A5101405448- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Nuclear reactor physics and engineering
- Radiation Detection and Scintillator Technologies
- Dark Matter and Cosmic Phenomena
- Nuclear physics research studies
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Statistical Methods and Bayesian Inference
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Stochastic processes and statistical mechanics
- Pulsars and Gravitational Waves Research
- Pediatric Urology and Nephrology Studies
- Plasma Diagnostics and Applications
- Nuclear Physics and Applications
- Synthesis and Properties of Aromatic Compounds
- Radiation Effects in Electronics
- Muon and positron interactions and applications
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Astrophysics and Cosmic Phenomena
- CCD and CMOS Imaging Sensors
The University of Tokyo
2016-2025
A. Alikhanyan National Laboratory
2015-2024
Tokyo University of Science
2015-2024
GSI Helmholtz Centre for Heavy Ion Research
2017-2024
Banaras Hindu University
2018-2023
Abilene Christian University
2018-2023
PHENIX laboratory
2022-2023
Augustana University
2018-2023
Charles University
2018-2023
Bhabha Atomic Research Centre
2022-2023
PHENIX presents a simultaneous measurement of the production direct γ and π0 in d+Au collisions at sNN=200 GeV over pT range 7.5 to 18 GeV/c for different event samples selected by activity, i.e., charged-particle multiplicity detected forward rapidity. Direct-photon yields are used empirically estimate contribution hard-scattering processes samples. Using this estimate, average nuclear-modification factor, RdAu,EXPπ0, is 0.925±0.023(stat)±0.15(scale), consistent with unity minimum-bias (MB)...
The future opportunities for high-density QCD studies with ion and proton beams at the LHC are presented. Four major scientific goals identified: characterisation of macroscopic long wavelength Quark-Gluon Plasma (QGP) properties unprecedented precision, investigation microscopic parton dynamics underlying QGP properties, development a unified picture particle production from small (pp) to large (nucleus--nucleus) systems, exploration densities in nuclei broad ($x$, $Q^2$) kinematic range...
Differential elliptic flow (${v}_{2}$) for $\ensuremath{\phi}$ mesons and (anti)deuterons $(\overline{d})d$ is measured $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=200\text{ }\text{ }\mathrm{GeV}$. The ${v}_{2}$ follows the trend of lighter ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ ${K}^{\ifmmode\pm\else\textpm\fi{}}$ mesons, suggesting that ordinary hadrons interacting with standard hadronic cross sections are not primary driver development. values suggest additive...
We present the first measurement of photoproduction J/ψ and two-photon production high-mass e+e− pairs in electromagnetic (or ultra-peripheral) nucleus–nucleus interactions, using Au + data at sNN=200 GeV. The events are tagged with forward neutrons emitted following Coulomb excitation one or both Au⋆ nuclei. event sample consists 28 me+e−>2 GeV/c2 zero like-sign background. measured cross sections midrapidity dσ/dy(J/ψ+Xn,y=0)=76±33(stat)±11(syst) μb...
We report the measurement of direct photons at midrapidity in $\mathrm{Au}+\mathrm{Au}$ collisions $\sqrt{{s}_{NN}}=200\text{ }\text{ }\mathrm{GeV}$. The photon signal was extracted for transverse momentum range $4\text{ }\mathrm{GeV}/\phantom{\rule{0ex}{0ex}}c<{p}_{T}<22\text{ }\mathrm{GeV}/c$, using a statistical method to subtract decay from inclusive sample. nuclear modification factor ${R}_{\mathrm{AA}}$ calculated as function ${p}_{T}$ different collision centralities measured $p+p$...
We present inclusive charged hadron elliptic flow (${v}_{2}$) measured over the pseudorapidity range $|\ensuremath{\eta}|<0.35$ in $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{\mathit{NN}}}=200$ GeV. Results for ${v}_{2}$ are presented a broad of transverse momentum $({p}_{T}=0.2\text{\ensuremath{-}}8.0$ GeV/$c$) and centrality (0--60%). To study nonflow effects that correlations other than collective flow, as well fluctuations ${v}_{2}$, we compare two different analysis methods: (1)...
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...
Opportunities for searches phenomena beyond the Standard Model (BSM) using heavy-ions beams at high energies are outlined. Different BSM proposed in last years collisions of heavy ions, mostly Large Hadron Collider, summarized. A few concrete selected cases reviewed including axion-like particles, anomalous $\tau$ electromagnetic moments, magnetic monopoles, and dark photons. Expectations achievable sensitivities these coming given. Studies CP violation hot dense QCD matter connections to...
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}...
Measurements of the azimuthal anisotropy high-${p}_{T}$ neutral pion (${\ensuremath{\pi}}^{0}$) production in $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{{}_{\mathit{NN}}}}=200$ GeV by PHENIX experiment are presented. The data included this article were collected during 2004 Relativistic Heavy Ion Collider running period and represent approximately an order magnitude increase number analyzed events relative to previously published results. Azimuthal angle distributions...
We present measurements of the elliptic flow (v2) as a function transverse momentum (pT), pseudorapidity (η), and centrality in d+Au collisions at sNN=200, 62.4, 39, 19.6 GeV. The beam-energy scan provides testing ground for onset signatures small collision systems. measure nonzero v2 signal all four energies, which, midrapidity low pT, is consistent with predictions from viscous hydrodynamic models. Comparisons calculations parton transport models (based on ampt Monte Carlo generator) show...
The ALICE (A Large Ion Collider Experiment at CERN) collaboration plans an upgrade of the detector during second long shutdown LHC, which interaction rate will be increased to 50 kHz for Pb-Pb collisions. This demands operation Time Projection Chamber (TPC) in ungated continuous mode. A gating grid can not used prevent ions drifting back into drift volume. Gas Electron Multipliers (GEM) offer intrinsic suppression ion backflow. To keep distortions due space-charge a manageable level yield 10...
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,...
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,...
Abstract With the next upgrade of ALICE inner tracking system (ITS3) as its primary focus, a set small MAPS test structures have been developed in 65 nm TPSCo CMOS process. The CE-65 focuses on characterisation analogue charge collection properties this technology. latest iteration, CE-65v2, was produced different processes (Standard, with low-dose n-type blanket, and blanket gap between pixels), pixel pitches (15, 18, 22.5 µm) arrangements (square or staggered). comparatively large array...
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...
There is strong evidence for the formation of small droplets quark-gluon plasma in $p/d/^{3}\mathrm{He}+\mathrm{Au}$ collisions at Relativistic Heavy Ion Collider (RHIC) and $p+p/\mathrm{Pb}$ Large Hadron Collider. In particular, analysis data RHIC different geometries obtained by varying projectile size shape has proved insightful. present analysis, we find excellent agreement with previously published PHENIX results on elliptical triangular flow an independent via two-particle correlation...
A three-dimensional correlation function obtained from midrapidity, low p(T), pion pairs in central Au+Au collisions at sqrt[s(NN)]=200 GeV is studied. The extracted model-independent source indicates a long range tail the directions of pair transverse momentum (out) and beam (long). proper breakup time tau(0) ~ 9 fm/c mean emission duration Delta tau 2 fm/c, leading to sizable differences ({|Delta t(LCM)|} approximately 12 fm/c), are required allow models be successfully matched these...
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...