J. E. Gonzalez
A5102027642- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Nuclear reactor physics and engineering
- Quantum and electron transport phenomena
- Astronomy and Astrophysical Research
- Semiconductor Quantum Structures and Devices
- Markov Chains and Monte Carlo Methods
- Galaxies: Formation, Evolution, Phenomena
- Astro and Planetary Science
- Pediatric Urology and Nephrology Studies
- Appendicitis Diagnosis and Management
- Physics of Superconductivity and Magnetism
- RNA and protein synthesis mechanisms
- Astronomical and nuclear sciences
- Urological Disorders and Treatments
- Scientific Research and Discoveries
- Spectroscopy and Quantum Chemical Studies
- Spectroscopy and Laser Applications
- Adaptive optics and wavefront sensing
- RNA modifications and cancer
- Stochastic processes and statistical mechanics
- Stellar, planetary, and galactic studies
- RNA Research and Splicing
- Surface and Thin Film Phenomena
Universidad Pontificia Bolivariana
2018-2023
Stockholm University
2015
AlbaNova
2015
University of Magdalena
2015
Industrial University of Santander
2014
Durham University
2008
University of California, Los Angeles
1990-2007
Universidad Nacional Autónoma de México
2007
California Institute of Technology
2004-2006
Carnegie Mellon University
2004-2006
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
The results from the STAR Collaboration on directed flow (${v}_{1}$), elliptic (${v}_{2}$), and fourth harmonic (${v}_{4}$) in anisotropic azimuthal distribution of particles Au+Au collisions at $\sqrt{{s}_{\mathit{NN}}}=200\phantom{\rule{0.3em}{0ex}}\mathrm{GeV}$ are summarized compared with other experiments theoretical models. Results for identified presented fit a blast-wave model. Different analysis methods nonflow effects extracted data. For ${v}_{2}$, scaling number constituent quarks...
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...
Charged hadrons in [EQUATION: SEE TEXT] associated with particles of are reconstructed pp and Au+Au collisions at sqrt[sNN]=200 GeV. The multiplicity p magnitude sum found to increase from central collisions. distributions, while similar shape on the nearside, significantly softened awayside relative not much harder than that inclusive hadrons. results, consistent jet quenching, suggest fragments approach equilibration medium traversed.
Transverse mass and rapidity distributions for charged pions, kaons, protons, antiprotons are reported square root of [sNN]=200 GeV pp Au+Au collisions at Relativistic Heary Ion Collider (RHIC). Chemical kinetic equilibrium model fits to our data reveal strong radial flow long duration from chemical freeze-out in central collisions. The temperature appears be independent initial conditions RHIC energies.
We present strange particle spectra and yields measured at midrapidity in $\sqrt{s}=200$ GeV proton-proton ($p+p$) collisions the BNL Relativistic Heavy Ion Collider (RHIC). find that previously observed universal transverse mass (${m}_{T}\ensuremath{\equiv}\sqrt{{{p}_{T}}^{2}+{m}^{2}}$) scaling of hadron production $p+p$ seems to break down higher ${m}_{T}$ there is a difference shape spectrum between baryons mesons. observe antibaryon baryon ratios near unity for \ensuremath{\Lambda}...
Transverse momentum spectra of pi+/-, p, and p up to 12 GeV/c at midrapidity in centrality selected Au + collisions square root sNN=200 GeV are presented. In central collisions, both pi +/- p(p) show significant suppression with respect binary scaling pT approximately >4 GeV/c. Protons antiprotons less suppressed than the range 1.5 < 6 The pi-/pi+ p/p ratios most a weak dependence no dependence. p/pi approach values d >5 results high indicate that partonic sources have similar energy loss...
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...
The STAR Collaboration at the Relativistic Heavy Ion Collider reports measurements of azimuthal correlations high transverse momentum (pT) charged hadrons in Au+Au collisions higher pT than reported previously. As is increased, a narrow, back-to-back peak emerges above decreasing background, providing clear dijet signal for all collision centralities studied. Using these correlations, we perform systematic study production and suppression nuclear collisions, new constraints on mechanisms...
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{...
Measurements of two-particle correlations on angular difference variables ${\ensuremath{\eta}}_{1}\ensuremath{-}{\ensuremath{\eta}}_{2}$ (pseudorapidity) and ${\ensuremath{\phi}}_{1}\ensuremath{-}{\ensuremath{\phi}}_{2}$ (azimuth) are presented for all primary charged hadrons with transverse momentum $0.15\ensuremath{\le}{p}_{t}\ensuremath{\le}2$ GeV/$c$ $|\ensuremath{\eta}|\ensuremath{\le}1.3$ from Au-Au collisions at $\sqrt{{s}_{\mathit{NN}}}=130$ GeV. Large-amplitude observed over a broad...
We report the first observations of harmonic (directed flow, ${v}_{1}$) and fourth (${v}_{4}$), in azimuthal distribution particles with respect to reaction plane $\mathrm{A}\mathrm{u}+\mathrm{A}\mathrm{u}$ collisions at BNL Relativistic Heavy Ion Collider (RHIC). Both measurements were done taking advantage large elliptic flow (${v}_{2}$) generated RHIC. From correlation ${v}_{2}$ ${v}_{1}$ it is determined that positive, or in-plane. The integrated ${v}_{4}$ about a factor 10 smaller than...
We present the scaling properties of Lambda, Xi, and Omega in midrapidity Au+Au collisions at Brookhaven National Laboratory Relativistic Heavy Ion Collider sqrt[s_{NN}]=200 GeV. The yield multistrange baryons per participant nucleon increases from peripheral to central more rapidly than that indicating an increase strange-quark density matter produced. strange phase-space occupancy factor gamma_{s} approaches unity for most collisions. Moreover, nuclear modification factors p, Xi are...
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 $K(892){}^{*0}\ensuremath{\rightarrow}K\ensuremath{\pi}$...
The transverse mass spectra and midrapidity yields for Xis Omegas are presented. For the 10% most central collisions, (-)Xi(+)/h(-) ratio increases from Super Proton Synchrotron to Relativistic Heavy Ion Collider energies while Xi(-)/h(-) stays approximately constant. A hydrodynamically inspired model fit Xi spectra, which assumes a thermalized source, seems indicate that these multistrange particles experience significant flow effect, but emitted when system is hotter smaller than values...
We report a measurement of the longitudinal double-spin asymmetry ALL and differential cross section for inclusive midrapidity jet production in polarized proton collisions at √s=200 GeV. The data cover transverse momenta 5<pT<50 GeV/c agree with next-to-leading order perturbative QCD evaluations. 5<pT<17 disfavor 98% C.L. maximal positive gluon polarization nucleon.Received 10 August 2006DOI:https://doi.org/10.1103/PhysRevLett.97.252001©2006 American Physical Society
We report results on rho(770)(0)-->pi(+)pi(-) production at midrapidity in p+p and peripheral Au+Au collisions sqrt[s(NN)]=200 GeV. This is the first direct measurement of heavy-ion collisions. The measured rho(0) peak invariant mass distribution shifted by approximately 40 MeV/c(2) minimum bias interactions 70 shift dependent transverse momentum multiplicity. modification meson mass, width, shape due to phase space dynamical effects are discussed.
Identified mid-rapidity particle spectra of $\pi^{\pm}$, $K^{\pm}$, and $p(\bar{p})$ from 200 GeV p+p d+Au collisions are reported. A time-of-flight detector based on multi-gap resistive plate chamber technology is used for identification. The particle-species dependence the Cronin effect observed to be significantly smaller than that at lower energies. ratio nuclear modification factor ($R_{dAu}$) between protons $(p+\bar{p})$ charged hadrons ($h$) in transverse momentum range...
Results on high transverse momentum charged particle emission with respect to the reaction plane are presented for $\mathrm{A}\mathrm{u}+\mathrm{A}\mathrm{u}$ collisions at $\sqrt{{s}_{NN}}=200\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}$. Two- and four-particle correlations results as well a comparison of azimuthal in those $p+p$ same energy. The elliptic anisotropy ${v}_{2}$ is found reach its maximum ${p}_{t}\ensuremath{\sim}3\text{ }\mathrm{G}\mathrm{e}\mathrm{V}/c$, then decrease...
We report the measurements of $\Sigma (1385)$ and $\Lambda (1520)$ production in $p+p$ $Au+Au$ collisions at $\sqrt{s_{NN}} = 200$ GeV from STAR collaboration. The yields $p_{T}$ spectra are presented discussed terms chemical thermal freeze-out conditions compared to model predictions. Thermal microscopic models do not adequately describe all resonances produced central collisions. Our results indicate that there may be a time-span between during which elastic hadronic interactions occur.
We use the combined galform semi-analytical model of galaxy formation and grasil spectrophotometric code to investigate properties galaxies selected via their submillimetre (submm) emission. The fiducial we has previously been shown fit local Ultra-Luminous Infrared Galaxies, as well number counts faint submm galaxies. Here, test in more detail by comparing SEDs stellar, dynamical, gas halo masses against observational data. precisely mimic radio selection function observations show that...