A5035182045- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Nuclear reactor physics and engineering
- Nuclear physics research studies
- Stochastic processes and statistical mechanics
- Pediatric Urology and Nephrology Studies
- Statistical Methods and Bayesian Inference
- Crystallography and molecular interactions
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Dark Matter and Cosmic Phenomena
- Markov Chains and Monte Carlo Methods
- Optical properties and cooling technologies in crystalline materials
- Atmospheric and Environmental Gas Dynamics
- Scientific Computing and Data Management
- Theoretical and Computational Physics
- Simulation Techniques and Applications
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Advanced Data Storage Technologies
- Distributed and Parallel Computing Systems
- Cold Atom Physics and Bose-Einstein Condensates
- Gamma-ray bursts and supernovae
- Laser-induced spectroscopy and plasma
Columbia University
2012-2024
Stony Brook University
2015-2024
State University of New York
2024
Augustana University
2016-2024
Banaras Hindu University
2016-2024
Bhabha Atomic Research Centre
2018-2024
PHENIX laboratory
2016-2023
Abilene Christian University
2023
Charles University
2016-2023
Kurchatov Institute
2020-2023
Recently, multiparticle-correlation measurements of relativistic $p/d/^{3}\mathrm{He}+\mathrm{Au}$, $p+\mathrm{Pb}$, and even $p+p$ collisions show surprising collective signatures. Here, we present beam-energy-scan two-, four-, six-particle angular correlations in $d+\mathrm{Au}$ at $\sqrt{{s}_{NN}}=200$, 62.4, 39, 19.6 GeV. We also two- four-particle $p+\mathrm{Au}$ $\sqrt{{s}_{NN}}=200\text{ }\text{ }\mathrm{GeV}$. find the cumulant to be real valued for all four energies. that has...
We present the first measurements of long-range angular correlations and transverse momentum dependence elliptic flow $v_2$ in high-multiplicity $p$$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV. A comparison these results with previous $d$$+$Au $^3{\rm He}$$+$Au demonstrates a relation between initial collision eccentricity $\varepsilon_2$, suggesting that observed momentum-space azimuthal anisotropies small systems have collective origin reflect geometry. Good agreement is measured...
Asymmetric nuclear collisions of $p+\mathrm{Al}$, $p+\mathrm{Au}$, $d+\mathrm{Au}$, and $^{3}\mathrm{He}+\mathrm{Au}$ at $\sqrt{{s}_{NN}}=200\text{ }\text{ }\mathrm{GeV}$ provide an excellent laboratory for understanding particle production, as well exploring interactions among these particles after their initial creation in the collision. We present measurements charged hadron production $d{N}_{\text{ch}}/d\ensuremath{\eta}$ all such collision systems over a broad pseudorapidity range...
PHENIX reports differential cross sections of $\mu\mu$ pairs from semileptonic heavy-flavor decays and the Drell-Yan production mechanism measured in $p$$+$$p$ collisions at $\sqrt{s}=200$ GeV forward backward rapidity ($1.2<|\eta|<2.2$). The $c\bar{c}$, $b\bar{b}$, are separated using a template fit to unlike- like-sign muon pair spectra mass $p_T$. azimuthal opening angle correlation between muons $c\bar{c}$ $b\bar{b}$ pair-$p_T$ distributions compared generated {\sc pythia} powheg}...
The PHENIX Collaboration has measured the ratio of yields $\ensuremath{\psi}(2S)$ to $\ensuremath{\psi}(1S)$ mesons produced in $p+p$, $p+\mathrm{Al}$, $p+\mathrm{Au}$, and $^{3}\mathrm{He}+\mathrm{Au}$ collisions at $\sqrt{{s}_{{}_{\mathit{NN}}}}=200$ GeV over forward backward rapidity intervals $1.2<|y|<2.2$. We find that $p+p$ is consistent with measurements other collision energies. In nuclei, we ($p$-going or $^{3}\mathrm{He}$-going) direction, relative yield value collisions. However,...
We present measurements of the transverse-momentum dependence elliptic flow ${v}_{2}$ for identified pions and (anti)protons at midrapidity ($|\ensuremath{\eta}|<0.35$), in 0%--5% central $p+\mathrm{Au}$ $^{3}\mathrm{He}+\mathrm{Au}$ collisions $\sqrt{{s}_{{}_{NN}}}=200$ GeV. When taken together with previously published $d+\mathrm{Au}$ GeV, results cover a broad range small-collision-system multiplicities intrinsic initial geometries. observe clear mass-dependent splitting...
In relativistic heavy-ion collisions, the analysis of charmonium yields normalized to those in $p\phantom{\rule{0}{0ex}}p$ collisions has been shown reveal final-state interactions occurring hot and dense strongly interacting matter created such events. However, until recently, similar analyses measured smaller collision systems---$p\phantom{\rule{0}{0ex}}A$ versus $p\phantom{\rule{0}{0ex}}p$---were performed terms cold nuclear effects. The measurements reported by PHENIX Collaboration...
The measurement of the direct-photon spectrum from $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{{}_{NN}}}=200$ GeV is presented by PHENIX Collaboration using external-photon-conversion technique for 0%--93% central in a transverse-momentum (${p}_{T}$) range 0.8--10 $\text{GeV}/c$. An excess direct photons, above prompt-photon production hard-scattering processes, observed ${p}_{T}<6\phantom{\rule{4pt}{0ex}}\text{GeV}/c$. Nonprompt photons are measured subtracting prompt component,...
Charmonium is a valuable probe in heavy-ion collisions to study the properties of quark gluon plasma, and also an interesting small collision systems cold nuclear matter effects, which are present large systems. With recent observations collective behavior produced particles system collisions, measurements modification charmonium have become increasingly relevant. We results $J/\psi$ at forward backward rapidity various systems, $p$$+$$p$, $p$$+$Al, $p$$+$Au $^3$He$+$Au,...
The PHENIX experiment has studied nuclear effects in $p$$+$Al and $p$$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV on charged hadron production forward rapidity ($1.4<\eta<2.4$, $p$-going direction) backward ($-2.2<\eta<-1.2$, $A$-going direction). Such are quantified by measuring modification factors as a function of transverse momentum pseudorapidity various collision multiplicity selections. In central collisions, suppression (enhancement) is observed (backward) compared to the binary...
We report the transverse single-spin asymmetries of $J/\ensuremath{\psi}$ production at forward and backward rapidity, $1.2<|y|<2.2$, as a function momentum (${p}_{T}$) Feynman-$x$ (${x}_{F}$). The data analyzed were recorded by PHENIX experiment Relativistic Heavy Ion Collider in 2015 from $p+p$, $p+\mathrm{Al}$, $p+\mathrm{Au}$ collisions with transversely polarized proton beams $\sqrt{{s}_{NN}}=200\text{ }\text{ }\mathrm{GeV}$. At this collision energy, for heavy-flavor particle $p+p$...
The PHENIX experiment at the Relativistic Heavy Ion Collider has measured longitudinal double spin asymmetries, $A_{LL}$, for charged pions midrapidity ($|η|<0.35$) in longitudinally polarized $p$$+$$p$ collisions $\sqrt{s}=510$ GeV. These measurements are sensitive to gluon contribution total of proton parton momentum fraction $x$ range between 0.04 and 0.09. One can infer sign polarization from ordering pion asymmetries with charge alone. found be consistent global...
We present a measurement of the transverse single-spin asymmetry for $\pi^0$ and $\eta$ mesons in $p^\uparrow$$+$$p$ collisions pseudorapidity range $|\eta|<0.35$ at center-of-mass energy 200 GeV with PHENIX detector Relativistic Heavy Ion Collider. In comparison previous measurements this kinematic region, these results have factor 3 smaller uncertainties. As hadrons, are sensitive to both initial- final-state nonperturbative effects mix parton flavors. Comparisons differences their...
Studying spin-momentum correlations in hadronic collisions offers a glimpse into three-dimensional picture of proton structure. The transverse single-spin asymmetry for midrapidity isolated direct photons $p^\uparrow+p$ at $\sqrt{s}=200$ GeV is measured with the PHENIX detector Relativistic Heavy Ion Collider (RHIC). Because particular are produced from hard scattering and do not interact via strong force, this measurement clean probe initial-state inside sensitive to gluon interference...
We report on the nuclear dependence of transverse single-spin asymmetries (TSSAs) in production positively charged hadrons polarized p^{↑}+p, p^{↑}+Al, and p^{↑}+Au collisions at sqrt[s_{NN}]=200 GeV. The measurements have been performed forward rapidity (1.4<η<2.4) over range momentum (1.8<p_{T}<7.0 GeV/c) Feynman x (0.1<x_{F}<0.2). observed positive for p^{↑}+p collisions, significantly reduced p^{↑}+A collisions. These results reveal a TSSAs charged-hadron regime where perturbative...
We present measurements of elliptic and triangular azimuthal anisotropy charged particles detected at forward rapidity $1<|\ensuremath{\eta}|<3$ in Au + collisions $\sqrt{{s}_{{}_{NN}}}=200$ GeV, as a function centrality. The multiparticle cumulant technique is used to obtain the flow coefficients ${v}_{2}{2},{v}_{2}{4},{v}_{2}{6}$, ${v}_{2}{8}$, ${v}_{3}{2}$ ${v}_{3}{4}$. Using small-variance limit, we estimate mean variance event-by-event ${v}_{2}$ distribution from ${v}_{2}{2}$...
The invariant yield of electrons from open-heavy-flavor decays for 1<pT<8 GeV/c at midrapidity |y|<0.35 in Au+Au collisions √sNN = 200 GeV has been measured by the PHENIX experiment BNL Relativistic Heavy Ion Collider. A displaced-vertex analysis with silicon-vertex detector enables extraction fraction charm and bottom hadron unfolding parent hadrons. nuclear-modification factors RAA heavy-flavor hadrons show both a centrality quark-mass dependence, indicating suppression quark-gluon plasma...
Reconstructed jets in heavy ion collisions are a crucial tool for understanding the quark-gluon plasma. The separation of from underlying event is necessary particularly central reactions order to quantify medium modifications parton shower and response surrounding itself. There have been many methods proposed implemented studying substructure proton-proton collisions. In this paper, we detail method contributions Au+Au at $\sqrt{{s}_{NN}}=200$ GeV utilizing HIJING generator. This method,...
Polarized proton-proton collisions provide leading-order access to gluons, presenting an opportunity constrain gluon spin-momentum correlations within transversely polarized protons and enhance our understanding of the three-dimensional structure proton. Midrapidity open-heavy-flavor production at $\sqrt{s}=200\text{ }\text{ }\mathrm{GeV}$ is dominated by gluon-gluon fusion, providing heightened sensitivity dynamics relative other channels. Transverse single-spin asymmetries positrons...
During 2015, the Relativistic Heavy Ion Collider (RHIC) provided collisions of transversely polarized protons with Au and Al nuclei for first time, enabling exploration transverse-single-spin asymmetries heavy nuclei. Large single-spin in very forward neutron production have been previously observed $p+p$ at RHIC, existing theoretical framework that was successful describing asymmetry predicts only a moderate atomic-mass-number ($A$) dependence. In contrast, RHIC $p+A$ showed surprisingly...
We report the double-helicity asymmetry, ${A}_{LL}^{J/\ensuremath{\psi}}$, in inclusive $J/\ensuremath{\psi}$ production at forward rapidity as a function of transverse momentum ${p}_{T}$ and $|y|$. The data analyzed were taken during $\sqrt{s}=510\text{ }\text{ }\mathrm{GeV}$ longitudinally polarized $p+p$ collisions Relativistic Heavy Ion Collider 2013 run using PHENIX detector. At this collision energy, particles are predominantly produced through gluon-gluon scatterings, thus...
Reported here are transverse single-spin asymmetries (AN) in the production of charged hadrons as a function momentum (pT) and Feynman-x (xF) polarized p↑+p, p↑+Al, p↑+Au collisions at √sNN=200 GeV. The measurements have been performed forward backward rapidity (1.4<|η|<2.4) over range 1.5 GeV/c<pT<7.0 GeV/c 0.04<|xF|<0.2. A nonzero asymmetry is observed for positively (xF>0) p↑+p collisions, whereas p↑+Al results show smaller asymmetries. This finding provides new opportunities to...