R. Belmont
A5028375071- 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
- Pediatric Urology and Nephrology Studies
- Dark Matter and Cosmic Phenomena
- Superconducting Materials and Applications
- Stochastic processes and statistical mechanics
- Particle Detector Development and Performance
- Statistical Methods and Bayesian Inference
- Laser Material Processing Techniques
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Laser-induced spectroscopy and plasma
- Cold Atom Physics and Bose-Einstein Condensates
- Analytical Chemistry and Sensors
- Optical properties and cooling technologies in crystalline materials
- Quantum, superfluid, helium dynamics
- Computational Physics and Python Applications
- Laser-Matter Interactions and Applications
- Diamond and Carbon-based Materials Research
- Markov Chains and Monte Carlo Methods
- Research Data Management Practices
- scientometrics and bibliometrics research
University of Colorado Boulder
2015-2024
University of Michigan–Ann Arbor
2013-2024
University of North Carolina at Greensboro
2019-2024
Astronomy and Space
2024
University of Colorado System
2019-2024
Vanderbilt University
2011-2020
Rikkyo University
2020
Centre National de la Recherche Scientifique
2020
Institut National de Physique Nucléaire et de Physique des Particules
2020
Oak Ridge National Laboratory
2020
Flow coefficients v_n for n = 2, 3, 4, characterizing the anisotropic collective flow in Au+Au collisions at sqrt(s_NN) 200 GeV, are measured relative to event planes \Psi_n determined large rapidity. We report as a function of transverse momentum and collision centrality, study correlations among different order n. The well described by hydrodynamic models which employ Glauber Monte Carlo initial state geometry with fluctuations, providing additional constraining power on interplay between...
The PHENIX collaboration at the Relativistic Heavy Ion Collider (RHIC) reports measurements of azimuthal dihadron correlations near midrapidity in $d$$+$Au collisions $\sqrt{s_{_{NN}}}$=200 GeV. These complement recent analyses by experiments Large Hadron (LHC) involving central $p$$+$Pb $\sqrt{s_{_{NN}}}$=5.02 TeV, which have indicated strong anisotropic long-range angular distributions hadron pairs. origin these anisotropies is currently unknown. Various competing explanations include...
The second Fourier component ${v}_{2}$ of the azimuthal anisotropy with respect to reaction plane is measured for direct photons at midrapidity and transverse momentum (${p}_{T}$) $1--12\text{ }\text{ }\mathrm{GeV}/c$ in $\mathrm{Au}+\mathrm{Au}$ collisions $\sqrt{{s}_{NN}}=200\text{ }\mathrm{GeV}$. Previous measurements this quantity hadrons ${p}_{T}<6\text{ indicate that medium behaves like a nearly perfect fluid, while ${p}_{T}>6\text{ reduced interpreted terms path-length dependence...
We report the first results of elliptic ($v_2$), triangular ($v_3$) and quadrangular flow ($v_4$) charged particles in Pb-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV with ALICE detector CERN Large Hadron Collider. The measurements are performed central pseudorapidity region $|\eta|<0.8$ for transverse momentum range $0.2<p_{\rm T}<5$ GeV/$c$. anisotropic is measured using two-particle correlations a gap greater than one unit multi-particle cumulant method. Compared to from NN}}=2.76$ TeV,...
Heavy quarkonia are observed to be suppressed in relativistic heavy-ion collisions relative their production $p+p$ scaled by the number of binary collisions. In order determine if this suppression is related color screening these states produced medium, one needs account for other nuclear modifications including those cold matter. paper, we present new measurements from PHENIX 2007 data set $J/\ensuremath{\psi}$ yields at forward rapidity ($1.2<|y|<2.2$) $\text{Au}+\text{Au}$...
The elliptic flow coefficient (v 2) of identified particles in Pb-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}}=2.76 TeV was measured with the ALICE detector Large Hadron Collider (LHC). results were obtained Scalar Product method, a two-particle correlation technique, using pseudo-rapidity gap |Δη| > 0.9 between hadron under study and reference particles. v 2 is reported for π ±, K±, K S 0 , \mathrm{p}+\overline{\mathrm{p}} ϕ, \Lambda +\overline{\Lambda} {\Xi}^{-}+{\overline{\Xi}}^{+}...
The production of the strange and double-strange baryon resonances ( $$\Sigma (1385)^{\pm }$$ , $$\Xi (1530)^{0}$$ ) has been measured at mid-rapidity $$\left| y \right| $$ $$<0.5$$ in proton–proton collisions $$\sqrt{s}$$ $$=$$ 7 TeV with ALICE detector LHC. Transverse momentum spectra for inelastic are compared to QCD-inspired models, which general underpredict data. A search $$\phi (1860)$$ pentaquark, decaying \pi channel, carried out but no evidence is seen.
We present azimuthal angular correlations between charged hadrons and energy deposited in calorimeter towers central d+Au minimum bias p+p collisions at √sNN=200 GeV. The hadron is measured midrapidity |η|<0.35, the large rapidity (−3.7<η<−3.1, Au-going direction). An enhanced near-side correlation across |Δη|>2.75 observed collisions. Using event plane method applied to distribution, we extract anisotropy strength v2 for inclusive up pT=4.5 GeV/c. also measurement of identified π±...
We present the first measurement of elliptic (v2) and triangular (v3) flow in high-multiplicity 3He+Au collisions at √sNN=200 GeV. Two-particle correlations, where particles have a large separation pseudorapidity, are compared p+p indicate that collective effects dominate second third Fourier components for correlations observed system. The behavior is quantified terms v2 v3 anisotropy coefficients measured with respect to their corresponding event planes. values comparable those previously...
Direct photons produced in relativistic heavy-ion collisions allow access to the state of matter during collision, because they do not experience strong interaction and can escape from fireball without scattering. New data PHENIX experiment at RHIC show that as a function impact parameter yield direct increases much more rapidly than particle production, which provides new evidence for emission system when it was most hot dense.
The production of prompt charmed mesons D0, D+ and D∗+, their antiparticles, was measured with the ALICE detector in Pb-Pb collisions at centre-of-mass energy per nucleon pair, $$ \sqrt{s_{\mathrm{NN}}} , 2.76 TeV. yields for rapidity |y| < 0.5 are presented as a function transverse momentum, p T, interval 1–36 GeV/c centrality class 0–10% 1–16 30–50%. nuclear modification factor R AA computed using proton-proton reference \sqrt{s}=2.76 TeV, based on measurements \sqrt{s}=7 TeV theoretical...
The transverse momentum (${p}_{T}$) spectra and ratios of identified charged hadrons (${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$, ${K}^{\ifmmode\pm\else\textpm\fi{}}$, $p$, $\overline{p}$) produced in $\sqrt{{s}_{{}_{NN}}}=200$ GeV $\mathrm{Au}+\mathrm{Au}$ $d+\text{Au}$ collisions are reported five different centrality classes for each collision species. measurements pions protons up to ${p}_{T}=6$ GeV/$c$ (5 GeV/$c$), the kaons ${p}_{T}=4$ (3.5 GeV/$c$) ($d+\text{Au}$) collisions....
The ALICE Collaboration at the LHC has measured detailed properties of distribution prompt charmed mesons produced in Pb-Pb collisions. These are during very early stages results provide crucial information to determine most important physical processes for theoretical models.
We present the first measurement at LHC of exclusive J/$\psi$ photoproduction off protons, in ultra-peripheral proton-lead collisions $\sqrt{s_{\rm NN}}=5.02$ TeV. Events are selected with a dimuon pair produced either rapidity interval, laboratory frame, $2.5<y<4$ (p-Pb) or $-3.6<y<-2.6$ (Pb--p), and no other particles observed ALICE acceptance. The measured cross sections $\sigma (\gamma + {\rm p} \rightarrow J/\psi p})$ 33.2 $\pm$ 2.2 (stat) 3.1 (syst) 0.7 (theo) nb p-Pb 284 36...
Transverse momentum $({p}_{\mathrm{T}})$ spectra of pions, kaons, and protons up to ${p}_{\mathrm{T}}=20\phantom{\rule{0.28em}{0ex}}\text{GeV}/c$ have been measured in Pb-Pb collisions at $\sqrt{{s}_{\mathit{NN}}}=2.76\phantom{\rule{0.28em}{0ex}}\text{TeV}$ using the ALICE detector for six different centrality classes covering 0%--80%. The proton-to-pion kaon-to-pion ratios both show a distinct peak ${p}_{\mathrm{T}}\ensuremath{\approx}3\phantom{\rule{0.28em}{0ex}}\text{GeV}/c$ central that...
Back-to-back hadron pair yields in d+Au and p+p collisions at sqrt(s_NN)=200 GeV were measured with the PHENIX detector Relativistic Heavy Ion Collider. Rapidity separated pairs detected trigger pseudorapidity |eta|<0.35 associated forward rapidity (deuteron direction, 3.0<eta<3.8). Pairs also both hadrons rapidity; this case yield of back-to-back small impact parameters is observed to be suppressed by a factor 10 relative collisions. The kinematics these expected probe partons Au nucleus...
We report on the first measurement of an excess in yield $J/\ensuremath{\psi}$ at very low transverse momentum (${p}_{T}<0.3\text{ }\text{ }\mathrm{GeV}/c$) peripheral hadronic Pb-Pb collisions $\sqrt{{s}_{\mathrm{NN}}}=2.76\text{ }\mathrm{TeV}$, performed by ALICE CERN LHC. Remarkably, measured nuclear modification factor rapidity range $2.5<y<4$ reaches about 7 (2) ${p}_{T}$ $0--0.3\text{ }\mathrm{GeV}/c$ 70%--90% (50%--70%) centrality class. The production cross section associated with...
We present results for three charmonia states (${\ensuremath{\psi}}^{\ensuremath{'}}$, ${\ensuremath{\chi}}_{c}$, and $J/\ensuremath{\psi}$) in $d+\mathrm{Au}$ collisions at $|y|<0.35$ $\sqrt{{s}_{NN}}=200\text{ }\text{ }\mathrm{GeV}$. find that the modification of ${\ensuremath{\psi}}^{\ensuremath{'}}$ yield relative to $J/\ensuremath{\psi}$ scales approximately with charged particle multiplicity midrapidity across $p+A$, $d+\mathrm{Au}$, $A+A$ from Super Proton Synchrotron Relativistic...
The ${p}_{T}$-differential production cross sections of the prompt charmed mesons ${D}^{0}$, ${D}^{+}$, ${D}^{*+}$, and ${D}_{s}^{+}$ their charge conjugate in rapidity interval $\ensuremath{-}0.96<{y}_{\text{cms}}<0.04$ were measured $p\text{\ensuremath{-}}\mathrm{Pb}$ collisions at a center-of-mass energy $\sqrt{{s}_{NN}}=5.02\text{ }\text{ }\mathrm{TeV}$ with ALICE detector LHC. nuclear modification factor ${R}_{p\mathrm{Pb}}$, quantifying $D$-meson yield relative to $pp$ scaled by number...
The production of K $$^{*}$$ (892) $$^{0}$$ and $$\phi $$ (1020) mesons has been measured in p–Pb collisions at $$\sqrt{s_{{\text {NN}}}}$$ $$=$$ 5.02 TeV. $$^{*0}$$ are reconstructed via their decay into charged hadrons with the ALICE detector rapidity range $$-0.5 <y <0$$ . transverse momentum spectra, as a function multiplicity, have p $$_{\mathrm {T}}$$ from 0 to 15 GeV/c for 0.3 21 Integrated yields, mean momenta particle ratios reported compared results pp $$\sqrt{s}$$ 7 TeV Pb–Pb 2.76...
The PHENIX experiment at the Relativistic Heavy Ion Collider has measured 2nd and 3rd order Fourier coefficients of azimuthal distributions direct photons emitted midrapidity in Au$+$Au collisions $\sqrt{s_{_{NN}}}=200$ GeV for various collision centralities. Combining two different analysis techniques, results were obtained transverse momentum range $0.4
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, $\mathrm{Cu}\phantom{\rule{0.16em}{0ex}}+\phantom{\rule{0.16em}{0ex}}\mathrm{Cu}$...
We have measured the azimuthal anisotropy of pi0's for 1 < pT 18 GeV/c Au+Au collisions at sqrt s_NN = 200 GeV. The observed shows a gradual decrease in 3 7 - 10 GeV/c, but remains positive beyond GeV/c. magnitude this is under-predicted, up to least by current perturbative QCD (pQCD) energy-loss model calculations. An estimate increase expected from initial-geometry modification due gluon saturation effects and fluctuations insufficient account discrepancy. Calculations which implement path...