C. A. Pruneau
A5058187734- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Nuclear reactor physics and engineering
- Particle Detector Development and Performance
- Nuclear physics research studies
- Radiation Detection and Scintillator Technologies
- Dark Matter and Cosmic Phenomena
- Nuclear Physics and Applications
- Pulsars and Gravitational Waves Research
- X-ray Spectroscopy and Fluorescence Analysis
- Atomic and Molecular Physics
- Stochastic processes and statistical mechanics
- Statistical Methods and Bayesian Inference
- Cosmology and Gravitation Theories
- CCD and CMOS Imaging Sensors
- Cold Atom Physics and Bose-Einstein Condensates
- Computational Physics and Python Applications
- Gamma-ray bursts and supernovae
- Atomic and Subatomic Physics Research
- Laser-induced spectroscopy and plasma
- Pediatric Urology and Nephrology Studies
- Markov Chains and Monte Carlo Methods
- Electron and X-Ray Spectroscopy Techniques
- Theoretical and Computational Physics
Wayne State University
2016-2025
A. Alikhanyan National Laboratory
2015-2024
Williams (United States)
2024
William & Mary
2024
Financiadora de Estudos e Projetos
2023
National Council for Scientific and Technological Development
2023
National Nuclear Research Center
2023
COMSATS University Islamabad
2023
Shandong University
2023
Weatherford College
2023
We discuss various measures of net charge (conserved quantities) fluctuations proposed for the identification critical phenomena in heavy ion collisions. show dynamical component can be expressed simply terms integrals two- and single-particle densities. dependence fluctuation observables on detector acceptance, detection efficiency colliding system size, collision centrality. Finally, we present a toy model particle production including conservation resonance to gauge effects such...
Event shapes for Au + collisions at 11.4 GeV/c per nucleon were studied over nearly the full solid angle with E877 apparatus. The analysis was performed by Fourier expansion of azimuthal distributions transverse energy (ET) measured in different pseudorapidity intervals. For semicentral a pronounced event anisotropy is identified clear forward-backward anticorrelation. In forward interval up to 9% ET directed component. signal decreases peripheral and very central collisions.Received 12 May...
Results are presented of an analysis proton and charged pion azimuthal distributions measured with respect to the reaction plane in Au + collisions at a beam momentum about 11A GeV/c. The anisotropy is studied as function particle rapidity transverse for different centralities collisions. triple differential (in rapidity, momentum, angle) reconstructed. A comparison results previous charged-particle energy flow well model predictions presented.Received 30 June...
Experimental results and a detailed analysis are presented of the transverse energy charged particle azimuthal distributions measured by E877 Collaboration for different centralities Au+Au collisions at beam momentum 10.8$A$ GeV/$c$. The anisotropy these is studied with respect to reaction plane reconstructed on an event-by-event basis using distribution calorimeters. Results corrected resolution. For semicentral events we observe directed flow signals up 10%. We stronger slow particles....
Abstract Balance functions have been regarded in the past as a method of investigating late-stage hadronization found presence strongly-coupled medium. They are also used to constrain mechanisms particle production large and small collision systems. Charge balance for inclusive identified pairs reported function charged multiplicity proton–proton collisions simulated with PYTHIA8 EPOS4 models. The charge inclusive, pion, kaon, proton exhibit amplitudes shapes that depend on species differ...
We present proton and pion tranverse momentum spectra rapidity distributions for Au+Au collisions at 10.8A GeV/c. The exhibit collective transverse flow effects. Evidence of the influence Coulomb interaction from fireball is found in spectra. data are compared with predictions RQMD event generator.
We present measurements from BNL AGS Experiment 864 of the $_{\ensuremath{\Lambda}}^{3}\mathrm{H}$ yield and an upper limit on $_{\ensuremath{\Lambda}}^{4}\mathrm{H}$ in central $11.5A\phantom{\rule{0.3em}{0ex}}\text{GeV}∕c\phantom{\rule{0.3em}{0ex}}\text{Au}+\text{Pt}$ collisions. The span a rapidity range center mass, ${y}_{\mathrm{c.m.}}$, to ${y}_{\mathrm{c.m.}}+1$ transverse momentum $0<{p}_{t}\ensuremath{\leqslant}1.5\phantom{\rule{0.3em}{0ex}}\text{GeV}∕c$. compare these results with...
We present a systematic study of transverse energy (${\mathit{E}}_{\mathit{T}}$) production in collisions 11.4A GeV/c Au and 14.6A Si ions with targets Al, Au, Pb. Comparison data for Au+Au Si+Al indicates that, the heavier system, there is an increase amount stopping which accompanied by decrease width ${\mathit{dE}}_{\mathit{T}}$/d\ensuremath{\eta} distribution. The ratio maximum ${\mathit{E}}_{\mathit{T}}$ observed two systems significantly greater than total available center mass frame.
We report on measurements by the E864 experiment at BNL-AGS of yields light nuclei in collisions 197Au with beam momentum 11.5AGeV/c targets 208Pb and 197Pt. The are reported for baryon number A=1 up to A=7, typically cover a rapidity range from yc.m. yc.m.+1 transverse approximately 0.1<~pT/A<~0.5GeV/c. calculate coalescence scale factors BA which we extract model-dependent source dimensions collective flow velocities. also examine dependences number, spin, isospin produced nuclei.Received...
We have measured cross sections for the synthesis of nuclei mass A≤4 in collisions 14.6A GeV/c 28Si with targets Pb, Cu, and Al. The data are at close to center-of-mass rapidities, unique their exploration centrality dependence nucleosynthesis. Simple coalescence models that were used study nucleosynthesis lower energies inadequate description our measurements. Our improved extract parameters related size interaction volume freeze-out.Received 2 March...
We present measurements of pion transverse momentum (pt) spectra in central Si-nucleus collisions the rapidity range 2.0 < y 5.0 for pt down to and including = 0. The data exhibit an enhanced yield at low compared what is expected a purely thermal spectral shape. This enhancement used determine Δ resonance abundance freeze-out. results are consistent with direct measurement by reconstruction proton-pion pairs imply temperature system freeze-out close 140 MeV.
I discuss the role and impact of net-baryon number conservation in measurements net proton fluctuations heavy-ion collisions. show that magnitude is entirely determined by strength two particle correlations. At LHC top RHIC energy, this implies are proportional to integral balance function (BF), $B^{p\bar p}$ protons anti-protons, while context beam energy scan (BES), one must also account for correlations "stopped" protons. The measured a $4\pi$ detector depends on relative cross-sections...
This paper formalizes the use of integral and differential cumulants for measurements multiparticle event-by-event transverse momentum fluctuations, rapidity as well net-charge fluctuations. enables introduction balance functions, defined based on correlation functions (factorial cumulants), that suppress two- three-prong resonance decays effects enable underlying long-range correlations obeying quantum number conservation constraints. These satisfy simple sum rules determined by...
We present Experiment 864's measurement of invariant antideuteron yields in 11.5A GeV/c Au+Pt collisions. The analysis includes 250×106 triggers representing 14×109 10% central interactions sampled for events with high mass candidates. find (1/2πpt)d2N/dydpt=3.5±1.5(stat)−0.5+0.9(syst)×10−8GeV−2c2 1.8<y<2.2, 〈pt〉=0.35GeV/c ( yc.m.=1.6) and 3.7±2.7(stat)−1.5+1.4(syst)×10−8 GeV−2c2 1.4<y<1.8, 〈pt〉=0.26GeV/c, a coalescence parameter B2¯ 4.1±2.9(stat)−2.4+2.3(syst)×10−3GeV2c−3. Implications...
Two-particle correlation functions for positive and negative pions have been measured in $\mathrm{Au}+\mathrm{Au}$ collisions at 10.8 GeV/c per nucleon. The data were analyzed using one- three-dimensional functions. From the results of fit phase space density was calculated. It is consistent with local thermal equilibrium.
We present results from MiniMax (Fermilab T-864), a small test/experiment at the Tevatron designed to search for production of disoriented chiral condensate (DCC) in $p - \bar p$ collisions $\sqrt{s} = 1.8$ TeV forward direction, $\sim 3.4 < \eta \sim 4.2$. Data, consisting $1.3 \times 10^6$ events, are analyzed using robust observables developed an earlier paper. The consistent with generic, binomial-distribution partition pions into charged and neutral species. Limits on DCC various models...
We introduce and compare three differential correlation functions for the study of transverse-momentum correlations in $p+p$ $A+A$ collisions. These consist inclusive eventwise a version measure $\stackrel{~}{C}$ introduced by Gavin [1] experimental viscosity per unit entropy matter produced quantitative difference between observables on basis PYTHIA simulations collisions consisting an arbitrary superposition collision events at $\sqrt{s}=200$ GeV. observe that are remarkably similar to...
The use of charge balance functions in heavy-ion collision studies was initially proposed as a probe delayed hadronization and two-stage quark production these collisions. It later emerged that general can also serve the diffusivity light quarks well evolution systems formed In this work, we reexamine formulation consider how to best define measure correlation terms differences conditional densities unlike-sign like-sign particle pairs. We associated show obey simple sum rule. additionally...
The superdeformed band in $^{149}\mathrm{Gd}$ has been populated with various input angular momenta and excitation energies. These, together all other available data, indicate that the necessary criterion for populating bands is to form cold residual nuclei at spins higher than those where states become yrast. In addition, decrease intensity as it gated by higher-energy $\ensuremath{\gamma}$ rays does not support predictions based on a recently proposed feeding mechanism of these states.
We present results of a search for strange quark matter (strangelets) in 11.5AGeV/cAu+Pb collisions from the 1994 and 1995 runs experiment E864 at Brookhaven's Alternating Gradient Synchrotron. observe no strangelet candidates set 90% confidence level upper limit approximately 3×10−8 per 10% central interaction production |Z|=1 |Z|=2 strangelets over large mass range with metastable lifetimes about 50 ns or more. These place constraints primarily on quark-gluon plasma based models...
Correlation functions measured as a function of $\ensuremath{\Delta}\ensuremath{\eta},\ensuremath{\Delta}\ensuremath{\phi}$ have emerged powerful tool to study the dynamics particle production in nuclear collisions at high energy. They are however subject, like any other observables, instrumental effects which must be properly accounted for extract meaningful physics results. We compare merits several techniques used towards measurement these correlation collisions. discuss and distinguish...