P. Chatagnon
A5029117868- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Nuclear physics research studies
- Astrophysics and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Medicine and Dermatology Studies History
- Metabolism and Genetic Disorders
- Syphilis Diagnosis and Treatment
- Diet, Metabolism, and Disease
- Radiation Detection and Scintillator Technologies
- Distributed and Parallel Computing Systems
- Electroconvulsive Therapy Studies
- Psychosomatic Disorders and Their Treatments
- Pulsars and Gravitational Waves Research
- Attention Deficit Hyperactivity Disorder
- Mitochondrial Function and Pathology
- Black Holes and Theoretical Physics
- Birth, Development, and Health
Thomas Jefferson National Accelerator Facility
2023-2025
Istituto Nazionale di Fisica Nucleare, Sezione di Genova
2021-2025
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
2020-2025
Institut de Recherche sur les Lois Fondamentales de l'Univers
2025
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2025
CEA Paris-Saclay
2025
A. Alikhanyan National Laboratory
2024
Institute of High Energy Physics
2023-2024
Université Paris-Saclay
2019-2024
Genoa (Brazil)
2023-2024
This document presents the initial scientific case for upgrading Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab (JLab) to 22 GeV. It is result of a community effort, incorporating insights from series workshops conducted between March 2022 and April 2023. With track record over 25 years in delivering world's most intense precise multi-GeV electron beams, CEBAF's potential higher energy upgrade unique opportunity an innovative nuclear physics program, which seamlessly...
Strange matter is believed to exist in the cores of neutron stars based on simple kinematics. If this true, then hyperon-nucleon interactions will play a significant part star equation state (EOS). Yet, compared other elastic scattering processes, there very little data $\Lambda$-$N$ scattering. This experiment utilized CLAS detector study $\Lambda p \rightarrow \Lambda p$ cross section incident $\Lambda$ momentum range 0.9-2.0 GeV/c. first reaction several decades. The new sections have...
Background: Energetic quarks in nuclear DIS propagate through the medium. Processes that are believed to occur inside nuclei include quark energy loss medium-stimulated gluon bremsstrahlung and intra-nuclear interactions of forming hadrons. More data required gain a more complete understanding these effects. Purpose: To test theoretical models parton transport hadron formation, we compared their predictions for kinematic dependence pion production nuclei. Methods: We have measured...
A multidimensional extraction of the structure function ratio σLT′/σ0 from hard exclusive e→p→e′nπ+ reaction above resonance region has been performed. The study was done based on beam-spin asymmetry measurements using a 10.6 GeV incident electron beam liquid-hydrogen target and CLAS12 spectrometer at Jefferson Lab. focus very forward regime (t/Q2 ≪ 1) with wide kinematic range xB in valence (0.17 < 0.55), virtualities Q2 ranging 1.5 GeV2 up to 6 GeV2. results their comparison theoretical...
We report the first measurements of deep inelastic scattering spin-dependent azimuthal asymmetries in back-to-back dihadron electroproduction process. In this reaction, two hadrons are produced opposite hemispheres along z axis virtual photon-target nucleon center-of-mass frame, with hadron current-fragmentation region and second target-fragmentation region. The data were taken longitudinally polarized electron beams 10.2 10.6 GeV incident on an unpolarized liquid-hydrogen target using...
The Electron-Ion Collider (EIC), a state-of-the-art facility for studying the strong force, is expected to begin commissioning its first experiments in 2028. This an opportune time artificial intelligence (AI) be included from start at this and all phases that lead up experiments. second annual workshop organized by AI4EIC working group, which recently took place, centered on exploring current prospective application areas of AI EIC. not only beneficial EIC, but also provides valuable...
We describe offline event reconstruction for the CEBAF Large Acceptance Spectrometer at 12 GeV (CLAS12), including an overview of framework and software tools, a description algorithms developed individual detector subsystems, overall approach charged neutral particle identification. also present scheme data processing code management procedures.
The polarized cross-section ratio σ_{LT^{'}}/σ_{0} from hard exclusive π^{-}Δ^{++} electroproduction off an unpolarized hydrogen target has been extracted based on beam-spin asymmetry measurements using a 10.2 GeV/10.6 GeV incident electron beam and the CLAS12 spectrometer at Jefferson Lab. study, which provides first observation of this channel in deep-inelastic regime, focuses very forward-pion kinematics valence photon virtualities ranging 1.5 GeV^{2} up to 7 GeV^{2}. reaction novel...
Measurements of the polarization observables <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:mi mathvariant="normal">Σ</a:mi><a:mo>,</a:mo><a:mi mathvariant="bold">P</a:mi><a:mo>,</a:mo><a:mi mathvariant="bold">T</a:mi><a:mo>,</a:mo><a:msub><a:mi mathvariant="bold">O</a:mi><a:mi mathvariant="bold">x</a:mi></a:msub><a:mo>,</a:mo><a:msub><a:mi mathvariant="bold">z</a:mi></a:msub></a:mrow></a:math> for reaction <i:math...
The spin structure functions of the proton and deuteron were measured during EG4 experiment at Jefferson Lab in 2006. Data collected for longitudinally polarized electron scattering off ${\mathrm{NH}}_{3}$ ${\mathrm{ND}}_{3}$ targets, ${Q}^{2}$ values as small 0.012 0.02 ${\mathrm{GeV}}^{2}$, respectively, using CEBAF Large Acceptance Spectrometer. This is archival paper that summarizes previously reported results ${g}_{1}$, ${A}_{1}{F}_{1}$, their moments...
Photoproduction of charged pions pairs off protons is studied within the invariant masses final state hadrons from 1.6 to 2.4 GeV at Thomas Jefferson National Accelerator Facility with CLAS detector. The total and differential cross sections spin-density matrix elements are presented for isobars $p{\ensuremath{\rho}}^{0}(770), \mathrm{\ensuremath{\Delta}}{(1232)}^{++}{\ensuremath{\pi}}^{\ensuremath{-}}$, $\mathrm{\ensuremath{\Delta}}{(1232)}^{0}{\ensuremath{\pi}}^{+}$. data included in...
We report the first experimental measurements of nine 1-fold differential cross sections for $\gamma p \to \pi^+\pi^-p$ reaction, obtained with CLAS detector at Jefferson Laboratory. The cover invariant mass range final state hadrons from 1.6~GeV~$<W<$~2.0~GeV. For time photocouplings all prominent nucleon resonances in this have been extracted exclusive channel. Photoproduction two charged pions is particular importance evaluation $\Delta(1620)1/2^-$, $\Delta(1700)3/2^-$, $N(1720)3/2^+$,...
In the past two decades, deeply virtual Compton scattering of electrons has been successfully used to advance our knowledge partonic structure free proton and investigate correlations between transverse position longitudinal momentum quarks inside nucleon. Meanwhile, bound nucleons in nuclei studied inclusive deep-inelastic lepton experiments off nuclear targets, showing a significant difference distribution nucleon, known as EMC effect. this Letter, we report first beam spin asymmetry (BSA)...
The observation of beam spin asymmetries in two-pion production semi-inclusive deep inelastic scattering off an unpolarized proton target is reported. data presented here were taken the fall 2018 with CLAS12 spectrometer using a 10.6 GeV longitudinally spin-polarized electron delivered by CEBAF at JLab. measured provide first opportunity to extract parton distribution function $e(x)$, which provides information about interaction between gluons and quarks, collinear framework that offers...
The new experimental measurements of beam spin asymmetry were performed for the deeply virtual exclusive π0 production in a wide kinematic region with photon virtualities Q2 up to 6.6 GeV2 and Bjorken scaling variable xB valence regime. data collected by CEBAF Large Acceptance Spectrometer (CLAS12) at Jefferson Lab longitudinally polarized 10.6 GeV electrons scattered on an unpolarized liquid-hydrogen target. Sizable values indicate substantial contribution from transverse amplitudes...
This paper presents, for the first time, measurements of neutron transparency ratios nuclei relative to C measured using (e,e'n) reaction, spanning momenta 1.4 2.4 GeV/c. The were extracted in two kinematical regions, corresponding knockout mean-field nucleons and breakup Short-Range Correlated nucleon pairs. are consistent with each other regions agree proton transparencies from new previous (e,e'p) measurements, including those neutron-rich such as lead. data also confirm Glauber...