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Giulia DI GREGORIO (IJCLab)01/12/2025 09:00
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Timoty Duong01/12/2025 09:30Standard Model
Electron triggers are responsible for selecting events resulting of proton-proton collisions at the Large Hadron Collider and their performance is a key ingredient for many physics analyses with the ATLAS detector. This work presents recent studies of Run3 electron trigger efficiencies and the corresponding scale factors, which correct for small differences between data and simulated events....
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David Rousseau, Louis Fayard, Zirui Liu (IJCLab)01/12/2025 09:55
The ATLAS experiment has published measurement of Higgs trilinear self-coupling with LHC Run 2 + partial Run 3 data, reaching a range of -1.7 < $\kappa_{\lambda}$ < 6.6 ; but the core algorithm for statictical inference is a $m_{\gamma\gamma}$ histogram-based fit, which is not optimal given the $\kappa_{\lambda}$ is non-linear to the signal strength. Motivated by the drawback of histogram...
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Andrés Duque (Laboratoire de Physique de Clermont Auvergne)01/12/2025 10:50Standard Model
In high-energy collisions, jets, which are collimated sprays of particles, can originate from various fundamental particles, including W and Z bosons, top quarks, and the Higgs boson. Accurately identifying these jets is crucial for studying Standard Model processes and investigating new physics beyond its framework. This study, conducted within the ATLAS collaboration at the Large Hadron...
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Inès Combes (Université Paris-Saclay (IJCLab))01/12/2025 11:15Standard Model
The Higgs boson pair production (HH) takes center stage in the LHC physics program. Vector Boson Fusion (VBF), the second largest production mode of HH, represents a probe to the Higgs boson doublet structure in the Standard Model and to physics beyond it. Studying HH via VBF is particularly interesting in the boosted topology which is sensitive to anomalous couplings of two Higgs bosons to...
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Léonardo SPLENDORI (CPPM, Aix-Marseille Université, CNRS/IN2P3 (FR))01/12/2025 11:40Standard Model
The upcoming High Luminosity LHC (HL-LHC) era is expected to bring opportunities for studies involving rare processes, including di-Higgs production. Flavour tagging is going to play a crucial role in the analysis of such processes. This talk will explore the challenges we expect to encounter for flavour tagging in the HL-LHC era, with its higher luminosity, increased pile-up and upgraded...
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Katerina Kazakova (CPPM, Aix-Marseille Université, CNRS/IN2P3 (FR))01/12/2025 12:05Standard Model
The search for non-resonant Higgs boson pair production provides an important probe to the Higgs self-coupling and thus the electroweak symmetry breaking mechanism. The HH $\rightarrow bb\gamma\gamma$ channel is one of the most sensitive channels in the search for di-Higgs bosons. The search performed with Run2 and partial Run3 data collected by the ATLAS experiment with the unprecedented...
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Olivier SALIN (Université Paris-Saclay)01/12/2025 13:55Standard Model
Vector boson scattering processes are precision probes of the electroweak sector and provide strong sensitivity to new physics that affects gauge and Higgs couplings. Although VBS cross sections in the Standard Model are small, these processes have been observed at the Large Hadron Collider by the ATLAS and CMS experiments. The semi leptonic final state, where one boson decays hadronically to...
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Mathis Dubau (LAPP)01/12/2025 14:20Standard Model
My thesis subject is the study of the polarisation of electroweak gauge bosons. The longitudinally polarised state is highly correlated to the Goldstone boson, so before the electroweak symmetry breaking, thus allows us to test the limit of the Standard Model prediction. The challenge of this observation of simultaneously produced bosons, called Vector Boson Scattering, is the very low...
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Panagiotis Ziakas (L.A.P.P.)01/12/2025 14:45Standard Model
This presentation summarises the work I have done so far for my PhD. First, the presentation introduces the audience to the VBS process, why it is important and what is its signature in the detector. Then, it proceeds with the QCD background modelling studies that were performed using the MG5_aMC@NLO MC generator. Moreover, it briefly discusses the work I have been doing for my Qualification...
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Cyril Eschenlauer01/12/2025 15:10Standard Model
The CMS collaboration, which analyzes proton-proton collisions at CERN's Large Hadron Collider (LHC), has measured the tau leptons polarization from the decay of Z bosons with LHC Run 2 data from 2016. The polarization (helicity asymmetry) measures the different couplings of the Z boson to left- and right-handed fermions due to its electroweak nature and allows a determination of the effective...
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Vitalii Lisovskyi (Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France)01/12/2025 15:35
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Mattia Marfoli (Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France)01/12/2025 16:35Flavor Physics
Processes involving Flavor Changing Neutral Currents (FCNC), where a B meson undergoes decay into a pair of oppositely charged leptons, serve as potent avenues in the exploration of physics beyond the Standard Model (SM). Notably, the decay $B \to \mu^+ \mu^-$ has been observed by LHC experiments, and its measured branching fraction (BF) aligns with the SM prediction, thereby imposing rigorous...
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Willy WEBER (LPCA), Willy WEBER (LPCA)01/12/2025 17:00Flavor Physics
The Future Circular Collider (FCC-ee) is a proposed electron-positron collider designed to enable high-energy collisions at unmatched scales. It is expected to produce $O(10^{12})$ $Z \to q\bar{q}$ events, significantly enhancing our ability to perform precision measurements of electroweak observables. So far, LHCb has measured CP violation in $D^0$ decays to charged particles....
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Kylian DEMORY (IJClab)01/12/2025 17:25Flavor Physics
The g-2 of the muon is one of the oldest (longstanding) potential anomalies in the standard model, although recent theoretical developements synthesized by the g-2 theory initiative and the most precise measurements carried out at Fermilab contributed to a shift in the field's landscape. However, tensions persist and are still very much unresolved in the data driven approach, with recent...
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Laetitia Guerry01/12/2025 17:50Flavor Physics
The Standard Model of Particle Physics explains successfully the fundamental interactions between particles of ordinary matter. However, it is incomplete, as it cannot explain neutrino masses nor cosmological observations such as matter-antimatter asymmetry in the Universe or the origin of dark matter. Physics beyond the Standard Model is either searched for production of new particles via...
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Federica BRADASCIO (IJCLab, Université Paris-Saclay)02/12/2025 09:20
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Chloé Barjou-Delayre02/12/2025 09:50Cosmology
The cosmological principle assumes the isotropy of the Universe. The high coverage of the Zwicky Transient Facility survey (ZTF) makes it possible to carry out an unprecedented study of the veracity of this principle by using observation of type Ia supernovae (SNe Ia).
This unique low redshift (z<0.15) survey with more than 3000 SNe Ia in the second data release (ZTF-DR2-SNe Ia) increases...
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Pierre Pichard (APC)02/12/2025 10:45Astroparticle
Développée dans les années 1980, l’astronomie à très haute énergie (THE) a connu un bond lors des deux dernières décennies grâce à l’arrivée de la génération actuelle de télescopes tcherenkov à imagerie atmosphérique (IACTs). Le réseau de télescopes H.E.S.S. (High Energy Stereoscopic System), installé en Namibie, a grandement contribué à cet essor.
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Parmi les nombreux phénomènes... -
Julian Hamo (IJCLab)02/12/2025 11:10Astroparticle
Both the Rubin Observatory and the first telescopes of the CTAO will be collecting data by 2026, marking a new era in optical and gamma-ray astronomy. Compared to predecessors like the ZTF, H.E.S.S., MAGIC, and VERITAS, their enhanced sensitivity will extend extragalactic observations to a redshift of at least $\sim$2.5. This advancement offers fresh insights into non-thermal astrophysical...
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Janna Machts02/12/2025 11:35Astroparticle
The DarkSide20k experiment is a direct Dark Matter detector focused on the search for WIMP dark matter. Its main component is a dual-phase Argon Time Projection Chamber (TPC). Here, particles are detected from collisions with Argon atoms and the subsequent emission of scintillation light as well as ionisation electrons. Since the rate of signal events is expected to be much lower than...
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Anastasiia Mikhno02/12/2025 12:00Astroparticle
The Cherenkov Telescope Array Observatory (CTAO) is going to consist of more than 60 telescopes in the northern and southern hemispheres, being the largest and most sensitive instrument to gamma rays from 20 GeV to 300 TeV. The arrays will be made of four Large-Sized Telescopes (LSTs) in the Northern Hemisphere, up to 23 Medium-Sized Telescopes (MSTs) distributed over both array sites for its...
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Bernardo Cornejo (CEA - Irfu)02/12/2025 13:55Astroparticle
Multi-wavelength and multi-messenger astrophysics have experienced remarkable growth over the past decade, aiming to build a comprehensive picture of various cosmic phenomena. Transient sources, in particular, greatly benefit from the complementary information provided by multi-messenger observations, both enhancing follow-up of rapidly fading signals and allowing for a better physical...
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Gaspard Joubert02/12/2025 14:20Astroparticle
The first direct observation of gravitational waves (GW) in 2015 by the LIGO/Virgo/Kagra (LVK) collaboration opened a new era of astronomy. The GW group at IP2I in Lyon contributes to both the analysis of interferometers data and the characterization of the VIRGO detector. Most gravitational-wave online search pipelines rely on matched filtering (MF), a method which compares the data to a...
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Nathan Lebas02/12/2025 14:45Astroparticle
The Giant Radio Array for Neutrino Detection (GRAND) is a project aiming at the detection of ultra-high-energy (UHE) cosmic rays, gamma rays and neutrinos through the radio emission produced by extensive air showers in the atmosphere. It consists of a network of autonomous radio antennas deployed over large areas in radio-quiet, mountainous regions, using the surrounding topography as a target...
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Adrien Blanchet (CERN EP-NU)02/12/2025 15:10
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Jean-Baptiste Plançon (Laboratoire Leprince-Ringuet)02/12/2025 15:40Neutrino physics
T2K is a long-baseline experiment measuring neutrino and antineutrino oscillations by observing the disappearance of muon neutrinos, as well as the appearance of electron neutrinos. The ND280 near detector at J-PARC plays a crucial role to minimise the systematic uncertainties related to the neutrino flux and neutrino-nucleus interactions of the un-oscillated neutrino beam. The ND280 detector...
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Jérémy QUELIN LECHEVRANTON (IJCLab, DUNE)02/12/2025 16:35Neutrino physics
DUNE is a neutrino oscillation experiment expected to take its first data around 2030. A near and a far measurement of a accelerator-produced muon neutrino flux allows for a precise determination of the oscillation parameters, including a first measurement of $\delta_{\mathrm{CP}}$ (CP violation parameter). The far detector is a compound of tens of kilotons liquid argon time projection...
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Maël Martin (LAPP)02/12/2025 17:00Neutrino physics
The Deep Underground Neutrino Experiment (DUNE) is a next-generation long baseline neutrino experiment. By using Liquid Argon Time Projection Chamber (LArTPC) detectors to detect GeV-scale neutrinos produced by an accelerator, DUNE's main physics goals are to measure the CP-violating phase ($\delta_{\text{CP}}$), determine the neutrino mass ordering and resolve the $\theta_{23}$ octant....
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Benjamin Audurier (CEA)02/12/2025 17:25
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Félix TOUCHTE CODJO (PHE/JLab-EIC)02/12/2025 17:55Hadronic Physics
The ALERT experiment aims to advance our understanding of the nuclear structure in terms of quarks and gluons by precisely measuring the electroproduction of a real photon through the interaction with a nuclear target such as the Helium-4. This process referred as the Deeply Virtual Compton Scattering (DVCS) gives us access to the tomography of quarks inside the nucleus. The achievement of...
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CLEMENT LOTTEAU03/12/2025 09:00Hadronic Physics
My PhD thesis is the measurement of beauty production in
proton-proton and Pb-Pb collisions with the ALICE experiment at the CERN LHC and my talk will focus on a crucial part in the study of b-jet production: b-jet tagging.I will compare two methods for b-jet tagging: the Track Counting method which relies on impact parameter significance, and Boosted Decision Trees (a machine learning...
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Elouan Ferrand (DPhN/CEA Saclay)03/12/2025 09:25Hadronic Physics
Deeply Virtual Compton Scattering (DVCS) is a powerful tool to investigate the internal structure of hadrons in terms of Generalized Parton Distributions (GPDs). The Sullivan process, involving the exchange of a virtual pion from the proton’s meson cloud, offers a unique opportunity to access the three-dimensional structure of the pion at high energies. Since the pion plays a central role in...
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Paul Veen (Paris-Saclay/CEA)03/12/2025 09:50Hadronic Physics
The Quark–Gluon Plasma (QGP) is a deconfined state of matter consisting of quarks and gluons, theorized to have existed during the earliest moments after the Big Bang. Hadronisation refers to the process by which quarks combine to form composite particles known as hadrons. Studying how hadronisation occurs within the QGP provides valuable insights into how the first particles in our Universe...
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Lang XU03/12/2025 10:45Hadronic Physics
One of the most intriguing findings from high-energy collisions is strangeness enhancement, which has motivated numerous studies aimed at uncovering its origin. ALICE has previously measured the production rates of (multi-)strange particles in high-energy jets in pp and p–Pb collisions to probe the hadronization mechanism in small systems. In this talk, the average transverse-momentum fraction...
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Stanislas Lambert03/12/2025 11:10Hadronic Physics
The quark-gluon plasma (QGP) is a state of matter at high temperatures and/or high baryon density where quarks and gluons are asymptotically free and not confined in hadrons anymore. Experimentally, it can be produced
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during heavy ion collisions using large accelerator facilities such as the LHC. The ALICE experiment focuses on characterizing the QGP properties using
the aforementioned... -
Jonathan Kriewald (Jožef Stefan Institute)03/12/2025 11:35
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Thomas REGGIO (LPCA)03/12/2025 12:05Theory
The freeze-in mechanism is an alternative mechanism for dark matter production to standard thermal freeze-out. Freeze-in computations are typically performed assuming a very high initial ("reheating") temperature. However, this temperature is poorly constrained and can take relatively small values. I will discuss dark matter freeze-in in such a scenario and highlight how dark matter production...
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03/12/2025 14:00
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Emma Bruyere (IAP)04/12/2025 08:55Theory
The propagation of gravitational waves shares formal similarities with that of light. However, their typically much larger wavelengths render the geometric optics — or eikonal — approximation insufficient when considering propagation in curved spacetime. The purpose of this thesis is to establish a systematic framework that goes beyond this approximation, and to assess its implications for the...
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Adèle Poudou (LUPM)04/12/2025 09:20Cosmology
We update constraints on a simple model of self-interacting neutrinos involving a heavy scalar mediator with universal flavor coupling. According to past literature, such a model is allowed by Cosmic Microwave Background (CMB) data, with some CMB and large-scale structure data even favoring a strongly-interacting neutrino (SI$\nu$) scenario over $\Lambda$CDM. In this work, we re-evaluate the...
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Angela Burger (L2I Toulouse, CNRS/IN2P3, Université de Toulouse)04/12/2025 09:45
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Eva Mayer (Université Clermont Auvergne)04/12/2025 10:45Beyond Standard Model
The search for resonant mass bumps in invariant-mass distributions remains a cornerstone strategy for uncovering Beyond the Standard Model (BSM) physics at the Large Hadron Collider (LHC). Traditional methods often rely on predefined functional forms and exhaustive computational and human resources, limiting the scope of tested final states and selections.
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This poster presents BumpNet, a... -
Antoine VEZON (LPC CAEN)04/12/2025 11:10Beyond Standard Model
The Standard Model (SM) of particle physics successfully describes most observed phenomena, yet it fails to explain the matter-antimatter asymmetry in the Universe. This discrepancy suggests the existence of new sources of CP violation beyond those present in the SM. The neutron Electric Dipole Moment (nEDM) is a powerful observable for searching for new physics, as it is highly sensitive to...
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04/12/2025 11:35
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04/12/2025 13:30
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Christina AGAPOPOULOU (IJCLab)04/12/2025 15:10
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Abdelhamid Haddad (LPCA, Université Clermont-Auvergne, CNRS/IN2P3 (FR))04/12/2025 15:40Instrumentation
The upcoming High-Luminosity phase of the Large Hadron Collider (HL-LHC) will deliver unprecedented luminosities, posing significant challenges for particle reconstruction and pile-up mitigation. To preserve excellent tracking and vertexing performance under these conditions, the ATLAS experiment is developing the High Granularity Timing Detector (HGTD), a precision timing layer capable of...
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Evangelia Nikoloudaki (APC)04/12/2025 16:35Instrumentation
The X-ArT (Xenon-Argon Technology) collaboration has studied the scintillation mechanisms in pure and Xe-doped liquid argon (LAr) using silicon photomultipliers sensitive to different wavelength ranges. Thanks to our measurements we identified a long-lived (>10μs) component attributed to extreme ultraviolet (EUV) photons emitted by the metastable levels of atomic argon. Based on this...
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Morane Gautier04/12/2025 17:00Instrumentation
I am starting my second year thesis at Paris-Saclay university / CEA, within the ERC G-LEAD project, on the development of innovative electronics for a radiometer aimed at QCD axion dark matter searches.
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My thesis focuses on developing a radiometer covering a frequency band from 10 GHz to 40 GHz, corresponding to a axion mass range of $50\mu$eV to $150\mu$eV.
This detector is designed to... -
William VAGINAY (CNRS - IP2I)04/12/2025 17:25Instrumentation
Dans le cadre des projets de collisionneurs leptoniques futurs, un prototype de calorimètre hadronique ultra granulaire, le SDHCAL, a été réalisé à l’IP2I.
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Pour les projets de collisionneurs leptoniques circulaires comme le FCC et le CEPC, il est proposé d’adjoindre au SDHCAL une capacité de mesures précises du temps pour former un calorimètre ultra granulaire en temps et espace. Cette... -
Yohann RAMSI (subatech)04/12/2025 17:50Instrumentation
The new 3γ imaging technique, based on the use of the radionuclide 44Sc, enables the direct three-dimensional reconstruction of a radioactive source from the simultaneous detection of three gamma photons. This approach has the potential to reduce both acquisition time and injected activity compared to conventional nuclear imaging methods. To investigate this concept, a liquid xenon Compton...
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Mlle Rania Jbara (Nantes Université CNRS/IN2P3/IMT Atlantique, SUBATECH UMR 6457, F-44000 Nantes, France/GIP ARRONAX, 44817 Saint Herblain Cedex,France)05/12/2025 10:45Instrumentation
Abstract: The C70XP cyclotron at ARRONAX, located in Saint Herblain [1], is capable of delivering different types of particle beams: Protons and alpha particles up to 70 MeV & deuterons up to 35 MeV. At the cyclotron level, in standard mode, bunches of ions can be delivered with a duration of 3ns separated by 33ns each, and beam intensities ranging from very low (< 1 pA) to very high (up to...
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Chloé PENELAUD05/12/2025 11:10Instrumentation
The High-Luminosity upgrade of the Large Hadron Collider (HL-LHC) is scheduled to begin colliding protons in 2028. This increase of luminosity will induce a larger number of collisions per beam crossing (around 200). This phenomenon is called the pile-up (μ). A High Granularity Timing Detector (HGTD) has been proposed for the ATLAS experiment to address this new challenges. This new ATLAS...
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Mostafa Cherif05/12/2025 11:35Instrumentation
With the High Luminosity LHC (HL-LHC) upgrade scheduled for 2030, a major upgrade of the LHCb experiment is planned to adapt to the expected harsh environment. At the Upstream (UP) and MightyTracker (MT) tracking stations, Monolithic Active Pixel Sensors (MAPS) have been chosen for their high resistivity to radiation and their small pixel sizes. This high granularity and the higher pile-up at...
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Tatiana LE BELLEC (IP2I)05/12/2025 12:00Instrumentation
Coherent elastic neutrino nucleus scattering (CEvNS) was first measured experimentally by the COHERENT experiment in 2017 and is currently being studied by many experiments all around the world. In this context, the Ricochet international collaboration aims to detect the CEvNS process in order to search for new physics. The detectors used are germanium crystals operated at cryogenic...
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Ward AMAR05/12/2025 13:55Instrumentation
In this presentation, I present the optical design of the stable power and signal recycling cavities for the gravitational-wave detector Advanced Virgo+. First, I explain the importance of the stable cavities upgrade for improving the detector’s control and noise performances. The optical design of the cavities is developed to fit within the limited infrastructure available at the Virgo site....
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Salah El Dine HAMMOUD (CNRS - Universite Paris-Saclay - IJCLab/PHE/ATLAS)05/12/2025 14:20Instrumentation
Timing measurements are critical for the detectors at the future HL-LHC, to resolve reconstruction ambiguity when the number of simultaneous interactions reaches up to 200 per bunch crossing. The ATLAS collaboration therefore builds a new High-Granularity Timing detector for the forward region. A customized ASIC, called ALTIROC, has been developed, to read out fast signals from low-gain...
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Raphael BERTRAND (Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France)05/12/2025 14:45Instrumentation
The Large Hadron Collider (LHC) collides protons at nearly the speed of light, producing new particles observed by the ATLAS detector. In 2026, the LHC will undergo a major upgrade to the High-Luminosity LHC (HL-LHC), increasing luminosity by a factor of 5–7 and delivering up to 200 simultaneous collisions. To cope with the resulting data rates, ATLAS will replace the readout electronics of...
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Guillem Tocabens (IJCLab)05/12/2025 15:10
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Charles Soto05/12/2025 15:40Nuclear Physics
Nucleosynthesis is the branch of physics that studies the creation sites and mechanisms of the elements present in our universe. The synthesis of the proton-rich stable isotopes heavier than iron, known as the p-nuclei, remains one of the open questions in nuclear astrophysics. Their production in high-temperature stellar environments critically depends on reaction rates involving...
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Adrien Vieville (CNRS -LPSC)05/12/2025 16:35Nuclear Physics
Présentation de l'intérêt de rajouter une mesure de temps de vol suite a une mesure en spectrométrie pour l'étude de la fission. Présentation du fonctionnement d'une ligne de temps de vol, et de quelques résultats obtenus au laboratoire et à l’ILL.
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Baptiste METIVIER (IMT Atlantique)05/12/2025 17:00Nuclear Physics
La composante nucléaire de la transition énergétique en France soulève de nombreuses questions. La prolongation du parc nucléaire historique, la question de la construction de nouveaux réacteurs et la gestion avancée des combustibles usés sont autant de facteurs d’incertitudes, en particulier via leur impact économique sur le coût de la production électrique.
La recherche académique est...
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Shiyu Liu (IJCLab)05/12/2025 17:25Nuclear Physics
Thorium-based molten salt reactors have recently attracted increasing interest as one of the promising Generation-IV reactor concepts and as a potentially safer alternative to Uranium-fuelled systems. However, the fission properties of Thorium are still insufficiently understood, particularly due to the limited availability of experimental fission yield data. In this work, we analyze γ-ray...
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Andreas Goudelis (LPC - Clermont Ferrand), Dr Antonio Uras (IP2I Lyon), Louis D'Eramo (LPCA - Clermont), Rachel Delorme (LPSC, Grenoble), Thomas STREBLER (CPPM, Aix-Marseille Université, CNRS/IN2P3 (FR))05/12/2025 22:00
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Manuel Pronesti (CPPM, Aix-Marseille Université, CNRS/IN2P3)Astroparticle
The nature of dark matter, whose existence is firmly established by astrophysical and cosmological observations, remains one of the most compelling open questions in physics. Among the proposed candidates, Weakly Interacting Massive Particles (WIMPs) are one of the most promising models. They are theoretically motivated by the so-called “WIMP miracle”: a weakly interacting, stable particle...
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Stanislas Lambert
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Andrés Duque (Laboratoire de Physique de Clermont Auvergne)Standard Model
In high-energy collisions, jets, which are collimated sprays of particles, can originate from various fundamental particles, including W and Z bosons, top quarks, and the Higgs boson. Accurately identifying these jets is crucial for studying Standard Model processes and investigating new physics beyond its framework. This study, conducted within the ATLAS collaboration at the Large Hadron...
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