L. Greiner
A5114374238- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Nuclear physics research studies
- Nuclear reactor physics and engineering
- Nuclear Physics and Applications
- Dark Matter and Cosmic Phenomena
- CCD and CMOS Imaging Sensors
- Radiation Detection and Scintillator Technologies
- Atomic and Molecular Physics
- Astrophysics and Cosmic Phenomena
- Ion-surface interactions and analysis
- Particle Accelerators and Free-Electron Lasers
- X-ray Spectroscopy and Fluorescence Analysis
- Stochastic processes and statistical mechanics
- Markov Chains and Monte Carlo Methods
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Atomic and Subatomic Physics Research
- Planetary Science and Exploration
- Astro and Planetary Science
- Distributed and Parallel Computing Systems
- Superconducting Materials and Applications
- Cold Atom Physics and Bose-Einstein Condensates
Lawrence Berkeley National Laboratory
2015-2024
A. Alikhanyan National Laboratory
2017-2023
Istituto Nazionale di Fisica Nucleare, Sezione di Bologna
2017-2023
Aligarh Muslim University
2020-2023
University of Houston
2023
COMSATS University Islamabad
2022
Central China Normal University
2019-2020
Budker Institute of Nuclear Physics
2020
Center for Research and Advanced Studies of the National Polytechnic Institute
2020
Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear
2020
Rapidity-odd directed flow (v1) measurements for charged pions, protons, and antiprotons near midrapidity (y=0) are reported in sNN=7.7, 11.5, 19.6, 27, 39, 62.4, 200 GeV Au+Au collisions as recorded by the STAR detector at Relativistic Heavy Ion Collider. At intermediate impact parameters, proton net-proton slope parameter dv1/dy|y=0 shows a minimum between 11.5 19.6 GeV. In addition, changes sign twice 7.7 39 The results qualitatively resemble predictions of hydrodynamic model with...
We report the first measurement of charmed-hadron (D(0)) production via hadronic decay channel (D(0) → K(-) + π(+)) in Au+Au collisions at sqrt[s(NN)] = 200 GeV with STAR experiment. The charm cross section per nucleon-nucleon collision midrapidity scales number binary collisions, N(bin), from p+p to central collisions. D(0) meson yields Au are strongly suppressed compared those scaled by for transverse momenta p(T) > 3 GeV/c, demonstrating significant energy loss quarks hot and dense...
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...
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 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 report a new measurement of the midrapidity inclusive jet longitudinal double-spin asymmetry, A_{LL}, in polarized pp collisions at center-of-mass energy sqrt[s]=200 GeV. The STAR data place stringent constraints on parton distribution functions extracted next-to-leading order from global analyses deep-inelastic scattering (DIS), semi-inclusive DIS, and RHIC data. measured asymmetries provide evidence 3σ level for positive gluon polarization Bjorken-x region x>0.05.
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...
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...
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.
We report a new measurement of ${D}^{0}$-meson production at mid-rapidity $(|y|<1)$ in Au + collisions $\sqrt{{s}_{\mathrm{NN}}}=200\phantom{\rule{0.16em}{0ex}}\mathrm{GeV}$ utilizing the heavy flavor tracker, high resolution silicon detector STAR experiment. Invariant yields ${D}^{0}$ mesons with transverse momentum ${p}_{T}\ensuremath{\lesssim}9\phantom{\rule{0.16em}{0ex}}\mathrm{GeV}/c$ are reported various centrality bins (0--10%, 10--20%, 20--40%, 40--60%, and 60--80%). Blast-wave...
We report the first measurement of rapidity-odd directed flow ($v_{1}$) for $D^{0}$ and $\overline{D^{0}}$ mesons at mid-rapidity ($|y| < 0.8$) in Au+Au collisions $\sqrt{s_{\rm NN}}$ = 200\,GeV using STAR detector Relativistic Heavy Ion Collider. In 10--80\% collisions, slope $v_{1}$ rapidity dependence ($dv_{1}/dy$), averaged over mesons, is -0.080 $\pm$ 0.017 (stat.) 0.016 (syst.) transverse momentum $p_{\rm T}$ above 1.5~GeV/$c$. The absolute value $D^0$-meson $dv_1/dy$ about 25 times...
We report on measurements of dielectron $({e}^{+}{e}^{\ensuremath{-}})$ production in $\mathrm{Au}+\mathrm{Au}$ collisions at a center-of-mass energy 200 GeV per nucleon-nucleon pair using the STAR detector BNL Relativistic Heavy Ion Collider. Systematic yield as function transverse momentum $({p}_{\mathrm{T}})$ and collision centrality show an enhancement compared to cocktail simulation hadronic sources low invariant-mass region $({M}_{ee}<1\phantom{\rule{4pt}{0ex}}\text{GeV}/{c}^{2})$....
We report measurements of single- and double-spin asymmetries for W± Z/γ∗ boson production in longitudinally polarized p+p collisions at √s=510 GeV by the STAR experiment RHIC. The were measured as a function decay lepton pseudorapidity, which provides theoretically clean probe proton's quark distributions scale W mass. results are compared to theoretical predictions, constrained deep inelastic scattering measurements, show preference sizable, positive up antiquark polarization range...
The $\jpsi$ $\pt$ spectrum and nuclear modification factor ($\raa$) are reported for $\pt < 5 \ \gevc$ $|y|<1$ from 0\% to 60\% central Au+Au Cu+Cu collisions at $\snn = 200 \gev$ STAR. A significant suppression of $\pt$-integrated production is observed in events. data consistent with no suppression, although the precision limited by available statistics. $\raa$ exhibits a strong low transverse momentum gradually increases $\pt$. compared high-$\pt$ STAR results previously published BNL...
We present measurements of second-order azimuthal anisotropy $({v}_{2})$ at midrapidity $(|y|<1.0)$ for light nuclei $d,\phantom{\rule{0.16em}{0ex}}t,\phantom{\rule{0.16em}{0ex}}^{3}\mathrm{He}$ (for $\sqrt{{s}_{NN}}=200$, 62.4, 39, 27, 19.6, 11.5, and 7.7 GeV) antinuclei $\overline{d}$ ($\sqrt{{s}_{NN}}=200$, 19.6 $^{3}\overline{\mathrm{He}}$ ($\sqrt{{s}_{NN}}=200$ in the STAR (Solenoidal Tracker RHIC) experiment. The ${v}_{2}$ these produced heavy-ion collisions is compared with those $p$...
Elliptic flow (v_2) values for identified particles at midrapidity in Au + collisions measured by the STAR experiment Beam Energy Scan Relativistic Heavy Ion Collider sqrt{s_{NN}}= 7.7--62.4 GeV are presented three centrality classes. The dependence and data 14.5 new. Except lowest beam energies we observe a similar relative v_2 baryon-meson splitting all classes which is agreement within 15% with number-of-constituent quark scaling. larger most to antiparticles, already observed minimum...
We present high precision measurements of elliptic flow near midrapidity (|y|<1.0) for multistrange hadrons and ϕ meson as a function centrality transverse momentum in Au+Au collisions at center mass energy √[sNN]=200 GeV. observe that the dependence Ω v2 is similar to π p, respectively, which may indicate heavier strange quark flows strongly lighter up down quarks. This observation constitutes clear piece evidence development partonic collectivity heavy-ion top RHIC energy. Number...
We present results from a harmonic decomposition of two-particle azimuthal correlations measured with the STAR detector in Au+Au collisions for energies ranging $\sqrt{s_{NN}}=7.7$ GeV to 200 GeV. The third $v_3^2\{2\}=\langle \cos3(\phi_1-\phi_2)\rangle$, where $\phi_1-\phi_2$ is angular difference azimuth, studied as function pseudorapidity between particle pairs $\Delta\eta = \eta_1-\eta_2$. Non-zero {\vthree} directly related previously observed large-$\Delta\eta$ narrow-$\Delta\phi$...
Azimuthal angular correlations of charged hadrons with respect to the axis a reconstructed (trigger) jet in Au+Au and p+p collisions at √[s(NN)]=200 GeV STAR are presented. The trigger population is biased toward jets that have not interacted medium, allowing easier matching energies between while enhancing medium effects on recoil jet. associated hadron yield significantly suppressed high transverse momentum (pTassoc) enhanced low pTassoc 0%-20% central compared collisions, which indicative...
We present measurements of $\mathrm{\ensuremath{\Omega}}$ and $\ensuremath{\phi}$ production at midrapidity from Au+Au collisions nucleon-nucleon center-of-mass energies $\sqrt{{s}_{NN}}=7.7, 11.5, 19.6$, 27, 39 GeV by the STAR experiment BNL Relativistic Heavy Ion Collider (RHIC). Motivated coalescence formation mechanism for these strange hadrons, we study ratios $N({\mathrm{\ensuremath{\Omega}}}^{\ensuremath{-}}+{\overline{\mathrm{\ensuremath{\Omega}}}}^{+})/[2N(\ensuremath{\phi})]$....
Azimuthal correlations of charged hadrons with direct-photon ($γ_{dir}$) and neutral-pion ($π^{0}$) trigger particles are analyzed in central Au+Au minimum-bias $p+p$ collisions at $\sqrt{s_{_{NN}}} = 200$ GeV the STAR experiment. The charged-hadron per-trigger yields mid-rapidity from compared to quantify suppression collisions. away-side associated-particle per $γ_{dir}$ is independent transverse momentum particle ($p_{T}^{\mathrm{trig}}$), whereas smaller low associated...