The Fair Universe project organised the HiggsML Uncertainty Challenge, which took place from September to October 2024. This groundbreaking competition in high-energy physics (HEP) and machine learning was the first to place a strong emphasis on uncertainties, focusing on mastering both the uncertainties in the input training data and providing credible confidence intervals in the...
The Standard Model (SM) is currently the most predictive framework for describing interactions among the fundamental constituents of matter. It includes 19 free parameters, which are measured experimentally, notably with the ATLAS detector at the Large Hadron Collider (LHC) at CERN. These parameters encompass particle masses, phases, and coupling values. One of these couplings, the Higgs boson...
The high-luminosity era of the LHC will pose unprecedented challenges to the detectors. To meet these challenges, the CMS detector will undergo several upgrades, including the replacement the current endcap calorimeters with a novel High-Granularity Calorimeter (HGCAL). To make optimal use of this innovative detector, new and original algorithms are being devised. A machine-learning based...
The duration of the neutrino burst from the supernova event SN 1987A is known to be sensitive to exotic sources of cooling, such as axions radiated from the dense and hot hadronic matter thought to constitute the inner core of the supernova. We perform the first quantitative study of the role of hadronic matter beyond the first generation -- in particular strange matter. We do so by...
Photo-nuclear reaction rates provide key inputs to various applications of nuclear physics and consist fundamental probes of nuclear structure, from single particle to collective excitations, revealing nature of complicated nucleonic correlations. Among the excitations of nuclei due to the external field, the E1 dipole response is of particular interest. In this talk, I will discuss recent...
The Standard Model (SM) of particle physics describes the fundamental particles and the interactions governing the universe. While it has been remarkably successful in providing experimental predictions, several phenomena remain unexplained, such as the matter/antimatter asymmetry, the nature of dark matter, and even the oscillation of neutrinos. In particular, neutrino oscillation experiments...
Pour le retraitement du cycle du combustible nucléaire à l'usine Orano de La Hague, la détermination précise de la composition isotopique des matières nucléaires est cruciale pour optimiser leur utilisation et assurer leur gestion. Les méthodes actuelles, comme l'analyse physico-chimique, présentent des limites et sont longues et complexes à mettre en œuvre. L'analyse par transmission de...
Precision measurements in beta decay play an essential role in the search for new physics beyond the standard model (SM), by probing “exotic” phenomena such as scalar and tensor interactions. The existence of such interactions induces deviations on specific observables, away from their SM predictions. The study of the full beta energy spectrum offers a sensitive mean to probe these...
The ATLAS detector is one of the four main experiments near the Large Hadron Collider (LHC) at CERN. The Liquid Argon Calorimeter (LAr) is an essential part of ATLAS, its primary purpose being the measurement of electrons and photons, but also providing important input for the measurement of jets and transverse impulses. Since LHC Run 1, the LAr is affected by a coherent noise phenomenon...
The generalized parton distributions (GPDs) embody multiple information about the inner structure of nucleons thus an important topic to investigate. Experimentally, physicists access GPDs through the Compton Form Factor (CFF), and the Deeply Virtual Compton Scattering (DVCS) is the simplest process to look into.
In Hall C at the Jefferson Lab (JLab), we collected DVCS data from the fall of...
Abstract : The High Energy Stereoscopic System (H.E.S.S.) is a gamma-ray observatory located in the highlands of Namibia, operational since 2002. It has undergone several upgrades to maintain scientific relevance and withstand the desert environment. H.E.S.S. houses CT5, the largest gamma-ray telescope, which has been equipped since 2019 with FlashCAM, a new prototype camera designed to...
Pulsars are rapidly rotating neutron stars for which we detect pulsed emission. Pulsars have been detected from radio (more than 3000 sources detected) to gamma-rays (300 sources detected in 3PC).
In the last 2 decades, Imaging Atmospheric Cherenkov Telescopes (IACTs), such as H.E.S.S., MAGIC or VERITAS, have drastically enhanced the very high energy (VHE) astronomy, with several hundreds of...
The project that I will describe concerns the study of the gamma-ray source VER J0521+211, an active galactic nucleus of the blazar subclass, using gamma-ray data from the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope and the Very Energetic Radiation Imaging Telescope Array System (VERITAS). I will first give an overview of the properties of this object and then I...
Physics at the Large Hadron Collider (LHC) at CERN (European Organization for Nuclear Research) is the high priority research field of the Particle Physics community worldwide. ATLAS is one of the two general purpose experiments installed at the LHC that discovered a Higgs boson in July 2012, key piece for the understanding of the fundamental interactions and the origin of elementary particle...
En 2012, le modèle standard a été complété après la découverte au LHC, par les expériences ATLAS et CMS, d’un boson scalaire pouvant correspondre au boson de Higgs tel que prédit par le mécanisme BEHHGK. Cependant, des modèles d’extensions du modèle standard comme le 2HDM ou la supersymétrie prédisent des bosons de Higgs additionnels pouvant posséder des masses bien différentes de celui...
The neutron electric dipole moment (nEDM) is the coupling of the neutron spin to an external electric field. A non-zero electric dipole moment would violate time reversal symmetry, source of charge-parity violation.
The n2EDM experiment aims to lower the nEDM upper limit by one order of magnitude, increasing the sensitivity to beyond standard model physics and to processes leading to baryon...
Being less well-known particles, neutrinos are one of the best starting points for new physics searches in particle physics. In this scope, the hypothesis of the existence of non-weakly interacting "sterile" neutrinos is a promising route to explore to go beyond the Standard Model.
The most direct way to explore this hypothesis is to study the oscillation patterns of active neutrinos, as...
The Deep Underground Neutrino Experiment (DUNE) is a next-generation neutrino oscillation experiment that will examine neutrino interactions to ultimately address some of the most fundamental questions in particle physics. To study neutrinos is very difficult and a more sophisticated reconstruction approach must be developed to fully exploit the high-resolution detection technology used by the...
The Deep Underground Neutrino Experiment (DUNE) is a next generation long baseline neutrino experiments. It is a Liquid Argon Time Projection Chamber (LArTPC) detector. While its main physics goals (measuring the $\delta_{\text{CP}}$ phase, resolving $\theta_{23}$ octant and the mass hierarchy) are focused on a GeV-scale physics DUNE has also a low energy (MeV-scale) program. This includes...
The Deep Underground Neutrino Experiment (DUNE) is a long baseline experiment that wants to answer questions like: the preponderance of matter over antimatter, the dynamics of the supernova neutrino bursts and whether protons decay, using a neutrino beam.
The experiment exploits Liquind ArgonTime Projection Chamber (LArTPC) technology.
DUNE consists of 4 modules of 17 kton located 1300 km...
