J. Holeczek
A5104593043- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Nuclear physics research studies
- Nuclear Physics and Applications
- Muon and positron interactions and applications
- Particle accelerators and beam dynamics
- Radiation Detection and Scintillator Technologies
- Quantum Chromodynamics and Particle Interactions
- Atomic and Subatomic Physics Research
- Nuclear reactor physics and engineering
- Particle Detector Development and Performance
- High-Energy Particle Collisions Research
- Atomic and Molecular Physics
- Catalytic Processes in Materials Science
- Astronomical Observations and Instrumentation
- Analytical Chemistry and Sensors
- Spectroscopy and Laser Applications
- Quantum, superfluid, helium dynamics
- Enzyme Structure and Function
- Astro and Planetary Science
- Magnetic confinement fusion research
- Particle Accelerators and Free-Electron Lasers
- Plasma Diagnostics and Applications
University of Silesia in Katowice
2015-2025
Institute of Physics
2014-2023
University of Bern
2023
Albert Einstein College of Medicine
2023
Eötvös Loránd University
2023
Boston University
2013-2023
Duke University
2023
Universidad Autónoma de Madrid
2023
University of California, Irvine
2013-2023
Colorado State University
2023
The T2K experiment measures muon neutrino disappearance and electron appearance in accelerator-produced antineutrino beams. With an exposure of 14.7(7.6)×1020 protons on target the (antineutrino) mode, 89 νe candidates seven anti-νe are observed, while 67.5 9.0 expected for δCP=0 normal mass ordering. obtained 2σ confidence interval CP-violating phase, δCP, does not include CP-conserving cases (δCP=0, π). best-fit values other parameters sin2θ23=0.526+0.032−0.036 Δm232=2.463+0.071−0.070×10−3...
New data from the T2K neutrino oscillation experiment produce most precise measurement of mixing parameter ${\ensuremath{\theta}}_{23}$. Using an off-axis beam with a peak energy 0.6 GeV and set corresponding to $6.57\ifmmode\times\else\texttimes\fi{}1{0}^{20}$ protons on target, has fit energy-dependent ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ probability determine parameters. The 68% confidence limit ${\mathrm{sin}}^{2}({\ensuremath{\theta}}_{23})$ is...
The T2K experiment reports updated measurements of neutrino and antineutrino oscillations using both appearance disappearance channels. This result comes from an exposure $14.9(16.4)\ifmmode\times\else\texttimes\fi{}1{0}^{20}$ protons on target in (antineutrino) mode. Significant improvements have been made to the interaction model far detector reconstruction. An extensive set simulated data studies also performed quantify effect uncertainties oscillation parameter sensitivity. performs...
The three-body breakup ${}^{6}{\stackrel{\ensuremath{\rightarrow}}{\mathrm{He}}}^{4}\mathrm{He}+n+n$ is studied experimentally, using a secondary ${}^{6}\mathrm{He}$ ion beam of 240 MeV/nucleon incident on carbon and lead targets. Integrated cross sections for one- two-neutron knockout differential $d\ensuremath{\sigma}{/dE}^{*}$ $d\ensuremath{\sigma}/d\ensuremath{\vartheta}$ inelastic nuclear or electromagnetic excitations into the continuum are presented. $E$1-strength distribution deduced...
T2K reports its first results in the search for CP violation neutrino oscillations using appearance and disappearance channels neutrino- antineutrino-mode beams. The data include all runs from January 2010 to May 2016 comprise 7.482×10^{20} protons on target mode, which yielded far detector 32 e-like 135 μ-like events, 7.471×10^{20} antineutrino 4 66 events. Reactor measurements of sin^{2}2θ_{13} have been used as an additional constraint. one-dimensional confidence interval at 90% phase...
This paper reports on the search for heavy neutrinos with masses in range $140 < M_N 493$ MeV/c$^2$ using off-axis near detector ND280 of T2K experiment. These particles can be produced from kaon decays standard neutrino beam and then subsequently decay ND280. The modes under consideration are $N \to \ell^{\pm}_{\alpha} \pi^{\mp}$ \ell^+_{\alpha} \ell^-_{\beta} \nu (\bar\nu)$ ($\alpha,\beta=e,\mu$). A such events has been made Time Projection Chambers ND280, where background reduced to less...
We report the measurement of muon neutrino charged-current interactions on carbon without pions in final state at T2K beam energy using $5.734\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons target. For first time is reported as a flux-integrated, double-differential cross section kinematic variables ($\mathrm{cos}{\ensuremath{\theta}}_{\ensuremath{\mu}}$, ${p}_{\ensuremath{\mu}}$), correcting for events where pion produced and then absorbed by interactions. Two analyses are performed...
Peripheral fragmentation of a 287 MeV/nucleon beam the halo nucleus ${}^{11}\mathrm{Li}$ incident on carbon target has been studied in fragment-neutron coincidence experiment. The momentum distribution ${}^{10}\mathrm{Li}$ fragments gives access to removed neutron ${}^{11}\mathrm{Li}$. From shape distribution, $({1s}_{1/2}{)}^{2}$ contribution mixture and $({0p}_{1/2}{)}^{2}$ components ground-state wave function was determined be $(45\ifmmode\pm\else\textpm\fi{}10)%$. angular correlation...
The T2K off-axis near detector, ND280, is used to make the first differential cross-section measurements of electron neutrino charged current interactions at energies ~1 GeV as a function momentum, scattering angle and four-momentum transfer interaction. total flux-averaged $\nu_e$ on carbon measured be $1.11\pm0.09~(stat)\pm0.18~(syst)\times10^{-38} cm^2/nucleon$. agree with predictions two leading interaction generators, NEUT GENIE. prediction $1.23\times10^{-38} cm^2/nucleon$ GENIE...
Liquid Argon Time Projection Chamber (LAr TPC) detectors offer charged particle imaging capability with remarkable spatial resolution. Precise event reconstruction procedures are critical in order to fully exploit the potential of this technology. In paper we present a new, general approach 3D for LAr TPC practical application track reconstruction. The efficiency method is evaluated on sample simulated tracks. We also analysis stopping tracks collected during ICARUS T600 detector operation...
We report an updated result from the ICARUS experiment on search for {\nu}{\mu} ->{\nu}e anomalies with CNGS beam, produced at CERN average energy of 20 GeV and travelling 730 km to Gran Sasso Laboratory. The present analysis is based a total sample 1995 events neutrino interactions, which corresponds almost doubled respect previously published result. Four clear {\nu}e have been visually identified over full sample, compared expectation 6.4 +- 0.9 conventional sources. compatible absence...
The ICARUS T600 detector, the largest liquid Argon Time Projection Chamber (LAr-TPC) realized after many years of R&D activities, was installed and successfully operated for 3 at INFN Gran Sasso underground Laboratory. One most important issues need an extremely low residual electronegative impurity content in Argon, order to transport free electrons created by ionizing particles with very small attenuation along drift path. solutions adopted recirculation purification systems have permitted...
Sterile neutrinos - that do not directly participate in weak interactions remain a vibrant possibility could resolve number of anomalies observed neutrino experiments. The T2K Collaboration's latest analysis tests the hypothesis single light sterile neutrino. negative results their search set strongest limits to date on mass splitting and mixing angle probed by long baseline experiment.
Peripheral fragmentation of a 240 MeV͞nucleon beam the halo nucleus 6 He incident on carbon target has been studied in kinematically complete experiment.It is found that one-neutron stripping to unbound 5 dominant mechanism and it leads spin alignment plane perpendicular momentum vector.This expected be common feature for all neutron nuclei.
We report a measurement of the flux-integrated cross section for inclusive muon neutrino charged-current interactions on carbon. The double-differential measurements are given as function momentum and angle. Relative to our previous publication this topic, these results have an increased angular acceptance higher statistics. data sample presented here corresponds $5.7\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons target. total is measured be...
We report the first measurement of flux-averaged cross section for charged current coherent π^{+} production on carbon neutrino energies less than 1.5 GeV, and with a restriction final state phase space volume in T2K near detector, ND280. Comparisons are made predictions from Rein-Sehgal model by Alvarez-Ruso et al., latter representing implementation an instance new class microscopic models interaction Monte Carlo event generator. observe clear excess above background, disagreeing null...
The measurement of muon momentum by Multiple Coulomb Scattering is a crucial ingredient to the reconstruction νμ CC events in ICARUS-T600 liquid argon TPC absence magnetic field, as search for sterile neutrinos at Fermilab where ICARUS will be exposed ∼ 1 GeV Booster neutrino beam. A sample 1000 stopping muons produced charged current interactions CNGS surrounding rock INFN Gran Sasso underground Laboratory provides an ideal benchmark few-GeV range since their can directly and independently...