along the pseudo-Dirac particle.

In the talk, I will introduce a simple UV-complete framework realizing the new asymmetric set-up. I discuss the viable regions of parameter space still solving the dark matter problem and comment on how they could be probed with future experiments.

Speaker: Giovani Dalla Valle Garcia (IAP - KIT)

47 Neutrino constraints on inelastic dark matter captured in the Sun

We study the possibility for large volume underground neutrino experiments
to detect the neutrino flux from captured inelastic dark matter in the Sun.
The neutrino spectrum has two components: a mono-energetic "spike" from
pion and kaon decays at rest and a broad-spectrum "shoulder" from prompt
primary meson decays. We focus on detecting the shoulder neutrinos
from annihilation of hadrophilic inelastic dark matter with masses in the
range 4-100 GeV. We find the region of parameter space that these
neutrino experiments are more sensitive to than the direct-detection
experiments. For dark matter annihilation to heavy-quarks, the projected
sensitivity of DUNE is weaker than current (future) Super (Hyper) Kamiokande
experiments, while for the light-quark channel, only the spike is
observable and DUNE will be the most sensitive experiment.

Speaker: Ina Sarcevic (University of Arizona)

48 The SABRE South Experiment at the Stawell Underground Physics Laboratory

SABRE is an international collaboration that will operate similar particle detectors in the Northern (SABRE North) and Southern Hemispheres (SABRE South). This innovative approach distinguishes possible dark matter signals from seasonal backgrounds, a pioneering strategy only possible with a southern hemisphere experiment. SABRE South is located at the Stawell Underground Physics Laboratory (SUPL), in regional Victoria, Australia.
SUPL is a newly built facility located 1024 m underground (∼2900 m water equivalent) within the Stawell Gold Mine and its construction has been completed in 2023.
SABRE South employs ultra-high purity NaI(Tl) crystals immersed in a Linear Alkyl Benzene (LAB) based liquid scintillator veto, enveloped by passive steel and polyethylene shielding alongside a plastic scintillator muon veto. Significant progress has been made in the procurement, testing, and preparation of equipment for installation of SABRE South. The SABRE South muon detector and the data acquisition systems are actively collecting data at SUPL and the SABRE South’s commissioning is planned to be completed by the end of 2025.
This presentation will provide an update on the overall progress of the SABRE South construction, its anticipated performance, and its potential physics reach.

Speaker: Irene Bolognino (The University of Adelaide, Adelaide, SA 5005, Australia. ARC Centre of Excellence for Dark Matter Particle Physics, Australia.)

49 The CYGNO experiment, a Gaseous TPC for directional Dark Matter searches

The CYGNO/INITIUM project introduces an innovative approach to directional Dark Matter detection using a gaseous Time Projection Chamber (TPC). Targeting low mass (0.5-50 GeV) WIMPs-like Dark Matter, the experiment uses a He/CF4 gas mixture sensitive to both spin-dependent and spin-independent interactions at atmospheric pressure with optical readout. Building on the success of our 50 L prototype, LIME, we aim to deploy a 0.4 m³ demonstrator, CYGNO04, at Laboratori Nazionali del Gran Sasso (LNGS) between 20245 and 2026 to validate the technology's performance and scalability.
In CYGNO detectors, particle interactions ionize the gas, creating electrons that drift to the amplification stage, consisting of three Gas Electron Multipliers (GEMs). The readout system combines a scientific CMOS (sCMOS) camera and Photomultiplier Tubes (PMTs) to detect light produced during electron avalanches. This light is captured in a two-dimensional (X-Y) projection by the sCMOS camera and a time profile (dZ) by the PMTs, enabling 3D reconstruction of ionizing events. High granularity and rapid response allow detailed energy deposition mapping, supporting topology, directional, and head-to-tail recognition.
Results from LIME, which conducted data taking at the underground LNGS labs, show significant advancements in particle identification and 3D tracking capabilities.
Recent progress on the CYGNO-04 status will be presented, highlighting its role in the project's future. The CYGNO/INITIUM project will contribute substantially to Dark Matter detection, and the possibility that this same detector could perform neutrino measurements sets the stage for future large-scale experiments.

50 The CRESST experiment for Light Dark Matter Search

The CRESST (Cryogenic Rare Event Search with Supercoduncting Thermometers) experiment located in the underground facility of the Laboratori Nazionali del Gran Sasso (LNGS) aims to measure dark matter particles through their elastic scattering off nuclei in scintillating crystals. The target crystals are equipped with Transition Edge Sensor (TES) thermometers and operated at mK temperature as cryogenic calorimeters. CRESST achieved outstandingly low nuclear recoil thresholds (~10 eV) yielding world-leading sensitivity for light dark matter particles for mass below 1.7 GeV/$c^2$.The current sensitivity is limited by an excess of events rising exponentially below the 200 eV, known as the Low Energy Excess (LEE), whose origin remains unclear. The most recent results, together with future plans will be presented and discussed.

51 Light Dark Matter Searches with Spherical Proportional Counters

The particle nature of dark matter remains a key unanswered questions in modern physics, despite it making up the majority of matter in the universe. The NEWS-G collaboration is searching for light dark matter candidates using a gaseous detector, the spherical proportional counter. The use of light gaseous targets, including H, He, Ne, etc., combined with a low energy threshold, enable access to the mass range from 0.05 to 10 GeV. The detector’s simple design also facilitates radio-pure detector construction. The collaboration currently operates a 140$\;$cm in diameter detector, constructed at the Modane Underground Laboratory (LSM) using 4N copper with 500 $\mu\text{m}$ electroplated inner layer. The first direct dark matter search with this detector using a methane target will be presented, as will ongoing searches performed at SNOLAB. The potential to achieve sensitivity reaching the neutrino floor in light dark matter searches with a next generation, fully underground electroformed detector, DarkSPHERE,  situated in the Boulby Underground Laboratory, will also be presented. Current efforts underway towards DarkSPHERE will be discussed, for example, establishing a high-purity copper electroforming facility in Boulby.

Speaker: Patrick Knights (University of Birmingham)

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10:30 Coffee break

Plenary

52 Experimental Neutrino Physics

Speaker: Kate Scholberg (Duke University)

53 Neutrino Theory

Speaker: Enrique Fernandez-Martinez (IFT Madrid)

54 Sustainability in HEP

Speaker: Maxim Titov (IRFU, CEA, Université Paris-Saclay)

12:30 Lunch

Plenary

55 LHC status

Speaker: Helga Timko (CERN)

56 Accelerator R&D

Speaker: Mike Seidel

57 Detector R&D and computing

Speaker: Chris Parkes (University of Glasgow)

15:30 Coffee break

ECFA Plenary

20:00 Conference dinner

For more details, please refer to the EPS-HEP 2025 general information page, section "Food and drinks"

Friday 11 July

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58 keV sterile neutrino dark matter together with large neutrino mass in cosmology from a dark sector

We investigate the phenomenology of a dark sector, extension of the neutrino sector, that simultaneously provides a viable dark matter (DM) candidate, reconciles cosmological constraints with active neutrino masses possibly measurable in laboratories such as KATRIN, and yields near-future testable predictions.
The dark sector comes into thermal equilibrium with Standard Model neutrinos after neutrino decoupling and before recombination via a new $U(1)$ gauge interaction in the dark sector. It contains a sterile neutrino DM candidate with mass in the $\mathcal{O}(10 - 100){\rm keV}$ range, along with a large number of massless fermions that dilute the abundance of active neutrinos. This dilution allows for larger neutrino masses without conflicting with cosmological bounds. The DM relic abundance is determined by freeze-out within the dark sector, naturally avoiding X-ray constraints.
A key prediction of this framework is a small increase in the effective number of relativistic species, $N_{\rm eff}$, at recombination, within the sensitivity of upcoming CMB experiments - making the scenario experimentally accessible and testable in the near future.

Speaker: Cristina Benso (Karlsruhe Institute of Technology (KIT))

59 Constraints on the Dark Sector from Electroweak Precision Observables

The dark photon is a popular choice when considering a portal between the Standard Model and the dark sector. In this work, we revisit the exclusion constraints on the dark photon, using the latest electroweak precision data from the Particle Data Group, and explore the impact on these constraints due to the CDF measurement of the W boson mass. In addition, we set upper bounds directly on dark photon couplings to dark matter particles, focusing on Dirac fermion and scalar scenarios. We also extend relic abundance constraints into the heavy mass region, and identify regions of parameter space that are consistent with both electroweak and dark matter density constraints.

Speaker: Bill Loizos (Adelaide University)

60 Long lived particle searches at FASER

The FASER experiment at the LHC is designed to search for light, weakly-coupled new particles, and to study high-energy neutrinos. The experiment has been running since 2022, and has collected nearly 200/fb of pp collision data. FASER has released a search for long-lived dark photons, and long lived axion-like-particles (also interpreted in several other scenarios). This talk will summarise the long-lived BSM particle search program and discuss future prospects.

61 Search for $B$ Mesogenesis and Dark matter at $BABAR$.

We present the most recent $BABAR$ searches for reactions that could simultaneously explain the presence of dark matter and the matter-antimatter asymmetry in the Universe. This scenario predicts exotic $B$-meson decays into an ordinary-matter baryon and a dark-sector anti-baryon $\psi_D$ with branching fractions accessible at the $B$ factories.
The results are based on the full data set of about 430 $\text{fb}^{-1}$ collected at the $\Upsilon(4S)$ resonance by the $BABAR$ detector at the PEP-II collider.
We search, in particular, for decays like $B\to\psi_{D} {\cal B}$ where $\cal{B}$ is a baryon (proton, $\Lambda$, or $\Lambda_c$). The hadronic recoil method has been applied with one of the $B$ mesons from $\Upsilon(4S)$ decay fully reconstructed, while only one baryon is present in the signal $B$-meson side. The missing mass of signal $B$ meson is considered as the mass of the dark particle $\psi_{D}$. Stringent upper limits on the decay branching fraction are derived for $\psi_D$ masses between 0.5 and 4.3 GeV/c$^2$.

62 Status of the MilliQan Experiment during Run 3

The MilliQan experiment is an ongoing search for millicharged particles (mCPs), which arise naturally in many Dark Sector models which offer potential Dark Matter candidates. The experiment is located just above the CMS experiment at the LHC and leverages this proximity along shielding from most standard model backgrounds to gain sensitivity to mCPs in the mass range of $0.01-45\ \mathrm{GeV}$, while having sensitivity to charges as low as $0.003e$. Two detector designs have been implemented to achieve this wide range of sensitivity, one detector featuring long scintillating bars for low charge/mass points, and the other utilizing wide scintillating slabs for high mass and high charge.

The bar detector has taken data for about two years, corresponding to more than $140\ \mathrm{fb}^{-1}$ of recorded luminosity. Over the summer of 2024 the slab detector was fully assembled and commissioning has been ongoing. Measurements of beam muons produced at the CMS interaction point with the slab detector have been made and compared with cosmic ray showers for validation.

The current status of the experiment will be presented, including a look at 2024 bar detector data. In addition, recent commissioning results of the slab detector will be discussed in relation to the slab detector's early data taken in 2025.

Speaker: Juan Salvador Tafoya Vargas (University of California Davis (US))

63 The DarkSide-20k experiment for WIMPs direct detection and its Photon Detection System

Representing approximately 85% of the Universe’s total mass, dark matter remains one of the greatest mysteries in physics. Even though evidences supporting its existence accumulate, its true nature is still unknown. A leading group of dark matter candidates is Weakly Interacting Massive Particles (WIMPs). The search for WIMPs has been an ongoing experimental challenge for over a decade, continually pushing the boundaries of detection limits. The DarkSide program is part of this direct detection effort and will advance with its next-generation experiment, DarkSide-20k.

The DarkSide-20k detector will feature a dual-phase liquid argon time projection chamber (LArTPC) enclosed within two veto systems, all housed inside an 8×8×8 m³ cryostat. Located in the Gran Sasso underground laboratory, the experiment benefits from natural shielding against cosmic rays. The detector is designed to minimize background noise and achieve a nearly background-free operation by employing strategies to suppress unwanted signals such as neutrons, beta particles, and gamma rays. This is made possible by liquid argon's exceptional background rejection capability, particularly through pulse shape discrimination.

A key component of the detector is the Photon Detection Units (PDUs), which are curently in production. The project will utilize cryogenic and low-background silicon photomultipliers (SiPMs), which will undergo rigorous testing before being assembled into PDUs at the Nuova Officina Assergi (NOA) cleanroom, located in the external facility near the underground site. These advancements will enable DarkSide-20k to achieve unprecedented sensitivity to the WIMP-nucleon cross-section, probing previously unexplored regions of parameter space.

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64 Outreach, Education and EDI

Speaker: Kate Shaw (University of Sussex (GB))

65 QCD, Jets & Monte Carlo tools

Speaker: Gregory Soyez (Institut de Physique Théorique, CNRS)

66 Calculational techniques in particle theory

Speaker: Yael Shadmi (Technion - Israel Institute of Technology)

12:30 Lunch

Plenary

67 Highlights ALICE

Speaker: Igor Altsybeev (Technische Universität München)

68 Heavy Ions: Theory

Speaker: Urs Wiedemann (CERN)

69 Heavy Ions: Experiments

Speaker: Francesco Prino (INFN, Sezione di Torino)

70 Artificial Intelligence for HEP

Speaker: Kyle Cranmer (University of Wisconsin-Madison)

16:00 Coffee break

Plenary

71 Searches for New Physics at the LHC

Speaker: Tamara Vazquez Schröder (Institut de Física d’Altes Energies (IFAE))

72 Gravitational Waves

Speaker: Antoine Petiteau (Institut sur les lois fondamentales de l'Univers (CEA/IRFU))

73 Conference summary

Speaker: Andreas Hoecker (CERN)

Closing words & Farewell