M. A. Janik
A5107996526- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Nuclear reactor physics and engineering
- Dark Matter and Cosmic Phenomena
- Atomic and Molecular Physics
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Statistical Methods and Bayesian Inference
- X-ray Spectroscopy and Fluorescence Analysis
- Cold Atom Physics and Bose-Einstein Condensates
- Stochastic processes and statistical mechanics
- Radiation Detection and Scintillator Technologies
- Pulsars and Gravitational Waves Research
- Advanced Frequency and Time Standards
- Solar and Space Plasma Dynamics
- Radiation Effects in Electronics
- Muon and positron interactions and applications
- Quantum, superfluid, helium dynamics
- Particle Accelerators and Free-Electron Lasers
- Pediatric Urology and Nephrology Studies
- Census and Population Estimation
- Superconducting Materials and Applications
Warsaw University of Technology
2016-2025
University of Silesia in Katowice
2017-2025
A. Alikhanyan National Laboratory
2015-2024
Central China Normal University
2019-2024
China Institute of Atomic Energy
2023
University of Latvia
2022
Czech Technical University in Prague
2022
University of Brescia
2022
Istituto Nazionale di Fisica Nucleare, Sezione di Pavia
2022
Technical University of Munich
2021
ALICE is the heavy-ion experiment at CERN Large Hadron Collider. The continuously took data during first physics campaign of machine from fall 2009 until early 2013, using proton and lead-ion beams. In this paper we describe running environment handling procedures, discuss performance detectors analysis methods for various observables.
Azimuthal correlations for large transverse momentum charged hadrons have been measured over a wide pseudorapidity range and full azimuth in Au+Au p+p collisions at sqrt[s(NN)]=200 GeV. The small-angle observed all centralities of are characteristic hard-scattering processes previously high-energy collisions. A strong back-to-back correlation exists peripheral Au+Au. In contrast, the reduced considerably most central collisions, indicating substantial interaction as hard-scattered partons or...
Inclusive transverse momentum distributions of charged hadrons within 0.2<p(T)<6.0 GeV/c have been measured over a broad range centrality for Au+Au collisions at sqrt[s(NN)]=130 GeV. Hadron yields are suppressed high p(T) in central relative to peripheral and nucleon-nucleon reference scaled collision geometry. Peripheral not the reference. The suppression varies continuously intermediate centralities. results indicate significant nuclear medium effects on high-p(T) hadron production...
Elliptic flow holds much promise for studying the early-time thermalization attained in ultrarelativistic nuclear collisions. Flow measurements also provide a means of distinguishing between hydrodynamic models and calculations which approach low density (dilute gas) limit. Among effects that can complicate interpretation elliptic are azimuthal correlations unrelated to reaction plane (non-flow correlations). Using data Au + collisions at sqrt{s_{NN}} = 130 GeV from STAR TPC, it is found...
We report first results on elliptic flow of identified particles at midrapidity in $\mathrm{Au}+\mathrm{Au}$ collisions $\sqrt{{s}_{\mathrm{NN}}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}130\mathrm{GeV}$ using the STAR TPC RHIC. The as a function transverse momentum and centrality differs significantly for different masses. This dependence can be accounted hydrodynamic models, indicating that system created shows behavior consistent with collective hydrodynamical flow. fit to data...
Two-pion correlation functions in Au+Au collisions at $\sqrt{s_{NN}} = 130$ GeV have been measured by the STAR (Solenoidal Tracker RHIC) detector. The source size extracted fitting correlations grows with event multiplicity and decreases transverse momentum. Anomalously large sizes or emission durations, which suggested as signals of quark-gluon plasma formation rehadronization, are not observed. HBT parameters display a weak energy dependence over broad range $\sqrt{s_{NN}}$.
We report on laser cooling of a large fraction positronium (Ps) in free flight by strongly saturating the 1^{3}S-2^{3}P transition with broadband, long-pulsed 243 nm alexandrite laser. The ground state Ps cloud is produced magnetic and electric field-free environment. observe two different laser-induced effects. first effect an increase number atoms after time has spent long-lived 2^{3}P states. second one-dimensional Doppler Ps, reducing cloud's temperature from 380(20) to 170(20) K....
Azimuthal anisotropy (v(2)) and two-particle angular correlations of high p(T) charged hadrons have been measured in Au+Au collisions at sqrt[s(NN)]=130 GeV for transverse momenta up to 6 GeV/c, where hard processes are expected contribute significantly. The exhibit elliptic flow a structure suggestive fragmentation partons. monotonic rise v(2)(p(T)) p(T)<2 GeV/c is consistent with collective hydrodynamical calculations. At p(T)>3 saturation v(2) observed which persists p(T)=6 GeV/c.
The minimum-bias multiplicity distribution and the transverse momentum pseudorapidity distributions for central collisions have been measured negative hadrons ( h(-)) in Au+Au interactions at square root of ([s(NN)]) = 130 GeV. density midrapidity 5% most is dN(h(-))/d(eta)/(eta 0) 280+/-1(stat)+/-20(syst), an increase per participant 38% relative to pp same energy. mean 0.508+/-0.012 GeV/c larger than Pb+Pb lower energies. scaling h(-) yield a strong function p( perpendicular). almost...
We report the first measurement of strange (Lambda) and antistrange (Lambda macro) baryon production from square root [s(NN)]=130 GeV Au+Au collisions at Relativistic Heavy Ion Collider (RHIC). Rapidity density transverse mass distributions midrapidity are presented as a function centrality. The yield Lambda Lambda; hyperons is found to be approximately proportional number negative hadrons. relative hadrons increases very rapidly with momentum. magnitude increase cannot described by existing...
We report results on the ratio of midrapidity antiproton-to-proton yields in Au+Au collisions at sqrt[s(NN)] = 130 GeV per nucleon pair as measured by STAR experiment RHIC. Within rapidity and transverse momentum range /y/<0.5 0.4<p(t)<1.0 GeV/c, is essentially independent either or rapidity, with an average 0.65+/-0.01((stat))+/-0.07((syst)) for minimum bias collisions. errors, no strong centrality dependence observed. The indicate that this RHIC energy, although p-p production becomes...
The STAR Collaboration reports the first observation of exclusive rho(0) photoproduction, AuAu-->AuAurho(0), and production accompanied by mutual nuclear Coulomb excitation, AuAu-->Au*Au*rho(0), in ultraperipheral heavy-ion collisions. have low transverse momenta, consistent with coherent coupling to both nuclei. cross sections at sqrt[s(NN)]=130 GeV agree theoretical predictions treating excitation as independent processes.
We report STAR results on the azimuthal anisotropy parameter v2 for strange particles K0S, L and Lbar at midrapidity in Au+Au collisions sNN = 130 GeV RHIC. The value of as a function transverse momentum produced pt collision centrality is presented both up to 3.0 GeV/c. A strong dependence observed 2.0 measurement compared with hydrodynamic model calculations. physics implications integrated magnitude particle mass are also discussed.
The balance function is a new observable based on the principle that charge locally conserved when particles are pair produced. Balance functions have been measured for charged particle pairs and identified pion in Au+Au collisions at square root of SNN = 130 GeV Relativistic Heavy Ion Collider using STAR. peripheral widths consistent with model predictions superposition nucleon-nucleon scattering. Widths central smaller, trends predicted by models incorporating late hadronization.
The first collisions of lead nuclei, delivered by the CERN Large Hadron Collider (LHC) at end 2010, a centre-of-mass energy per nucleon pair sNN= 2.76 TeV, marked beginning new era in ultra-relativistic heavy-ion physics. Following Run 1 period, LHC also successfully Pb–Pb collision 5.02 TeV 2015. study properties produced hot and dense strongly-interacting matter these unprecedented energies is experimentally pursued all four big experiments, ALICE, ATLAS, CMS, LHCb. This review presents...
We report the first measurement of inclusive antiproton production at midrapidity in Au+Au collisions square root s(NN) = 130 GeV by STAR experiment RHIC. The transverse mass distributions measured momentum range 0.25<p( perpendicular)<0.95 GeV/c are found to fall less steeply for more central collisions. extrapolated rapidity density is scale approximately with negative hadron multiplicity density.
We present the first measurement of midrapidity vector meson φ production in Au+Au collisions at RHIC (√sNN=130GeV) from STAR detector. For 11% highest multiplicity collisions, slope parameter an exponential fit to transverse mass distribution is T=379±50(stat)±45(syst)MeV, yield dN/dy=5.73±0.37(stat)±0.69(syst) per event, and ratio Nφ/Nh− found be 0.021±0.001(stat)±0.004(syst). The measured T for do not change selected bins.Received 17 August...
The first measurements of light antinucleus production in Au+Au collisions at the Relativistic Heavy-Ion Collider are reported. observed rates for d macro and (3)He much larger than lower energy nucleus-nucleus collisions. A coalescence model analysis yields indicates that there is little or no increase antinucleon freeze-out volume compared to CERN SPS energy. These analyses also indicate smaller volume.
Mid-rapidity transverse mass spectra and multiplicity densities of charged neutral kaons are reported for Au+Au collisions at $\snn$=130 GeV RHIC. The exponential in mass, with an inverse slope about 280 MeV central collisions. these particles scale the negative hadron pseudo-rapidity density. kaon to pion ratios $K^+/\pi^- = 0.161 \pm 0.002 {\rm (stat)} 0.024 (syst)}$ $K^-/\pi^- 0.146 0.022 most $K^+/\pi^-$ ratio is lower than same observed SPS while $K^-/\pi^-$ higher result. Both enhanced...
Abstract A powerful and robust control system is a crucial, often neglected, pillar of any modern, complex physics experiment that requires the management multitude different devices their precise time synchronisation. The AEḡIS collaboration presents CIRCUS, novel, autonomous optimised for time-critical experiments such as those at CERN’s Antiproton Decelerator and, more broadly, in atomic quantum research. Its setup based on Sinara/ARTIQ TALOS, integrating ALPACA analysis pipeline, last...
We report the first observation of ${K}^{*}{(892)}^{0}\ensuremath{\rightarrow}\ensuremath{\pi}K$ in relativistic heavy ion collisions. The transverse momentum spectrum ${(K}^{*0}+{K}^{*0})/2$ from central $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{{}_{\mathrm{NN}}}}=130\mathrm{GeV}$ is presented. ratios ${K}^{*0}$ yield derived these data to yields negative hadrons, charged kaons, and $\ensuremath{\varphi}$ mesons have been measured minimum bias compared with model predictions...
Antihydrogen formation at AEgIS CERN leverages charge exchange between Rydberg positronium (Ps*) and antiprotons, with cross-sections scaling the Ps principal quantum number $n^4$ inversely relative velocity $𝑣^{−2}$. However, motional Stark effect mismatch antiprotons impose stringent constraints, limiting efficiency. Advances in transmission converters mitigate self-ionization losses improve alignment, promising a significant boost antihydrogen yield. This work evaluates cross-sections,...
The experimental demonstration of positronium laser cooling with stationary broadband pulses negative detuning is briefly described. Considerations on the limits current experiment and possible future developments follow. In particular, benefit positron remoderation, use a magnetic field, polarization, pulse shaping, coherent deceleration are shortly discussed.