D. Pszczel
A5028737001- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Nuclear physics research studies
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Quantum, superfluid, helium dynamics
- Particle Detector Development and Performance
- Particle accelerators and beam dynamics
- Atomic and Molecular Physics
- Statistical Mechanics and Entropy
- Nuclear reactor physics and engineering
- Stochastic processes and statistical mechanics
- Scientific Research and Discoveries
- Astronomical and nuclear sciences
- Scientific Computing and Data Management
- Computational Physics and Python Applications
- Gamma-ray bursts and supernovae
- Distributed and Parallel Computing Systems
National Centre for Nuclear Research
2016-2025
Uppsala University
2013-2020
Forschungszentrum Jülich
2015-2020
Institute for Theoretical and Experimental Physics
2016-2017
University of Tübingen
2014
Exclusive and kinematically complete high-statistics measurements of quasifree polarized $\stackrel{\ensuremath{\rightarrow}}{n}p$ scattering have been performed in the energy region narrow resonancelike structure ${d}^{*}$ with $I({J}^{P})=0({3}^{+})$, $M\ensuremath{\approx}2380\text{ }\text{ }\mathrm{MeV}$, $\mathrm{\ensuremath{\Gamma}}\ensuremath{\approx}70\text{ }\mathrm{MeV}$ observed recently double-pionic fusion channels...
Exclusive measurements of the quasifree $pn\ensuremath{\rightarrow}pp{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{\ensuremath{-}}$ reaction have been performed by means $pd$ collisions at ${T}_{p}$ $=$ 1.2 GeV using wide angle shower apparatus (WASA) detector setup cooler synchrotron COSY (Institut f\"ur Kernphysik, J\"ulich). Total and differential cross sections obtained covering energy region $\sqrt{s}$ (2.35--2.46) GeV, which includes ABC effect its associated resonance structure. No...
New data on quasifree polarized neutron-proton scattering in the region of recently observed ${d}^{*}$ resonance structure are obtained by exclusive and kinematically complete high-statistics measurements with WASA at COSY. This paper details determination beam polarization, checks character process, all ${A}_{y}$ angular distributions new partial-wave analysis, which includes producing a pole ${}^{3}{D}_{3}\ensuremath{-}{}^{3}{G}_{3}$ coupled partial waves...
Exclusive measurements of the quasi-free $np \to np\pi^0\pi^0$ reaction have been performed by means $dp$ collisions at $T_d$ = 2.27 GeV using WASA detector setup COSY. Total and differential cross sections obtained covering energy region $\sqrt s$ (2.35 - 2.46) GeV, which includes ABC effect its associated $d^*(2380)$ resonance. Adding $d^*$ resonance amplitude to that for conventional processes leads a reasonable description data. The observed in total section is agreement with predictions...
An exclusive measurement of the excitation function for dd->3Heppi- reaction was performed at Cooler Synchrotron COSY-Juelich with WASA-at-COSY detection system. The data were taken during a slow acceleration beam from 2.185 GeV/c to 2.400 crossing kinematic threshold eta meson production in dd->4He-eta 2.336 GeV/c. corresponding excess energy respect 4He-eta system varied -51.4MeV 22MeV. integrated luminosity experiment determined using dd->3Hen reaction. shape examined. No signal bound...
Strong interactions preserve an approximate isospin symmetry between up (u) and down (d) quarks, part of the more general flavor symmetry. In case K meson production, if this were exact, it would result in equal numbers charged (K+ K−) neutral (K0 $${\overline{K}}^{0}$$ ) mesons produced collisions isospin-symmetric atomic nuclei. Here, we report results on relative abundance over production argon scandium nuclei at a center-of-mass energy 11.9 GeV per nucleon pair. We find that K+ K−...
We report on a high-statistics measurement of the most basic double pionic fusion reaction $\vec{n}p \to d\pi^0\pi^0$ over energy region $d^*(2380)$ resonance by use polarized deuteron beam and observing in quasifree scattering mode. The measurements were performed with WASA detector setup at COSY. data reveal substantial analyzing powers confirm conclusions about $d^*$ obtained from unpolarized measurements. also previous under complementary kinematic conditions.
Exclusive and kinematically complete measurements of the double pionic fusion to ${}^{3}\mathrm{He}$ have been performed in energy region so-called ABC effect, which denotes a pronounced low-mass enhancement $\ensuremath{\pi}\ensuremath{\pi}$-invariant mass spectrum. The experiments were carried out with WASA detector setup at COSY (the cooler synchrotron Forschungszentrum J\"ulich). Similar observations basic $pn\ensuremath{\rightarrow}d{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ reaction...
Exclusive measurements of the quasi-free pn→ppπ− and pp→ppπ0 reactions have been performed by means pd collisions at Tp=1.2 GeV using WASA detector setup COSY. Total differential cross sections obtained covering energy region Tp=0.95–1.3GeV (s=2.3–2.46 GeV), which includes regions Δ(1232), ⁎N⁎(1440) ⁎d⁎(2380) resonance excitations. From these isoscalar single-pion production has extracted, for data existed so far only below Tp=1 GeV. We observe a substantial increase this section around 1...
Exclusive and kinematically complete high-statistics measurements of the double pionic fusion reaction $dd \to ^4$He$\pi^0\pi^0$ have been performed in energy range 0.8 - 1.4 GeV covering thus region ABC effect, which denotes a pronounced low-mass enhancement $\pi\pi$-invariant mass spectrum. The experiments were carried out with WASA detector setup at COSY. Similar to observation basic $pn d \pi^0\pi^0$ reaction, data reveal correlation between effect resonance-like dependence total cross...
Dalitz plot distribution of the $\eta\to\pi^+\pi^-\pi^0$ decay is determined using a data sample $1.2\cdot 10^7$ $\eta$ mesons from $pd\to ^3\textrm{He}\eta$ reaction at 1 GeV collected by WASA detector COSY.
Abstract The NA61/SHINE experiment at the CERN Super Proton Synchrotron (SPS) studies onset of deconfinement in hadron matter by a scan particle production collisions nuclei with various sizes set energies covering SPS energy range. This paper presents results on inclusive double-differential spectra, transverse momentum and rapidity distributions mean multiplicities $$\pi ^\pm $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>±</mml:mo>...
The production of $K^{0}_{S}$ mesons in inelastic $\textit{p+p}$ collisions at beam momentum 158 GeV/c ($\sqrt{s_{NN}}=17.3$ GeV) was measured with the NA61/SHINE spectrometer CERN Super Proton Synchrotron. Double-differential distributions were obtained transverse and rapidity. mean multiplicity determined to be $0.162 \pm 0.001 (stat.) 0.011 (sys.)$. results on are compared model predictions (EPOS 1.99, SMASH 2.0, PHSD UrQMD 3.4 models) as well published world data.
The WASA-at-COSY experiment has collected $3\ifmmode\times\else\texttimes\fi{}{10}^{7}$ events with $\ensuremath{\eta}$ mesons produced via the reaction $pd\ensuremath{\rightarrow}^{3}\mathrm{He}\phantom{\rule{0.16em}{0ex}}\ensuremath{\eta}$ at $\mathrm{T}=1.0\phantom{\rule{4pt}{0ex}}\mathrm{GeV}$. Using this data set, we evaluate branching ratios of decays $\ensuremath{\eta}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\gamma}$,...
Using the production reactions $pd\to {}^3\mbox{He}\,\omega$ and $pp\to pp\omega$, Dalitz plot distribution for $\omega \to \pi^+ \pi^- \pi^0$ decay is studied with WASA detector at COSY, based on a combined data sample of $ (4.408\pm 0.042) \times 10^4$ events. The density parametrised by product $P$-wave phase space polynomial expansion in normalised polar variables $Z$ $\phi$. For first time, deviation from pure observed significance $4.1\sigma$. linear term $1+2\alpha Z$, $\alpha$...
Abstract The physics goal of the strong interaction program NA61/SHINE experiment at CERN Super Proton Synchrotron (SPS) is to study phase diagram hadronic matter by a scan particle production in collisions nuclei with various sizes set energies covering SPS energy range. This paper presents differential inclusive spectra transverse momentum, mass and rapidity $$\pi ^{-}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>-</mml:mo> </mml:msup>...
Exclusive measurements of the quasifree pp→ppπ+π− reaction have been carried out at WASA@COSY by means pd collisions Tp=1.2 GeV. Total and differential cross sections extracted covering energy region Tp=1.08–1.36 GeV, which is N∗(1440) Δ(1232)Δ(1232) resonance excitations. Calculations describing these excitations t-channel meson exchange are variance with measured underpredict substantially experimental total section. An isotensor ΔN dibaryon I(JP)=2(1+) produced associatedly a pion able to...
Various theoretical calculations based on QCD or hadronic interactions predict that in addition to the recently observed dibaryon resonance ⁎d⁎(2380) with I(JP)=0(3+) there should also exist a mirrored quantum numbers I(JP)=3(0+). We report here search for such NN-decoupled state data pp→ppπ+π+π−π− reaction. Since no clear-cut evidence has been found, we give upper limits production cross section of mass range 2280–2500 MeV.
This paper presents measurements of production cross sections and inelastic for the following reactions: $60\text{ }\text{ }\mathrm{GeV}/c$ protons with C, Be, Al targets $120\text{ C Be targets. The analysis is performed using NA61/SHINE spectrometer at CERN Super Proton Synchrotron. First are obtained }\mathrm{GeV}/c$, while results compared previously published measurements. These interaction section critical inputs neutrino flux prediction in current future accelerator-based...
Abstract Results on $$\phi $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>ϕ</mml:mi></mml:math> meson production in inelastic $$p + p$$ xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>p</mml:mi><mml:mo>+</mml:mo><mml:mi>p</mml:mi></mml:mrow></mml:math> collisions at CERN SPS energies are presented. They derived from data collected by the NA61/SHINE fixed target experiment, means of invariant mass spectra fits \rightarrow K^+ K^-...