A. Trzupek
A5054786468- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Nuclear reactor physics and engineering
- Distributed and Parallel Computing Systems
- Black Holes and Theoretical Physics
- Nuclear physics research studies
- Stochastic processes and statistical mechanics
- Radiation Detection and Scintillator Technologies
- Medical Imaging Techniques and Applications
- Muon and positron interactions and applications
- Statistical Methods and Bayesian Inference
- Advanced Data Storage Technologies
- Atomic and Subatomic Physics Research
- advanced mathematical theories
- Particle Accelerators and Free-Electron Lasers
- Radiation Therapy and Dosimetry
- Electron and X-Ray Spectroscopy Techniques
- Nuclear Physics and Applications
Institute of Nuclear Physics, Polish Academy of Sciences
2016-2025
The University of Adelaide
2014-2023
European Organization for Nuclear Research
2010-2023
Northern Illinois University
2023
Université Grenoble Alpes
2020
Institut National de Physique Nucléaire et de Physique des Particules
2020
Centre National de la Recherche Scientifique
2020
Institut polytechnique de Grenoble
2020
University of Science and Technology of China
2019
Polish Academy of Sciences
2004-2016
This Letter presents measurements of the elliptic flow charged particles as a function pseudorapidity and centrality from Cu-Cu collisions at 62.4 200 GeV using PHOBOS detector Relativistic Heavy Ion Collider. The in is found to be significant even for most central events. For comparison with Au-Au results, it that detailed way which collision geometry (eccentricity) estimated critical importance when scaling out system-size effects. A new form eccentricity, called participant introduced...
Pseudorapidity distributions of charged particles emitted in $Au+Au$, $Cu+Cu$, $d+Au$, and $p+p$ collisions over a wide energy range have been measured using the PHOBOS detector at RHIC. The centrality dependence both particle multiplicity midrapidity were measured. with $|\eta|<5.4$, which account for between 95% 99% total charged-particle emission associated collision participants, are presented different centralities. Both density, $dN_{ch}/d\eta$, multiplicity, $N_{ch}$, found to...
We present measurements of the pseudorapidity distribution primary charged particles produced in $\mathrm{A}\mathrm{u}+\mathrm{A}\mathrm{u}$ collisions at three energies, $\sqrt{{s}_{NN}}=19.6$, 130, and 200 GeV, for a range collision centralities. The narrows more central excess are high peripheral collisions. For given centrality, however, distributions found to scale with energy according ``limiting fragmentation'' hypothesis. universal fragmentation region described by this scaling grows...
In this paper, we investigate various ways of defining the initial source eccentricity using Monte Carlo Glauber (MCG) approach. particular, examine participant eccentricity, which quantifies shape by major axes ellipse formed interaction points participating nucleons. We show that reasonable variation density parameters in calculation, as well variations how matter production is modeled, do not significantly modify already established behavior a function collision centrality. Focusing on...
We present the first measurement of pseudorapidity densities primary charged particles near midrapidity in Au+Au collisions at sqrt[s(NN)] = 56 and 130 GeV. For most central collisions, we find charged-particle density to be dN/deta|(|eta|<1) 408+/-12(stat)+/-30(syst) GeV 555+/-12(stat)+/-35(syst) GeV, values that are higher than any previously observed nuclear collisions. Compared proton-antiproton our data show an increase per participant by more 40% energy.
A measurement of two-particle correlations with a high transverse momentum trigger particle (p_T^{trig} > 2.5 GeV/c) is presented for Au+Au collisions at sqrt(s_NN) = 200 GeV over the uniquely broad longitudinal acceptance PHOBOS detector (-4 < \Delta\eta 2). broadening away-side azimuthal correlation compared to elementary observed all \Delta\eta. As in p+p collisions, near-side characterized by peak correlated partners small angle relative particle. However, central an additional extended...
We have measured transverse momentum distributions of charged hadrons produced in d+Au collisions at sqrt[s(NN)]=200 GeV. The spectra were obtained for momenta 0.25<p(T)<6.0 GeV/c, a pseudorapidity range 0.2<eta<1.4 the deuteron direction. evolution with collision centrality is presented comparison to p+pmacr; same energy. With increasing centrality, yield high increases more rapidly than overall particle density, leading strong modification spectral shape. This change shape qualitatively...
This Rapid Communication describes the measurement of elliptic flow for charged particles in Au+Au collisions at $\sqrt{{s}_{\mathit{NN}}}=200$ GeV using PHOBOS detector Relativistic Heavy Ion Collider. The measured azimuthal anisotropy is presented over a wide range pseudorapidity three broad collision centrality classes first time this energy. Two distinct methods extracting signal were used to reduce systematic uncertainties. falls sharply with increasing $|\ensuremath{\eta}|$ 200 all...
Multi-particle azimuthal cumulants, often used to study collective flow in high-energy heavy-ion collisions, have recently been applied small collision systems such as $pp$ and $p$+A extract the second-order harmonic $v_2$. Recent observation of four-, six- eight-particle cumulants with "correct sign" $c_2\{4\}<0, c_2\{6\}>0, c_2\{8\}<0$ approximate equality inferred single-particle flow, $v_2\{4\}\approx v_2\{6\}\approx v_2\{8\}$, strong evidence for a emission all soft particles produced...
The charged-particle pseudorapidity density dNch/dη has been measured for Au+Au collisions at √sNN=130GeV RHIC, using the PHOBOS apparatus. total number of charged particles produced 3% most-central |η|≤5.4 is found to be 4200±470. evolution with centrality discussed, and compared model calculations data from proton-induced collisions. show an enhancement in production midrapidity, while fragmentation regions, results are consistent expectations pp pA scattering.Received 6 June...
The PHOBOS experiment has measured the charged particle multiplicity at mid-rapidity in Au+Au collisions sqrt(s_NN) = 200 GeV as a function of collision centrality. Results on dN/deta(eta<1) divided by number participating nucleon pairs, , are presented . As was found from similar data 130 GeV, can be equally well described parton saturation models and two-component fits which include contributions that scale Npart binary collisions, Ncoll. We compare two energies means ratio R(200/130)...
We present transverse momentum distributions of charged hadrons produced in Au+Au collisions at sqrt(s_NN) = 200 GeV. The spectra were measured for momenta p_T from 0.25 to 4.5 GeV/c a rapidity range 0.2 < y_pi 1.4. evolution the is studied as function collision centrality, 65 344 participating nucleons. results are compared data proton-antiproton and lower RHIC energies. find significant change spectral shape between peripheral collisions. Comparing central collisions, we that yields...
This Letter describes the measurement of energy dependence elliptic flow for charged particles in $\mathrm{Au}+\mathrm{Au}$ collisions using PHOBOS detector at Relativistic Heavy Ion Collider. Data taken collision energies $\sqrt{{s}_{NN}}=19.6$, 62.4, 130, and 200 GeV are shown over a wide range pseudorapidity. These results, when plotted as function ${\ensuremath{\eta}}^{\ensuremath{'}}=|\ensuremath{\eta}|\ensuremath{-}{y}_{\mathrm{beam}}$, scale with approximate linearity throughout...
We present results on two-particle angular correlations in Cu+Cu and Au+Au collisions at a center of mass energy per nucleon pair 200 GeV over broad range pseudorapidity ($\eta$) azimuthal angle ($\phi$) as function collision centrality. The PHOBOS detector RHIC has uniquely-large coverage for inclusive charged particles, which allows the study both long- short-range scales. A complex two-dimensional correlation structure $\Delta \eta$ \phi$ emerges, is interpreted context cluster model....
This paper describes the measurement of collective flow for charged particles in Au+Au collisions at sqrt[s(NN)]=130 GeV using PHOBOS detector Relativistic Heavy Ion Collider (RHIC). The measured azimuthal hit anisotropy is presented over a wide range pseudorapidity (-5.0<eta<5.3) first time this energy. result, averaged momenta and particle species, observed to reach 7% peripheral midrapidity, falling off with centrality increasing |eta|. These results call into question common assumption...
We present the first measurement of pseudorapidity density primary charged particles in Au+Au collisions at root square[s(NN)] = 200 GeV. For 6% most central collisions, we obtain dN(ch)/d(eta)/(/eta/<1) 650+/-35(syst). Compared to 130 GeV, highest energy studied previously, an increase by a factor 1.14+/-0.05 90% confidence level, is found. The dependence discussed comparison with data from proton-induced and theoretical predictions.
The centrality dependence of the midrapidity charged particle multiplicity in Au+Au heavy-ion collisions at √sNN=19.6 and 200GeV is presented. Within a simple model, fraction hard (scaling with number binary collisions) to soft participant pairs) interactions consistent value x=0.13±0.01(stat)±0.05(syst) both energies. experimental results energies, scaled by inelastic p(¯p)+p collision data, agree within systematic errors. ratio data was found not depend on over studied range yields linear...
The measured pseudorapidity distribution of primary charged particles in minimum-bias d+Au collisions at sqrt[s(NN)]=200 GeV is presented for the first time. This falls off less rapidly gold direction as compared to deuteron direction. average value particle density midrapidity <dN(ch)/d eta>|eta|< or =0.6)=9.4+/-0.7(syst) and integrated multiplicity region 82+/-6(syst). Estimates total production, based on extrapolations outside region, are also presented. distribution, normalized number...
The measured pseudorapidity distributions of primary charged particles over a wide range $|\ensuremath{\eta}|\ensuremath{\le}5.4$ and integrated particle multiplicities in $d+\mathrm{Au}$ collisions at $\sqrt{{s}_{\mathit{NN}}}=200\phantom{\rule{0.3em}{0ex}}\mathrm{GeV}$ are presented as function collision centrality. longitudinal features found to be very similar those seen $p+A$ lower energies. total multiplicity is scale with the number participants according...
The charged-particle pseudorapidity density for Au+Au collisions at $\sqrt{{s}_{\mathit{NN}}}=62.4$ GeV has been measured over a wide range of impact parameters and compared to results obtained other energies. As function collision energy, the distribution grows systematically both in height width. midrapidity is found grow approximately logarithmically between BNL Alternating Gradient Synchrotron (AGS) energies top Relativistic Heavy Ion Collider (RHIC) energy. There also an approximate...
This article presents results on event-by-event elliptic flow fluctuations in $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{\mathit{NN}}}=$ 200 GeV, where the contribution from non-flow correlations has been subtracted. An analysis method is introduced to measure correlations, relying assumption that are most prominent short ranges ($|\ensuremath{\Delta}\ensuremath{\eta}|<2$). Assuming of order observed $p+p$ for long-range ($|\ensuremath{\Delta}\ensuremath{\eta}|>2$), relative...
We present a measurement of the pseudorapidity density primary charged particles near mid-rapidity in Au+Au collisions at sqrt(s_NN) = 130 GeV as function number participating nucleons. These results are compared to models an attempt discriminate between competing scenarios particle production heavy ion collisions.
Scaled factorial moments, corrected for the shape of single-particle pseudorapidity distribution, are analyzed in and two-dimensional (pseudorapidity azimuth angle) space. An intermittent, power-law growth moments with decreasing bin size is found, analysis revealing a much stronger effect than one-dimensional nucleus-nucleus data. The intermittent patterns more evident proton-nucleus collisions, heaviest nucleus, $^{32}\mathrm{S}$, showing weakest effect.