L. Gatignon

ORCID: 0000-0001-6439-2945
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About
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Research Areas
  • Particle physics theoretical and experimental studies
  • Quantum Chromodynamics and Particle Interactions
  • High-Energy Particle Collisions Research
  • Dark Matter and Cosmic Phenomena
  • Particle Accelerators and Free-Electron Lasers
  • Particle Detector Development and Performance
  • Neutrino Physics Research
  • Crystallography and Radiation Phenomena
  • Computational Physics and Python Applications
  • Particle accelerators and beam dynamics
  • Superconducting Materials and Applications
  • Radiation Detection and Scintillator Technologies
  • Advanced Electron Microscopy Techniques and Applications
  • Muon and positron interactions and applications
  • Black Holes and Theoretical Physics
  • Nuclear materials and radiation effects
  • Medical Imaging Techniques and Applications
  • Radiation Therapy and Dosimetry
  • Microstructure and mechanical properties
  • Atomic and Subatomic Physics Research
  • Ion-surface interactions and analysis
  • Advanced X-ray Imaging Techniques
  • Astrophysics and Cosmic Phenomena
  • X-ray Spectroscopy and Fluorescence Analysis
  • Radiation Effects in Electronics

European Organization for Nuclear Research
2014-2024

Lancaster University
2022-2024

TRIUMF
2023-2024

Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
2022-2024

Scuola Superiore Meridionale
2024

UCLouvain
2022-2023

Royal Holloway University of London
2020

University of Illinois Urbana-Champaign
2020

Johannes Gutenberg University Mainz
2016-2020

Joint Institute for Nuclear Research
2004-2020

A sample of 1.69×107 fully reconstructed π0→γe+e− decay candidates collected by the NA48/2 experiment at CERN in 2003–2004 is analyzed to search for dark photon (A′) production π0→γA′ followed prompt A′→e+e− decay. No signal observed, and an exclusion region plane mass mA′ mixing parameter ε2 established. The obtained upper limits on are more stringent than previous range 9MeV/c2<mA′<70MeV/c2. sensitivity K±→π±A′ also evaluated.

10.1016/j.physletb.2015.04.068 article EN cc-by Physics Letters B 2015-05-05

The direct CP violation parameter Re(epsilon'/epsilon) has been measured from the decay rates of neutral kaons into two pions using NA48 detector at CERN SPS. 2001 running period was devoted to collecting additional data under varied conditions compared earlier years (1997-99). new yield result: = (13.7 +/- 3.1) times 10^{-4}. Combining this result with that published 1997, 98 and 99 data, an overall value (14.7 2.2) 10^{-4} is obtained experiment.

10.1016/s0370-2693(02)02476-0 article EN cc-by Physics Letters B 2002-09-01

We report the results from a study of ~23 Million K+- ==&gt; pi+- pizero decays recorded by NA48/2 experiment at CERN SPS, showing an anomaly in invariant mass distribution region around 2m+, where m+ is charged pion mass. This anomaly, never observed previous experiments, can be interpreted as effect due mainly to final state charge exchange scattering process pi+ pi- decay. It provides precise determination a0 - a2, difference between pi-pi lengths isospin I=0 and I=2 states.

10.1016/j.physletb.2005.11.087 article EN cc-by Physics Letters B 2005-12-15

We report results from the analysis of $\mbox {$\mathrm {K}^{\pm}$}\rightarrow \pi^{+} \pi^{-} \mathrm{e}^{\pm} \nu$ ( {K}_{\mathrm {e}4}$}$ ) decay by NA48/2 collaboration at CERN SPS, based on total statistics 1.13 million decays collected in 2003–2004. The hadronic form factors S- and P-wave their variation with energy are obtained. phase difference between states ππ system is accurately measured allows a precise determination {$a_{0}^{0}$}$ {$a_{0}^{2}$}$ , I = 0 2 S-wave scattering...

10.1140/epjc/s10052-010-1480-6 article EN cc-by-nc The European Physical Journal C 2010-11-05

We report results from a new measurement of the Ke4 decay K±→π+π-e±ν by NA48/2 collaboration at CERN SPS, based on partial sample more than 670 000 decays in both charged modes collected 2003. The form factors hadronic current (F,G,H) and ππ phase difference (δ=δs-δp) have been measured ten independent bins mass spectrum to investigate their variation. A sizeable acceptance large mass, low background very good resolution contribute an improved experimental accuracy, factor two better...

10.1140/epjc/s10052-008-0547-0 article EN cc-by-nc The European Physical Journal C 2008-02-18

The main characteristics of the COMPASS experimental setup for physics with hadron beams are described. This was designed to perform exclusive measurements processes several charged and/or neutral particles in final state. Making use a large part apparatus that previously built spin structure studies muon beam, it also features new target system as well or upgraded detectors. is able operate at high incident flux available CERN. It characterised by angular and momentum coverages, nearly flat...

10.1016/j.nima.2015.01.035 article EN cc-by Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 2015-01-19

The NA62 experiment at CERN SPS is designed to study the $K^+\to\pi^+\nu\bar\nu$ decay. After collecting data in 2016, 2017, and 2018, has resumed taking 2021 received approval for operations until onset of LS3. first search lepton number violating decay $K^+\to\pi^0\pi^-\mu^+ e^+$ flavour decays $K^+\to\pi^0\pi^+\mu^+ e^-$ , $K^+\to\pi^0\pi^+\mu^- reported. More recent results from analyses $K^+\to\pi^+\gamma\gamma$ $\pi^0\to e^+e^-$ are also Additionally, New Physics collected during...

10.22323/1.465.0222 article EN cc-by-nc-nd 2025-02-07

A study of the dynamics rare decay K±→π±γγ has been performed on a sample 232 candidates, with an estimated background 17.4±1.1 events, collected by NA62 experiment at CERN in 2007. The results are combined those from measurement conducted NA48/2 Collaboration CERN. model-independent branching ratio kinematic range z=(mγγ/mK)2>0.2 is BMI(z>0.2)=(0.965±0.063)×10−6, and full assuming Chiral Perturbation Theory description B(Kπγγ)=(1.003±0.056)×10−6. detailed comparison previous measurements performed.

10.1016/j.physletb.2014.03.016 article EN cc-by Physics Letters B 2014-03-20

We report the results from a study of full sample ∼6.031×107 K ±→π ± π 0 decays recorded by NA48/2 experiment at CERN SPS. As first observed in this experiment, invariant mass (M 00) distribution shows cusp-like anomaly region around M 00=2m +, where m + is charged pion mass. This has been interpreted as an effect due mainly to final state charge exchange scattering process −→π − decay. Fits 00 using two different theoretical formulations provide presently most precise determination 0−a 2,...

10.1140/epjc/s10052-009-1171-3 article EN cc-by-nc The European Physical Journal C 2009-10-19

10.1016/s0168-9002(00)00414-9 article EN Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 2000-09-01

The NA48/2 experiment at CERN collected a large sample of charged kaon decays to final states with multiple particles in 2003–2004. A new upper limit on the rate lepton number violating decay K±→π∓μ±μ± is reported: B(K±→π∓μ±μ±)<8.6×10−11 90% CL. Searches for two-body resonances X K±→πμμ (such as heavy neutral leptons N4 and inflatons χ) are also presented. In absence signals, limits set products branching fractions B(K±→μ±N4)B(N4→πμ) B(K±→π±X)B(X→μ+μ−) ranges assumed resonance masses...

10.1016/j.physletb.2017.03.029 article EN cc-by Physics Letters B 2017-03-18
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