T. J. Humanic
A5047513188- 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
- Nuclear physics research studies
- Statistical Methods and Bayesian Inference
- Stochastic processes and statistical mechanics
- Pulsars and Gravitational Waves Research
- Cosmology and Gravitation Theories
- Dark Matter and Cosmic Phenomena
- Superconducting Materials and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Black Holes and Theoretical Physics
- Atomic and Molecular Physics
- Computational Physics and Python Applications
- Markov Chains and Monte Carlo Methods
- Cold Atom Physics and Bose-Einstein Condensates
- Theoretical and Computational Physics
- Laser-induced spectroscopy and plasma
- Pediatric Urology and Nephrology Studies
- Solar and Space Plasma Dynamics
- Particle Accelerators and Free-Electron Lasers
- Urological Disorders and Treatments
- Appendicitis Diagnosis and Management
The Ohio State University
2016-2025
A. Alikhanyan National Laboratory
2015-2024
Huzhou University
2023
Abilene Christian University
2020-2023
Ball State University
2023
Frankfurt Institute for Advanced Studies
2023
American University in Cairo
2023
Argonne National Laboratory
2023
Indian Institute of Technology Patna
2023
Institute of Modern Physics
2023
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 $\sqrt{s_{NN}}$.
Collisions between prolate uranium nuclei are used to study how particle production and azimuthal anisotropies depend on initial geometry in heavy-ion collisions. We report the two- four-particle cumulants, $v_2\{2\}$ $v_2\{4\}$, for charged hadrons from U+U collisions at $\sqrt{s_{\rm NN}}$ = 193 GeV Au+Au 200 GeV. Nearly fully overlapping selected based amount of energy deposited by spectators STAR Zero Degree Calorimeters (ZDCs). Within this sample, observed dependence multiplicity...
Dihadron angular correlations in d+Au collisions at sNN=200GeV are reported as a function of the measured zero-degree calorimeter neutral energy and forward charged hadron multiplicity Au-beam direction. A finite correlated yield is observed large relative pseudorapidity (Δη) on near side (i.e. azimuth Δϕ∼0). This Δη appears to scale with dominant, primarily jet-related, away-side (Δϕ∼π) yield. The Fourier coefficients Δϕ correlation, Vn=〈cosnΔϕ〉, have strong dependence. In addition, it...
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...
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.
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 acceptance-corrected dielectron excess mass spectra, where the known hadronic sources have been subtracted from inclusive are reported for first time at mid-rapidity |yee|<1 in minimum-bias Au+Au collisions sNN=19.6 and 200 GeV. spectra consistently described by a model calculation with broadened ρ spectral function Mee<1.1GeV/c2. integrated yield sNN=19.6GeV 0.4<Mee<0.75GeV/c2, normalized to charged particle multiplicity mid-rapidity, has value similar that In+In sNN=17.3GeV. For...
First results of the ${m}_{T}$ dependence ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}$ and ${K}^{+}{K}^{+}$ correlations from $\mathrm{S}+\mathrm{Pb}$ collisions at 200 GeV $/c$ per nucleon measured by focusing spectrometer NA44 experiment CERN are presented. Multidimensional fits characterize pion kaon emission volume. The radius parameter decreases with increasing ${p}_{T}$. Furthermore, radii show a common $1/\sqrt{{m}_{T}}$ dependence. This behavior can be interpreted as result strong...
We report here the first observation of directed flow (v_{1}) hypernuclei _{Λ}^{3}H and _{Λ}^{4}H in mid-central Au+Au collisions at sqrt[s_{NN}]=3 GeV RHIC. These data are taken as part beam energy scan program carried out by STAR experiment. From 165×10^{6} events 5%-40% centrality, about 8400 5200 candidates reconstructed through two- three-body decay channels. observe that these exhibit significant flow. Comparing to light nuclei, it is found midrapidity v_{1} slopes follow baryon number...
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...
Data from the first physics run at Relativistic Heavy-Ion Collider Brookhaven National Laboratory, Au+Au collisions sqrt[s(NN)]=130 GeV, have been analyzed by STAR Collaboration using three-pion correlations with charged pions to study whether are emitted independently freeze-out. We made a high-statistics measurement of correlation function and calculated normalized three-particle correlator obtain quantitative degree chaoticity pion source. It is found that seems increase increasing...
Dihadron correlations are analyzed in sNN=200GeV d+Au collisions classified by forward charged particle multiplicity and zero-degree neutral energy the Au-beam direction. It is found that jetlike correlated yield increases with event multiplicity. After taking into account this dependence, non-jet contribution on away side minimal, leaving little room for a back-to-back ridge these collisions.
A search for the quantum chromodynamics (QCD) critical point was performed by STAR experiment at BNL Relativistic Heavy Ion Collider, using dynamical fluctuations of unlike particle pairs. ion collisions were studied over a large range collision energies with homogeneous acceptance and excellent identification, covering significant in QCD phase diagram where may be located. Dynamical $K\ensuremath{\pi}$, $p\ensuremath{\pi}$, $Kp$ as measured central 0--5% Au + from center-of-mass...
Balance functions have been measured in terms of relative pseudorapidity (Δη) for charged particle pairs at the BNL Relativistic Heavy Ion Collider from Au + collisions √sNN=7.7GeV to 200 GeV using STAR detector. These results are compared with balance CERN Large Hadron Pb √sNN=2.76TeV by ALICE Collaboration. The width function decreases as become more central and beam energy is increased. In contrast, widths calculated shuffled events show little dependence on centrality or larger than...
The chiral magnetic wave (CMW) has been theorized to propagate in the deconfined nuclear medium formed high-energy heavy-ion collisions, and cause a difference elliptic flow ($v_{2}$) between negatively positively charged hadrons. Experimental data consistent with CMW have reported by STAR Collaboration at Relativistic Heavy Ion Collider (RHIC), based on charge asymmetry dependence of pion $v_{2}$ from Au+Au collisions $\sqrt{s_{\rm NN}}$ = 27 200 GeV. In this comprehensive study, we present...