S. Harabasz
A5054491123- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Nuclear reactor physics and engineering
- Nuclear physics research studies
- Stochastic processes and statistical mechanics
- Particle Detector Development and Performance
- Fusion materials and technologies
- Cosmology and Gravitation Theories
- X-ray Spectroscopy and Fluorescence Analysis
- Markov Chains and Monte Carlo Methods
- Fluid Dynamics and Turbulent Flows
- Geological and Geochemical Analysis
- Ion-surface interactions and analysis
- Gas Dynamics and Kinetic Theory
- Pulsars and Gravitational Waves Research
- Nuclear Physics and Applications
- Crystallography and Radiation Phenomena
- Appendicitis Diagnosis and Management
- Plasma and Flow Control in Aerodynamics
- Gamma-ray bursts and supernovae
- Nuclear Materials and Properties
- Geochemistry and Geologic Mapping
- Statistical Mechanics and Entropy
Technical University of Darmstadt
2016-2025
Max Planck Institute for Nuclear Physics
2025
Eötvös Loránd University
2024
Argonne National Laboratory
2023-2024
Ball State University
2023-2024
Jagiellonian University
2012-2023
Institute of Physics
2012-2023
State University of New York
2023
Abilene Christian University
2020-2023
Stony Brook University
2023
Non-monotonic variation with collision energy ($\sqrt{s_{\rm NN}}$) of the moments net-baryon number distribution in heavy-ion collisions, related to correlation length and susceptibilities system, is suggested as a signature for Quantum Chromodynamics (QCD) critical point. We report first evidence non-monotonic kurtosis times variance net-proton (proxy number) function \rootsnn 3.1$\sigma$ significance, head-on (central) gold-on-gold (Au+Au) collisions measured using STAR detector at RHIC....
We report a systematic measurement of cumulants, $C_{n}$, for net-proton, proton and antiproton multiplicity distributions, correlation functions, $\kappa_n$, distributions up to the fourth order in Au+Au collisions at $\sqrt{s_{\mathrm {NN}}}$ = 7.7, 11.5, 14.5, 19.6, 27, 39, 54.4, 62.4 200 GeV. The $C_{n}$ $\kappa_n$ are presented as function collision energy, centrality kinematic acceptance rapidity, $y$, transverse momentum, $p_{T}$. data were taken during first phase Beam Energy Scan...
In heavy-ion collision experiments, the global collectivity of final-state particles can be quantified by anisotropic flow coefficients (𝑣𝑛). The first-order coefficient, also referred to as directed (𝑣1), describes collective sideward motion produced and nuclear fragments in collisions. It carries information on very early stage collision, especially at large pseudorapidity (𝜂), where it is believed generated during passage time. Directed therefore probes onset bulk dynamics thermalization,...
Global polarization of Ξ and Ω hyperons has been measured for the first time in Au+Au collisions at sqrt[s_{NN}]=200 GeV. The measurements Ξ^{-} Ξ[over ¯]^{+} hyperon have performed by two independent methods, via analysis angular distribution daughter particles parity violating weak decay Ξ→Λ+π, as well measuring Λ hyperon, polarized transfer from its parent. polarization, obtained combining results methods averaged over ¯]^{+}, is to be ⟨P_{Ξ}⟩=0.47±0.10(stat)±0.23(syst)% collision...
We present an analysis of proton number fluctuations in $\sqrt{s_{NN}}$ = 2.4 GeV Au+Au collisions measured with the High-Acceptance DiElectron Spectrometer (HADES) at GSI. With help extensive detector simulations done IQMD transport model events including nuclear clusters, various nuisance effects influencing observed cumulants have been investigated. Acceptance and efficiency corrections applied as a function fine grained rapidity transverse momentum bins, well considering local track...
We report the beam energy and collision centrality dependence of fifth sixth order cumulants (C5, C6) factorial (κ5, κ6) net-proton proton number distributions, from center-of-mass (√sNN) 3 GeV to 200 Au+Au collisions at RHIC. Cumulant ratios (taken as proxy for net-baryon) distributions generally follow hierarchy expected QCD thermodynamics, except case GeV. The measured values C6/C2 0%–40% show progressively negative trend with decreasing energy, while it is positive lowest studied. These...
Flow coefficients $v_{n}$ of the orders $n = 1 - 6$ are measured with High-Acceptance DiElectron Spectrometer (HADES) at GSI for protons, deuterons and tritons as a function centrality, transverse momentum rapidity in Au+Au collisions $\sqrt{s_{NN}} 2.4$ GeV. Combining information from flow all allows to construct first time, collision energies few GeV, multi-differential picture angular emission pattern these particles. It reflects complicated interplay between effect central fireball...
The chiral magnetic effect (CME) refers to charge separation along a strong field due imbalanced chirality of quarks in local parity and charge-parity violating domains quantum chromodynamics. experimental measurement the is made difficult by presence major background from elliptic azimuthal anisotropy. This CME signal have different sensitivities spectator participant planes, could thus be determined measurements with respect these planes. We report such Au+Au collisions at nucleon-nucleon...
In high-energy heavy-ion collisions, partonic collectivity is evidenced by the constituent quark number scaling of elliptic flow anisotropy for identified hadrons. A breaking this and dominance baryonic interactions found hadron collective measurements in $\sqrt{s_{\rm NN}}$ = 3 GeV Au+Au collisions. paper, we report first- second-order azimuthal anisotropic parameters, $v_1$ $v_2$, light nuclei ($d$, $t$, $^{3}$He, $^{4}$He) produced collisions at STAR experiment. An atomic mass measured...
The global polarization of {\Lambda} hyperons along the total orbital angular momentum a relativistic heavy-ion collision is presented based on high statistics data samples collected in Au+Au collisions at \sqrt{s_{NN}} = 2.4 GeV and Ag+Ag 2.55 with High-Acceptance Di-Electron Spectrometer (HADES) GSI, Darmstadt. This first measurement below strangeness production threshold nucleon-nucleon collisions. Results are reported as function centrality well hyperon transverse (p_T) rapidity (y_{CM})...
We report a measurement of exclusive J/ψ and ψ(2s) photoproduction in Au+Au ultraperipheral collisions at sNN=200 GeV using the STAR detector. For first time, (i) midrapidity Relativistic Heavy-Ion Collider has been experimentally measured; (ii) nuclear suppression factors are measured for both coherent incoherent production. At average photon-nucleon center-of-mass energy 25.0 GeV, cross sections Au nuclei found to be 71±10% 36±7%, respectively, that free protons. The stronger observed...
The STAR Collaboration at the Relativistic Heavy Ion Collider reports first measurement of inclusive jet production in peripheral and central Au+Au collisions $\sqrt{{s}_{NN}}=200$ GeV. Jets are reconstructed with anti-${k}_{T}$ algorithm using charged tracks pseudorapidity $|\ensuremath{\eta}|<1.0$ transverse momentum $0.2<{p}_{T,\mathrm{jet}}^{\mathrm{ch}}<30$ $\mathrm{GeV}/c$, resolution parameter $R=0.2$, 0.3, 0.4. large background yield uncorrelated signal is observed to be dominated by...
We report on measurements of sequential ϒ suppression in Au+Au collisions at sqrt[s_{NN}]=200 GeV with the STAR detector Relativistic Heavy Ion Collider (RHIC) through both dielectron and dimuon decay channels. In 0%-60% centrality class, nuclear modification factors (R_{AA}), which quantify level yield heavy-ion compared to p+p collisions, for ϒ(1S) ϒ(2S) are 0.40±0.03(stat)±0.03(sys)±0.09(norm) 0.26±0.08(stat)±0.02(sys)±0.06(norm), respectively, while upper limit ϒ(3S) R_{AA} is 0.17 a 95%...
Abstract High-precision measurements of flow coefficients $$v_{n}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>v</mml:mi> <mml:mi>n</mml:mi> </mml:msub> </mml:math> ( $$n = 1 - 4$$ <mml:mrow> <mml:mo>=</mml:mo> <mml:mn>1</mml:mn> <mml:mo>-</mml:mo> <mml:mn>4</mml:mn> </mml:mrow> ) for protons, deuterons and tritons relative to the first-order spectator plane have been performed in Au+Au collisions at $$\sqrt{s_{_{{\text {NN}}}}}= 2.4$$ <mml:msqrt>...
In relativistic heavy-ion collisions, a global spin polarization, $P_\mathrm{H}$, of $\Lambda$ and $\bar{\Lambda}$ hyperons along the direction system angular momentum was discovered measured across broad range collision energies demonstrated trend increasing $P_\mathrm{H}$ with decreasing $\sqrt{s_{\rm NN}}$. A splitting between polarization may be possible due to their different magnetic moments in late-stage field sustained by quark-gluon plasma which is formed collision. The results...
Measurements of exclusive $J/\ensuremath{\psi}, \ensuremath{\psi}(2s)$, and electron-positron (${e}^{+}{e}^{\ensuremath{-}}$) pair photoproduction in $\mathrm{Au}+\mathrm{Au}$ ultraperipheral collisions are reported by the STAR experiment at $\sqrt{{s}_{{}_{\mathrm{NN}}}}=200\phantom{\rule{4pt}{0ex}}\mathrm{GeV}$. We report several first measurements BNL Relativistic Heavy Ion Collider, which (i) $J/\ensuremath{\psi}$ with large momentum transfer up to...
We present data on charged kaons (K+-) and {\phi} mesons in Au(1.23A GeV)+Au collisions. It is the first simultaneous measurement of K central heavy-ion collisions below a kinetic beam energy 10A GeV. The {\phi}/K- multiplicity ratio found to be surprisingly high with value 0.52 +- 0.16 shows no dependence centrality collision. Consequently, different slopes K+ K- transverse-mass spectra can explained solely by feed- down, which substantially softens mesons. Hence, contrast commonly adapted...
In this letter, measurements of the shared momentum fraction (zg) and groomed jet radius (Rg), as defined in SoftDrop algorithm, are reported p+p collisions at s=200 GeV collected by STAR experiment. These substructure observables differentially measured for jets varying resolution parameters from R=0.2−0.6 transverse range 15<pT,jet<60 GeV/c. studies show that, pT,jet accessible with increasing parameter momentum, zg distribution asymptotically converges to DGLAP splitting kernel a quark...