A. Al-Jamel
A5087965121- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Quantum Mechanics and Non-Hermitian Physics
- Fractional Differential Equations Solutions
- Nuclear reactor physics and engineering
- Nonlinear Waves and Solitons
- Quantum chaos and dynamical systems
- Mathematical functions and polynomials
- Cold Atom Physics and Bose-Einstein Condensates
- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Quantum, superfluid, helium dynamics
- Thermoelastic and Magnetoelastic Phenomena
- Magnetic Properties and Synthesis of Ferrites
- Dark Matter and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Multiferroics and related materials
- Quantum and electron transport phenomena
- Laser-Matter Interactions and Applications
- Particle Detector Development and Performance
- Nuclear physics research studies
- Advanced Differential Equations and Dynamical Systems
- Dye analysis and toxicity
- Relativity and Gravitational Theory
Al al-Bayt University
2014-2024
New Mexico State University
2008-2019
University of Jordan
2018
University of Nizwa
2016-2017
Banaras Hindu University
2014
China Institute of Atomic Energy
2014
PHENIX laboratory
2014
Augustana University
2014
Abilene Christian University
2014
The PHENIX experiment at the BNL Relativistic Heavy Ion Collider (RHIC) has measured electrons with $0.3<{p}_{T}<9\text{ }\text{ }\mathrm{GeV}/c$ midrapidity ($|y|<0.35$) from heavy-flavor (charm and bottom) decays in $\mathrm{Au}+\mathrm{Au}$ collisions $\sqrt{{s}_{\mathrm{NN}}}=200\text{ }\mathrm{GeV}$. nuclear modification factor ${R}_{\mathrm{AA}}$ relative to $p+p$ shows a strong suppression central collisions, indicating substantial energy loss of heavy quarks medium produced RHIC...
Transverse momentum spectra of charged hadrons with p(T)<8 GeV/c and neutral pions p(T)<10 have been measured at midrapidity by the PHENIX experiment BNL RHIC in d+Au collisions sqrt[s(NN)]=200 GeV. The yields are compared to those p+p same sqrt[s(NN)] scaled up number underlying nucleon-nucleon d+Au. yield ratio does not show suppression observed central Au+Au RHIC. Instead, there is a small enhancement high particles.
The production of low mass e+e- pairs for m_{e+e-} < 300 MeV/c^2 and 1 p_T <5 GeV/c is measured in p+p Au+Au collisions at sqrt(s_NN)=200 GeV. Enhanced yield above hadronic sources observed. Treating the excess as internal conversions, invariant direct photons deduced. In central collisions, photon over exponential transverse momentum, with inverse slope T = 221 +/- 19 (stat) (syst) MeV. Hydrodynamical models initial temperatures ranging from 300--600 MeV times ~ 0.6 - 0.15 fm/c after...
The PHENIX experiment at the BNL Relativistic Heavy Ion Collider (RHIC)has measured $J/\ensuremath{\psi}$ production for rapidities $\ensuremath{-}2.2<y<2.2$ in $\mathrm{Au}+\mathrm{Au}$ collisions $\sqrt{{s}_{NN}}=200\text{ }\text{ }\mathrm{GeV}$. invariant yield and nuclear modification factor ${R}_{AA}$ as a function of centrality,transverse momentum, rapidity are reported. A suppression relative to binary collision scaling proton-protonreaction yields is observed. Models which describe...
Differential measurements of elliptic flow (${v}_{2}$) for $\mathrm{Au}+\mathrm{Au}$ and $\mathrm{Cu}+\mathrm{Cu}$ collisions at $\sqrt{{s}_{\mathrm{NN}}}=200\text{ }\text{ }\mathrm{GeV}$ are used to test validate predictions from perfect fluid hydrodynamics scaling ${v}_{2}$ with eccentricity, system size, transverse kinetic energy (${\mathrm{KE}}_{T}$). For ${\mathrm{KE}}_{T}\ensuremath{\equiv}{m}_{T}\ensuremath{-}m$ up $\ensuremath{\sim}1\text{ the is compatible hydrodynamic expansion a...
Azimuthal angle ($\ensuremath{\Delta}\ensuremath{\phi}$) correlations are presented for a broad range of transverse momentum ($0.4<{p}_{T}<10$ GeV/$c$) and centrality (0--92%) selections charged hadrons from dijets in Au+Au collisions at $\sqrt{{s}_{\mathit{NN}}}=200$ GeV. With increasing ${p}_{T}$, the away-side $\ensuremath{\Delta}\ensuremath{\phi}$ distribution evolves relatively flat shape to concave shape, then convex shape. Comparisons with $p+p$ data suggest that can be divided into...
For Au + collisions at 200 GeV, we measure neutral pion production with good statistics for transverse momentum, pT, up to 20 GeV/c. A fivefold suppression is found, which essentially constant 5 < pT Experimental uncertainties are small enough constrain any model-dependent parametrization the transport coefficient of medium, e.g., q in parton quenching model. The spectral shape similar all collision classes, and does not saturate collisions.
PHENIX has measured the e^+e^- pair continuum in sqrt(s_NN)=200 GeV Au+Au and p+p collisions over a wide range of mass transverse momenta. The yield is compared to expectations from hadronic sources, based on measurements. In intermediate region, between masses phi J/psi meson, consistent with correlated c^bar-c production, though other mechanisms are not ruled out. low region (below phi) inclusive spectrum well described by known contributions light meson decays. contrast, minimum bias this...
Transverse momentum spectra of electrons (${p}_{T}^{e}$) from semileptonic weak decays heavy-flavor mesons in the range $0.3<{p}_{T}^{e}<9.0$ GeV/$c$ have been measured at midrapidity ($|y|<0.35$) by PHENIX experiment Relativistic Heavy Ion Collider $p+p$ and $\mathrm{Au}+\mathrm{Au}$ collisions $\sqrt{{s}_{\mathrm{NN}}}=200$ GeV. In addition, azimuthal anisotropy parameter ${v}_{2}$ has for $0.3<{p}_{T}^{e}<5.0$ collisions. The substantial modification ${p}_{T}^{e}$ compared with as well...
The dependence of transverse momentum spectra neutral pions and $\ensuremath{\eta}$ mesons with ${p}_{T}<16\text{ }\text{ }\mathrm{GeV}/c$ ${p}_{T}<12\text{ }\mathrm{GeV}/c$, respectively, on the centrality collision has been measured at midrapidity by PHENIX experiment BNL Relativistic Heavy Ion Collider (RHIC) in $d+\mathrm{Au}$ collisions $\sqrt{{s}_{NN}}=200\text{ }\mathrm{GeV}$. yields are compared to those $p+p$ same $\sqrt{{s}_{NN}}$ scaled number underlying nucleon-nucleon...
Measurements of midrapidity charged-particle multiplicity distributions, $d{N}_{\mathrm{ch}}/d\ensuremath{\eta}$, and transverse-energy $d{E}_{T}/d\ensuremath{\eta}$, are presented for a variety collision systems energies. Included distributions $\mathrm{Au}\phantom{\rule{0.16em}{0ex}}+\phantom{\rule{0.16em}{0ex}}\mathrm{Au}$ collisions at $\sqrt{{s}_{{}_{NN}}}=200$, 130, 62.4, 39, 27, 19.6, 14.5, 7.7 GeV, $\mathrm{Cu}\phantom{\rule{0.16em}{0ex}}+\phantom{\rule{0.16em}{0ex}}\mathrm{Cu}$...
Cross sections for midrapidity production of direct photons in p+p collisions at the Relativistic Heavy Ion Collider (RHIC) are reported transverse momenta 3 < pT 16 GeV/c. Next-to-leading order perturbative QCD (pQCD) describes data well >5 GeV/c, where uncertainties measurement and theory comparable. We also report on effect requiring to be isolated from parton jet energy. The observed fraction is described by pQCD >7
$J/\ensuremath{\psi}$ production in $d+\mathrm{Au}$ and $p+p$ collisions at $\sqrt{{s}_{NN}}=200\text{ }\text{ }\mathrm{GeV}$ has been measured by the PHENIX experiment rapidities $\ensuremath{-}2.2<y<+2.4$. The cross sections nuclear dependence of versus rapidity, transverse momentum, centrality are obtained compared to lower energy $p+A$ results theoretical models. observed is found be modest, suggesting that absorption final state weak shadowing gluon distributions small consistent with...
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...
The PHENIX experiment has measured the suppression of semi-inclusive single high-transverse-momentum ${\ensuremath{\pi}}^{0}$'s in Au+Au collisions at $\sqrt{{s}_{\mathit{NN}}}=200$ GeV. present understanding this is terms energy loss parent (fragmenting) parton a dense color-charge medium. We have performed quantitative comparison between various energy-loss models and our experimental data. statistical point-to-point uncorrelated as well correlated systematic uncertainties are taken into...
We present a new analysis of $J/\ensuremath{\psi}$ production yields in deuteron-gold collisions at $\sqrt{{s}_{\mathit{NN}}}=200$ GeV using data taken from the PHENIX experiment 2003 and previously published S. Adler et al. [Phys. Rev. Lett 96, 012304 (2006)]. The high statistics proton-proton 2005 are used to improve baseline measurement thus construct updated cold nuclear matter modification factors (${R}_{d\mathrm{Au}}$). A suppression is observed as one goes forward rapidity (in...
The PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC) has performed systematic measurements of phi meson production in K+K- decay channel midrapidity p+p, d+Au, Cu+Cu and Au+Au collisions sqrt(S_NN)=200 GeV. Results are presented on invariant yield nuclear modification factor R_AA for Cu+Cu, R_dA d+Au collisions, studied as a function transverse momentum (1<p_T<7 GeV/c) centrality. In central mid-central exhibits suppression relative to expectations from binary scaled p+p...
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)...
Measurements of the midrapidity transverse energy distribution, $d\Et/d\eta$, are presented for $p$$+$$p$, $d$$+$Au, and Au$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV additionally $\sqrt{s_{_{NN}}}=62.4$ 130 GeV. The $d\Et/d\eta$ distributions first compared with number nucleon participants $N_{\rm part}$, binary coll}$, constituent-quark $N_{qp}$ calculated from a Glauber model based on nuclear geometry. For Au$+$Au, $\mean{d\Et/d\eta}/N_{\rm part}$ increases while...
We present new anisotropic models for Buchdahl [H. A. Buchdahl, Phys. Rev. 116 (1959) 1027.] type perfect fluid solution. For this purpose, we started with metric potential [Formula: see text] same as and is monotonically increasing function suggested by Lake [K. Lake, D 67 (2003) 104015]. After that determine the pressure anisotropy factor help of both potentials propose well behaved general solution distribution. The physical quantities like energy density, radial tangential pressures,...
PHENIX has measured the centrality dependence of midrapidity pion, kaon, and proton transverse momentum distributions in d+Au p+p collisions at √sNN=200 GeV. The data provide a reference for nuclear effects previously Au+Au collisions. Hadron production is enhanced d+Au, relative to independent nucleon-nucleon scattering, as was observed lower energy modification factor (anti)protons larger than that pions. difference increases with but not sufficient account abundance baryon central BNL...