M. Szleper
A5100770083- 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
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Distributed and Parallel Computing Systems
- Particle accelerators and beam dynamics
- Atomic and Subatomic Physics Research
- Muon and positron interactions and applications
- Superconducting Materials and Applications
- Gamma-ray bursts and supernovae
- Nuclear reactor physics and engineering
- Radiation Therapy and Dosimetry
- Nuclear physics research studies
- Radiation Detection and Scintillator Technologies
- Optical properties and cooling technologies in crystalline materials
- Inorganic Fluorides and Related Compounds
- International Science and Diplomacy
National Centre for Nuclear Research
2016-2025
Institute of High Energy Physics
2015-2024
Northwestern University
2007-2024
A. Alikhanyan National Laboratory
2022-2024
University of Antwerp
2024
Jagiellonian University
2024
Institute of Nuclear Physics, Polish Academy of Sciences
2024
University of Warsaw
1998-2023
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
2014-2021
European Organization for Nuclear Research
2004-2017
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.
The discovery of the Higgs boson in 2012, by ATLAS and CMS experiments, was a success achieved with only percent entire dataset foreseen for LHC. It opened landscape possibilities study properties, Electroweak Symmetry breaking Standard Model general, as well new avenues probing physics beyond Model. Six years after discovery, conspicuously larger collected during LHC Run 2 at 13 TeV centre-of-mass energy, theory experimental particle communities have started meticulous exploration potential...
The muon-proton and muon-deuteron inclusive deep inelastic scattering cross sections were measured in the kinematic range 0.002 < × 0.60 0.5 Q2 75 GeV2 at incident muon energies of 90, 120, 200 280 GeV. These results are based on full data set collected by New Muon Collaboration, including taken with a small angle trigger. extracted values structure functions F2p F2d good agreement those from other experiments. cover sufficient y to allow determination ratio longitudinally transversely...
We present a new determination of the nonsinglet structure function Fp2 - Fn2 at Q2=4 GeV2 using recently measured values Fd2 and Fn2/Fp2. A evaluation Gottfried sum is given, which remains below simple quark-parton model value 1/3.Received 1 March 1994DOI:https://doi.org/10.1103/PhysRevD.50.R1©1994 American Physical Society
Results are presented for F2d/F2p and Rd − Rp from simultaneous measurements of deep inelastic muon scattering on hydrogen deuterium targets, at 90, 120, 200 280 GeV. The difference Rp, determined in the range 0.002 < x 0.4 an average Q2 5 GeV2, is compatible with zero. dependence was measured kinematic 0.001 0.8 0.1 145 GeV2 small statistical systematic errors. For > ratio decreases Q2.
We report the results from a study of ~23 Million K+- ==> 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.
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...
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...
Insight into the electroweak (EW) and Higgs sectors can be achieved through measurements of vector boson scattering (VBS) processes. The EW bosons are rare processes that precisely predicted in Standard Model (SM) closely related to mechanism. Modifications VBS also models physics beyond SM (BSM), for example changes couplings gauge resonant production new particles. In this review, experimental results theoretical developments at Large Hadron Collider, its high luminosity upgrade, future...
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,...
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...
It is possible that measurements of vector boson scattering (VBS) processes at the LHC will reveal disagreement with Standard Model predictions, but no new particles be observed directly. The task then to learn as much about physics from a VBS analysis carried within framework Effective Field Theory (EFT). In this paper we discuss issues related correct usage EFT when WW invariant mass not directly accessible experimentally, in purely leptonic W decay channels. Strategies for future data...
The final phase of the ICARUS physics program requires a sensitive mass liquid Argon 5000 tons or more. T600 detector stands today as first living proof that such large can be built and imaging technology implemented on scales. After successful completion series technical tests to performed at assembly hall in Pavia, will ready transported into LNGS tunnel. operation allow us (1) develop local infrastructure needed operate our (2) start handling underground argon (3) study background (4)...
A search for the decay KS→π0μ+μ− has been made by NA48/1 Collaboration at CERN SPS accelerator. The data were collected during 2002 with a high-intensity KS beam. Six events found background expectation of 0.22−0.11+0.18 events. Using vector matrix element and unit form factor, measured branching ratio is B(KS→π0μ+μ−)=[2.9−1.2+1.5(stat)±0.2(syst)]×10−9.