A. Rybicki
A5103282590- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Nuclear reactor physics and engineering
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Nuclear physics research studies
- Pulsars and Gravitational Waves Research
- Statistical Methods and Bayesian Inference
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Stochastic processes and statistical mechanics
- Scientific Research and Discoveries
- Theoretical and Computational Physics
- Distributed and Parallel Computing Systems
- Computational Physics and Python Applications
- Geomagnetism and Paleomagnetism Studies
- Cold Atom Physics and Bose-Einstein Condensates
- Black Holes and Theoretical Physics
- Polish Historical and Cultural Studies
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Modeling and Simulation Systems
Institute of Nuclear Physics, Polish Academy of Sciences
2016-2025
Polish Academy of Sciences
2006-2025
A. Alikhanyan National Laboratory
2015-2024
Cracow University of Technology
1980-2024
National and Kapodistrian University of Athens
1999-2022
Cyprus Institute
2022
National Museum in Kraków
2020
Rzeszów University
2017
European Organization for Nuclear Research
2003-2013
Academy of Scientific Research and Technology
2013
The design, construction, and commissioning of the ALICE Time-Projection Chamber (TPC) is described. It main device for pattern recognition, tracking, identification charged particles in experiment at CERN LHC. TPC cylindrical shape with a volume close to 90 m^3 operated 0.5 T solenoidal magnetic field parallel its axis. In this paper we describe detail design considerations detector operation extreme multiplicity environment central Pb--Pb collisions LHC energy. implementation resulting...
Measurements of charged pion and kaon production in central Pb+Pb collisions at 40, 80, 158 A GeV are presented. These compared with data lower higher energies as well results from $p+p$ interactions. The mean multiplicity per wounded nucleon increases approximately linearly ${s}_{\mathrm{NN}}^{1/4}$ a change slope starting the region 15--40 GeV. suppression respect to interactions, observed low collision energies, enhancement high occurs about 40A nonmonotonic energy dependence ratio...
Results on charged pion and kaon production in central Pb+Pb collisions at 20A 30A GeV are presented compared to data lower higher energies. A rapid change of the energy dependence is observed around for yields pions kaons as well shape transverse mass spectra. The compatible with prediction that threshold a state deconfined matter early stage located low SPS
Directed and elliptic flow measurements for charged pions protons are reported as a function of transverse momentum, rapidity, centrality 40A 158AGeV Pb+Pb collisions, recorded by the NA49 detector. Both standard method correlating particles with an event plane cumulant studying multiparticle correlations used. In directed is corrected conservation momentum. reconstructed from genuine four-, six-, eight-particle correlations, showing first unequivocal evidence collective motion in A+A...
Results of resonance searches in the Xi(-)pi(-), Xi(-)pi(+), Xi;(+)pi(-), and Xi;(+)pi(+) invariant mass spectra proton-proton collisions at sqrt[s]=17.2 GeV are presented. Evidence is shown for existence a narrow Xi(-)pi(-) baryon with 1.862+/-0.002 GeV/c(2) width below detector resolution about 0.018 GeV/c(2). The significance estimated to be above 4.2sigma. This state candidate hypothetical exotic Xi(--)(3/2) S=-2, I=3 / 2, quark content (dsdsū). At same mass, peak observed Xi(-)pi(+)...
Net proton and negative hadron spectra for central \PbPb collisions at 158 GeV per nucleon the CERN SPS were measured compared to from lighter systems. baryon distributions derived those of net protons, utilizing model calculations isospin contributions as well data strange distributions. Stopping (rapidity shift with respect beam) mean transverse momentum \meanpt baryons increase system size. The rapidity density hadrons scales number participant nucleons nuclear collisions, whereas their...
$\ensuremath{\phi}$ meson production is studied by the NA49 Collaboration in central $\mathrm{Pb}+\mathrm{Pb}$ collisions at $20A,30A,40A,80A$, and $158A$ GeV beam energy. The data are compared with measurements lower higher energies microscopic thermal models. energy dependence of yields spectral distributions compatible assumption that partonic degrees freedom set low SPS energies.
The directed and elliptic flow of protons charged pions has been observed from the semicentral collisions a 158 GeV/nucleon Pb beam with target. rapidity transverse momentum dependence measured. is opposite to that but both exhibit negative at low pt. fairly independent rises pt.Received 10 November 1997DOI:https://doi.org/10.1103/PhysRevLett.80.4136©1998 American Physical Society
The transverse mass ${m}_{t}$ distributions for antiprotons are measured at midrapidity minimum bias Pb+Pb collisions 158A GeV and central 20A, 30A, 40A, 80A beam energies in the fixed target experiment NA49 CERN SPS. rapidity density $\mathit{dn}/\mathit{dy}$, inverse slope parameter T, mean $\ensuremath{\langle}{m}_{t}\ensuremath{\rangle}$ derived from studied as a function of incident energy collision centrality compared to relevant data on proton production. shapes $\overline{p}$ p very...
Results on $\Lambda$, $\bar{\Lambda}}$, $\Xi^{-}$, and $\bar{\Xi}^{+}$ production in central Pb+Pb reactions at 20A, 30A, 40A, 80A, 158A GeV are presented. The energy dependence of transverse mass spectra, rapidity multiplicities is discussed. Comparisons to string hadronic models (UrQMD HSD) statistical hadron gas shown. While the latter provide a reasonable description all particle yields, first class fails match multiplicities.
The transverse mass ${m}_{t}$ distributions for deuterons and protons are measured in $\text{Pb}+\text{Pb}$ reactions near midrapidity the range $0<{m}_{t}\ensuremath{-}m<1.0\phantom{\rule{0.3em}{0ex}}(1.5)\phantom{\rule{0.3em}{0ex}}\text{GeV}∕{c}^{2}$ minimum bias collisions at $158A\phantom{\rule{0.3em}{0ex}}\text{GeV}$ central 40 $80\phantom{\rule{0.3em}{0ex}}A\phantom{\rule{0.3em}{0ex}}\text{GeV}$ beam energies. rapidity density $dn∕dy$, inverse slope parameter $T$ mean $⟨{m}_{t}⟩$...
Production of $d,\phantom{\rule{0.16em}{0ex}}t$, and $^{3}\mathrm{He}$ nuclei in central $\mathrm{Pb}+\mathrm{Pb}$ interactions was studied at five collision energies ($\sqrt{{s}_{NN}}=6.3$, 7.6, 8.8, 12.3, 17.3 GeV) with the NA49 detector CERN Super Proton Synchrotron. Transverse momentum spectra, rapidity distributions, particle ratios were measured. Yields are compared to predictions statistical models. Phase-space distributions light discussed those protons context a coalescence...
The yields of (anti)protons were measured by the NA49 Collaboration in centrality-selected Pb $+$ collisions at $40A$ and $158A$ GeV. Particle identification was obtained laboratory momentum range from 5 to 63 GeV$/c$ measuring energy loss $dE/dx$ time projection chamber detector gas. corresponding rapidity coverage extends 1.6 units midrapidity into forward hemisphere. Transverse-mass spectra, dependences average transverse mass, density distributions studied as a function collision...
Production of Lambda and Antilambda hyperons was measured in central Pb-Pb collisions at 40, 80, 158 A$\cdot$GeV beam energy on a fixed target. Transverse mass spectra rapidity distributions are given for all three energies. The $\Lambda/\pi$ ratio mid-rapidity full phase space shows pronounced maximum between the highest AGS 40 SPS energies, whereas $\bar{\Lambda}/\pi$ exhibits monotonic increase.
Results are presented on event-by-event fluctuations in transverse momentum of charged particles, produced at forward rapidities p+p, C+C, Si+Si and Pb+Pb collisions 158 AGeV. Three different characteristics discussed: the average event, Phi_pT fluctuation measure two-particle correlations. In kinematic region explored, dynamical found to be small. However, a significant system size dependence is observed, with largest value measured peripheral interactions. The data compared predictions...
We look for fluctuations expected the QCD critical point using an intermittency analysis in transverse momentum phase space of protons produced around midrapidity 12.5 % most central C+C, Si+Si and Pb+Pb collisions at maximum SPS energy 158A GeV. find evidence power-law data. The fitted exponent $$\phi _{2} = 0.96^{+0.38}_{-0.25}\text { (stat.)}$$ $$\pm $$ $$0.16\text (syst.)}$$ is consistent with value fluctuations. Power-law had previously also been observed low-mass $$\pi ^+ \pi ^-$$...
We present the first measurement of fluctuations from event to in production strange particles collisions heavy nuclei. The ratio charged kaons pions is determined for individual central Pb+Pb collisions. After accounting due detector resolution and finite number statistics we derive an upper limit on genuine nonstatistical fluctuations, which could be related a first- or second-order QCD phase transition. Such are shown very small.
We present measurements of the energy dependence event-by-event fluctuations in K/pi and (p + \bar{p})/pi multiplicity ratios heavy ion collisions at CERN SPS. The particle ratio were obtained for central Pb+Pb five collision energies, \sqrt{s_{_{NN}}}, between 6.3 17.3 GeV. After accounting effects finite-number statistics detector resolution, we extract strength non-statistical each energy. For ratio, larger than expected independent production are found all energies. smaller expectations...
New data on the production of protons, anti-protons and neutrons in p+p interactions are presented. The come from a sample 4.8 million inelastic events obtained with NA49 detector at CERN SPS 158 GeV/c beam momentum. charged baryons identified by energy loss measurement large TPC tracking system. Neutrons detected forward hadronic calorimeter. Inclusive invariant cross sections intervals 0 to 1.9 (0 1.5 GeV/c) transverse momentum -0.05 0.95 (-0.05 0.4) Feynman x for protons (anti-protons),...
Multiplicity fluctuations of positively, negatively and all charged hadrons in the forward hemisphere were studied central Pb+Pb collisions at 20A, 30A, 40A, 80A 158A GeV. The multiplicity distributions their scaled variances are presented dependence collision energy as well rapidity transverse momentum. have bell-like shape range from 0.8 to 1.2 without any significant structure dependence. No indication critical point observed. string-hadronic model UrQMD significantly overpredicts mean,...