A5039284015- 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
- Dark Matter and Cosmic Phenomena
- Nuclear physics research studies
- Stochastic processes and statistical mechanics
- Statistical Methods and Bayesian Inference
- Distributed and Parallel Computing Systems
- Cosmology and Gravitation Theories
- Pulsars and Gravitational Waves Research
- Parallel Computing and Optimization Techniques
- Computational Physics and Python Applications
- Pediatric Urology and Nephrology Studies
- Advanced Data Storage Technologies
- Radiation Detection and Scintillator Technologies
- Neutrino Physics Research
- Theoretical and Computational Physics
- Muon and positron interactions and applications
- Asian Industrial and Economic Development
- Appendicitis Diagnosis and Management
- Solar and Space Plasma Dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Spectroscopy Techniques in Biomedical and Chemical Research
University of Jammu
2016-2025
Indian Institute of Technology Indore
2023-2025
A. Alikhanyan National Laboratory
2015-2024
American University in Cairo
2023
Abilene Christian University
2019-2023
AGH University of Krakow
2014-2019
Argonne National Laboratory
2005-2017
Brookhaven National Laboratory
2017
University of California, Los Angeles
2017
University of Illinois Chicago
2016
We report high statistics measurements of inclusive charged hadron production in Au+Au and p+p collisions at sqrt[s(NN)]=200 GeV. A large, approximately constant suppression is observed central for 5<p(T)<12 GeV/c. The collision energy dependence the yields centrality p(T) provide stringent constraints on theoretical models suppression. Models incorporating initial-state gluon saturation or partonic loss dense matter are largely consistent with observations. observe no evidence...
We report measurements of single-particle inclusive spectra and two-particle azimuthal distributions charged hadrons at high transverse momentum (high p(T)) in minimum bias central d+Au collisions sqrt[s(NN)]=200 GeV. The yield is enhanced relative to binary-scaled p+p collisions, while the are very similar those observed collisions. These results demonstrate that strong suppression back-to-back correlations p(T) previously Au+Au due final-state interactions with dense medium generated such
We present STAR measurements of the azimuthal anisotropy parameter v(2) and binary-collision scaled centrality ratio R(CP) for kaons lambdas (Lambda+Lambda) at midrapidity in Au+Au collisions square root s(NN)=200 GeV. In combination, particle-type dependencies contradict expectations from partonic energy loss followed by standard fragmentation vacuum. establish p(T) approximately 5 GeV/c as value where dependent baryon enhancement ends. The K(0)(S) Lambda+Lambda values are consistent with...
We report the beam energy (sqrt[sNN]=7.7-200 GeV) and collision centrality dependence of mean (M), standard deviation (σ), skewness (S), kurtosis (κ) net-proton multiplicity distributions in Au+Au collisions. The measurements are carried out by STAR experiment at midrapidity (|y|<0.5) within transverse momentum range 0.4<pT<0.8 GeV/c first phase Beam Energy Scan program Relativistic Heavy Ion Collider. These important for understanding quantum chromodynamic diagram. products moments, Sσ κσ2,...
We report the first measurements of moments -- mean ($M$), variance ($\sigma^{2}$), skewness ($S$) and kurtosis ($\kappa$) net-charge multiplicity distributions at mid-rapidity in Au+Au collisions seven energies, ranging from $\sqrt {{s_{\rm NN}}}$= 7.7 to 200 GeV, as a part Beam Energy Scan program RHIC. The are related thermodynamic susceptibilities net-charge, sensitive proximity QCD critical point. compare products moments, $\sigma^{2}/M$, $S\sigma$ $\kappa\sigma^{2}$ with expectations...
Local parity-odd domains are theorized to form inside a quark-gluon plasma which has been produced in high-energy heavy-ion collisions. The local manifest themselves as charge separation along the magnetic field axis via chiral effect. experimental observation of previously reported for collisions at top RHIC energies. In this Letter, we present results beam-energy dependence correlations $\mathrm{Au}+\mathrm{Au}$ midrapidity center-of-mass energies 7.7, 11.5, 19.6, 27, 39, and 62.4 GeV from...
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...
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...
The strong force, as one of the four fundamental forces at work in universe, governs interactions quarks and gluons, binds together atomic nucleus. Notwithstanding decades progress since Yukawa first developed a description force between nucleons terms meson exchange, full understanding interaction remains major challenge modern science. One remaining difficulty arises from non-perturbative nature which leads to phenomenon quark confinement distance scales on order size proton. Here we show...
We present a systematic analysis of two-pion interferometry in $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=200\phantom{\rule{0.3em}{0ex}}\mathrm{GeV}$ using the STAR detector Relativistic Heavy Ion Collider. extract Hanbury-Brown and Twiss radii study their multiplicity, transverse momentum, azimuthal angle dependence. The Gaussianness correlation function is studied. Estimates geometrical dynamical structure freeze-out source are extracted by fits with blast-wave...
Measurements of the production forward high-energy ${\ensuremath{\pi}}^{0}$ mesons from transversely polarized proton collisions at $\sqrt{s}=200\text{ }\text{ }\mathrm{GeV}$ are reported. The cross section is generally consistent with next-to-leading order perturbative QCD calculations. analyzing power small ${x}_{F}$ below about 0.3, and becomes positive large higher ${x}_{F}$, similar to trend in data $\sqrt{s}\ensuremath{\le}20\text{ }\mathrm{GeV}$. qualitative agreement model...
Midrapidity open charm spectra from direct reconstruction of ${D}^{0}(\overline{{D}^{0}})\ensuremath{\rightarrow}{K}^{\ensuremath{\mp}}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ in $d+\mathrm{A}\mathrm{u}$ collisions and indirect electron-positron measurements via semileptonic decays $p+p$ at $\sqrt{{s}_{NN}}=200\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}$ are reported. The ${D}^{0}(\overline{{D}^{0}})$ spectrum covers a transverse momentum (${p}_{T}$) range $0.1<{p}_{T}<3\text{...
We report the STAR measurement of ϕ meson production in Au+Au and p+p collisions at sNN=200GeV. Using event mixing technique, spectra yields are obtained mid-rapidity for five centrality bins non-singly-diffractive collisions. It is found that transverse momentum distributions from better fitted with a single-exponential while spectrum described by double-exponential distribution. The measured nuclear modification factors indicate central suppressed relative to peripheral when scaled number...
The short-lived $K(892){}^{*}$ resonance provides an efficient tool to probe properties of the hot and dense medium produced in relativistic heavy-ion collisions. We report measurements ${K}^{*}$ $\sqrt{{s}_{\mathit{NN}}}=200\phantom{\rule{0.3em}{0ex}}\mathrm{GeV}$ Au+Au $p+p$ collisions reconstructed via its hadronic decay channels $K(892){}^{*0}\ensuremath{\rightarrow}K\ensuremath{\pi}$...
We report the first measurement of elliptic anisotropy (v_{2}) charm meson D^{0} at midrapidity (|y|<1) in Au+Au collisions sqrt[s_{NN}]=200 GeV. The was conducted by STAR experiment RHIC utilizing a new high-resolution silicon tracker. measured v_{2} 0%-80% centrality can be described viscous hydrodynamic calculation for transverse momentum (p_{T}) less than 4 GeV/c. as function kinetic energy (m_{T}-m_{0}, where m_{T}=sqrt[p_{T}^{2}+m_{0}^{2}]) is consistent with that light mesons 10%-40%...
We report new STAR measurements of mid-rapidity yields for the $\Lambda$, $\bar{\Lambda}$, $K^{0}_{S}$, $\Xi^{-}$, $\bar{\Xi}^{+}$, $\Omega^{-}$, $\bar{\Omega}^{+}$ particles in Cu+Cu collisions at \sNN{200}, and $K^{0}_{S}$ Au+Au \sNN{200}. show that a given number participating nucleons, production strange hadrons is higher than same center-of-mass energy. find aspects enhancement factors all can be described by parameterization based on fraction participants undergo multiple collisions.
Fluctuations of conserved quantities such as baryon number, charge, and strangeness are sensitive to the correlation length hot dense matter created in relativistic heavy-ion collisions can be used search for QCD critical point. We report first measurements moments net-kaon multiplicity distributions Au+Au at sNN=7.7, 11.5, 14.5, 19.6, 27, 39, 62.4, 200 GeV. The collision centrality energy dependence mean (M), variance (σ2), skewness (S), kurtosis (κ) well ratio σ2/M products Sσ κσ2...
We present measurements of π− and π+ elliptic flow, v2, at midrapidity in Au+Au collisions √sNN=200, 62.4, 39, 27, 19.6, 11.5, 7.7 GeV, as a function event-by-event charge asymmetry, Ach, based on data from the STAR experiment RHIC. find that (π+) flow linearly increases (decreases) with asymmetry for most centrality bins √sNN=27 GeV higher. At √sNN=200 slope difference v2 between Ach exhibits dependence, which is qualitatively similar to calculations incorporate chiral magnetic wave effect....
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...
We present ΛΛ correlation measurements in heavy-ion collisions for Au+Au at sqrt[s_{NN}]=200 GeV using the STAR experiment Relativistic Heavy-Ion Collider. The Lednický-Lyuboshitz analytical model has been used to fit data obtain a source size, scattering length and an effective range. Implications of measurement function interaction parameters dihyperon searches are discussed.
We present results of analyses two-pion interferometry in $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{\mathit{NN}}}=7.7$, 11.5, 19.6, 27, 39, 62.4, and 200 GeV measured the STAR detector as part BNL Relativistic Heavy Ion Collider Beam Energy Scan program. The extracted correlation lengths (Hanbury-Brown--Twiss radii) are studied a function beam energy, azimuthal angle relative to reaction plane, centrality, transverse mass (${m}_{T}$) particles. analysis allows extraction...
The STAR Collaboration reports the measurement of semi-inclusive distributions charged-particle jets recoiling from a high transverse momentum hadron trigger, in central and peripheral $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{\mathrm{NN}}}=200$ GeV. Charged are reconstructed with anti-${k}_{\mathrm{T}}$ algorithm for jet radii $R$ between 0.2 0.5 low infrared cutoff track constituents (${p}_{\mathrm{T}}>0.2 \mathrm{GeV}/\mathrm{c}$). A novel mixed-event technique is used to...
We report first measurements of ${e}^{+}{e}^{\ensuremath{-}}$ pair production in the mass region $0.4<{M}_{ee}<2.6\text{ }\text{ }\mathrm{GeV}/{c}^{2}$ at low transverse momentum (${p}_{T}<0.15\text{ }\mathrm{GeV}/c$) noncentral $\mathrm{Au}+\mathrm{Au}$ collisions $\sqrt{{s}_{NN}}=200\text{ }\mathrm{GeV}$ and $\mathrm{U}+\mathrm{U}$ $\sqrt{{s}_{NN}}=193\text{ }\mathrm{GeV}$. Significant enhancement factors, expressed as ratios data over known hadronic contributions, are observed 40%--80%...
We present the measurement of transverse single-spin asymmetry weak boson production in transversely polarized proton-proton collisions at $\sqrt{s} = 500~\text{GeV}$ by STAR experiment RHIC. The measured observable is sensitive to Sivers function, one momentum dependent parton distribution functions, which predicted have opposite sign from that observed deep inelastic lepton-proton scattering. These data provide first experimental investigation non-universality fundamental our understanding QCD.