A5074909278- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Nuclear reactor physics and engineering
- Urological Disorders and Treatments
- Bladder and Urothelial Cancer Treatments
- Prostate Cancer Diagnosis and Treatment
- Stochastic processes and statistical mechanics
- Renal and Vascular Pathologies
- Kidney Stones and Urolithiasis Treatments
- Urinary Bladder and Prostate Research
- Fusion materials and technologies
- Colorectal Cancer Surgical Treatments
- Urologic and reproductive health conditions
- Stoma care and complications
- Statistical Methods and Bayesian Inference
- Particle Accelerators and Free-Electron Lasers
- Hormonal and reproductive studies
- X-ray Spectroscopy and Fluorescence Analysis
- Pediatric Urology and Nephrology Studies
- Ureteral procedures and complications
- Nuclear physics research studies
- Genital Health and Disease
- Markov Chains and Monte Carlo Methods
- Urinary and Genital Oncology Studies
Czech Technical University in Prague
2018-2024
Ocní klinika
2019-2024
Ball State University
2024
Guangxi Normal University
2024
Central China Normal University
2024
Argonne National Laboratory
2024
Frankfurt Institute for Advanced Studies
2024
Creighton University
2024
Huzhou University
2024
Czech Academy of Sciences, Nuclear Physics Institute
2023
The Λ (Λ[over ¯]) hyperon polarization along the beam direction has been measured in Au+Au collisions at sqrt[s_{NN}]=200 GeV, for first time heavy-ion collisions. dependence on hyperons' emission angle relative to elliptic flow plane exhibits a second harmonic sine modulation, indicating quadrupole pattern of vorticity component direction, expected due flow. is found increase more peripheral collisions, and shows no strong transverse momentum (p_{T}) p_{T} greater than 1 GeV/c. magnitude...
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....
The Breit-Wheeler process which produces matter and anti-matter from photon collisions is investigated experimentally through the observation of 6085 exclusive electron-positron pairs in ultra-peripheral Au+Au at $\sqrt{s_{_{NN}}}=200$ GeV. measurements reveal a large fourth-order angular modulation $\cos{4\Delta\phi}=(16.8\pm2.5)\%$ smooth invariant mass distribution absent vector mesons ($\phi$, $\omega$ $\rho$) experimental limit $\le 0.2\%$ observed yields. differential cross section as...
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...
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%...
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...
We report the first measurements of a complete second-order cumulant matrix net-charge, net-proton, and net-kaon multiplicity distributions for phase beam energy scan program at Relativistic Heavy Ion Collider. This includes centrality and, time, pseudorapidity window dependence both diagonal off-diagonal cumulants in $\mathrm{Au}+\mathrm{Au}$ collisions $\sqrt{{s}_{NN}}$= 7.7--200 GeV. Within available acceptance $|\ensuremath{\eta}|<0.5$, grow linearly with window. Relative to...
We report on the first measurements of J/$\psi$ production at very low transverse momentum ($p_{T} <$ 0.2 GeV/c) in hadronic Au+Au collisions $\sqrt{s_{\rm{NN}}} =$ 200 GeV and U+U 193 GeV. Remarkably, inferred nuclear modification factor mid-rapidity (U+U) reaches about 24 (52) for $p_{T} 0.05 GeV/c 60-80$\%$ collision centrality class. This noteworthy enhancement cannot be explained by accompanied cold hot medium effects. In addition, $dN/dt$ distribution $p_{T}$ range is presented time....
Quark interactions with topological gluon configurations can induce chirality imbalance and local parity violation in quantum chromodynamics. This lead to electric charge separation along the strong magnetic field relativistic heavy-ion collisions -- chiral effect (CME). We report measurements by STAR collaboration of a CME-sensitive observable $p$+Au $d$+Au at 200 GeV, where CME is not expected, using charge-dependent pair correlations relative third particle. observe similar those measured...
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...
Density fluctuations near the QCD critical point can be probed via an intermittency analysis in relativistic heavy-ion collisions. We report first measurement of Au+Au collisions at sNN = 7.7-200 GeV measured by STAR experiment Relativistic Heavy Ion Collider (RHIC). The scaled factorial moments identified charged hadrons are analyzed mid-rapidity and within transverse momentum phase space. observe a power-law behavior decrease extracted scaling exponent (ν) from peripheral to central ν is...
We report new STAR measurements of the single-spin asymmetries ${A}_{L}$ for ${W}^{+}$ and ${W}^{\ensuremath{-}}$ bosons produced in polarized proton-proton collisions at $\sqrt{s}=510\text{ }\text{ }\mathrm{GeV}$ as a function decay-positron decay-electron pseudorapidity. The data were obtained 2013 correspond to an integrated luminosity $250\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$. results are combined with previous $86\text{ A comparison theoretical expectations based on lepton-nucleon...
We report on the $W$ and $Z/\gamma^*$ differential total cross sections as well $W^+$/$W^-$ $(W^+ + W^-)$/$(Z/\gamma^*)$ cross-section ratios measured by STAR experiment at RHIC in $p+p$ collisions $\sqrt{s} = 500$ GeV $510$ GeV. The their are sensitive to quark antiquark parton distribution functions. In particular, leading order, ratio is $\bar{d}/\bar{u}$ ratio. These measurements were taken high $Q^2 \sim M_W^2,M_Z^2$ can serve input into global analyses provide constraints sea...
The STAR Collaboration reports measurements of the transverse single-spin asymmetry (TSSA) inclusive $\pi^0$ at center-of-mass energies ($\sqrt s$) 200 GeV and 500 in transversely polarized proton-proton collisions pseudo-rapidity region 2.7 to 4.0. results two different show a continuous increase TSSA with Feynman-$x$, and, when compared previous measurements, no dependence on $\sqrt s$ from 19.4 is found. To investigate underlying physics leading this large TSSA, topologies have been...
A decisive experimental test of the Chiral Magnetic Effect (CME) is considered one major scientific goals at Relativistic Heavy-Ion Collider (RHIC) towards understanding nontrivial topological fluctuations Quantum Chromodynamics vacuum. In heavy-ion collisions, CME expected to result in a charge separation phenomenon across reaction plane, whose strength could be strongly energy dependent. The previous searches have been focused on top RHIC collisions. this Letter, we present low search for...
We report systematic measurements of dielectron (${e}^{+}{e}^{\ensuremath{-}}$) invariant-mass ${M}_{ee}$ spectra at midrapidity in $\mathrm{Au}+\mathrm{Au}$ collisions $\sqrt{{s}_{NN}}$ = 27, 39, and 62.4 GeV taken with the STAR detector Relativistic Heavy Ion Collider. For all energies studied, a significant excess yield dielectrons is observed low-mass region ($0.40<{M}_{ee}<0.75 \mathrm{MeV}/{c}^{2}$) compared to hadronic cocktail simulations freeze-out. Models that include an in-medium...
Various models of the QCD phase diagram favor a first-order transition to quark-gluon plasma, and therefore critical endpoint which could manifest itself in measurable fluctuations correlations. The authors report measurements moments net proton multiplicity (cumulants) correlation functions from RHIC beam energy scan. They establish that at $\sqrt{{s}_{N\phantom{\rule{0}{0ex}}N}}=3$ GeV produced system is dominated by hadronic rather than thermal interactions. This puts limit on search for...
The measurements of particle multiplicity distributions have generated considerable interest in understanding the fluctuations conserved quantum numbers Quantum Chromodynamics (QCD) hadronization regime, particular near a possible critical point and chemical freeze-out. We report measurement efficiency centrality bin width corrected cumulant ratios ($C_{2}/C_{1}$, $C_{3}/C_{2}$) net-$\Lambda$ distributions, context both strangeness baryon number conservation, as function collision energy,...