A5007894770- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Neutrino Physics Research
- Nuclear reactor physics and engineering
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Medical Imaging Techniques and Applications
- Stochastic processes and statistical mechanics
- Statistical Methods and Bayesian Inference
- Distributed and Parallel Computing Systems
- Nuclear physics research studies
- Particle Accelerators and Free-Electron Lasers
- Fluid Dynamics and Turbulent Flows
- Gamma-ray bursts and supernovae
- Atomic and Subatomic Physics Research
- Markov Chains and Monte Carlo Methods
- Radiation Therapy and Dosimetry
- Big Data Technologies and Applications
- International Science and Diplomacy
- Optical properties and cooling technologies in crystalline materials
Massachusetts Institute of Technology
2016-2025
Institute of High Energy Physics
2013-2024
A. Alikhanyan National Laboratory
2022-2024
University of Antwerp
2024
Moscow Institute of Thermal Technology
2024
University of Minnesota
2014-2023
European Organization for Nuclear Research
1999-2017
University of California, Davis
1999-2017
IIT@MIT
2006-2016
University of Maryland, College Park
2002-2015
Measurements of charged pion and kaon production in central Pb+Pb collisions at 40, 80, 158 A GeV are presented. These compared with data lower higher energies as well results from $p+p$ interactions. The mean multiplicity per wounded nucleon increases approximately linearly ${s}_{\mathrm{NN}}^{1/4}$ a change slope starting the region 15--40 GeV. suppression respect to interactions, observed low collision energies, enhancement high occurs about 40A nonmonotonic energy dependence ratio...
Results on charged pion and kaon production in central Pb+Pb collisions at 20A 30A GeV are presented compared to data lower higher energies. A rapid change of the energy dependence is observed around for yields pions kaons as well shape transverse mass spectra. The compatible with prediction that threshold a state deconfined matter early stage located low SPS
This Letter presents measurements of the elliptic flow charged particles as a function pseudorapidity and centrality from Cu-Cu collisions at 62.4 200 GeV using PHOBOS detector Relativistic Heavy Ion Collider. The in is found to be significant even for most central events. For comparison with Au-Au results, it that detailed way which collision geometry (eccentricity) estimated critical importance when scaling out system-size effects. A new form eccentricity, called participant introduced...
This report presents the capabilities of CMS experiment to explore rich heavy-ion physics programme offered by CERN Large Hadron Collider (LHC). The collisions lead nuclei at energies , will probe quark and gluon matter unprecedented values energy density. prime goal this research is study fundamental theory strong interaction — Quantum Chromodynamics (QCD) in extreme conditions temperature, density parton momentum fraction (low-x).
Pseudorapidity distributions of charged particles emitted in $Au+Au$, $Cu+Cu$, $d+Au$, and $p+p$ collisions over a wide energy range have been measured using the PHOBOS detector at RHIC. The centrality dependence both particle multiplicity midrapidity were measured. with $|\eta|<5.4$, which account for between 95% 99% total charged-particle emission associated collision participants, are presented different centralities. Both density, $dN_{ch}/d\eta$, multiplicity, $N_{ch}$, found to...
Directed and elliptic flow measurements for charged pions protons are reported as a function of transverse momentum, rapidity, centrality 40A 158AGeV Pb+Pb collisions, recorded by the NA49 detector. Both standard method correlating particles with an event plane cumulant studying multiparticle correlations used. In directed is corrected conservation momentum. reconstructed from genuine four-, six-, eight-particle correlations, showing first unequivocal evidence collective motion in A+A...
We present measurements of the pseudorapidity distribution primary charged particles produced in $\mathrm{A}\mathrm{u}+\mathrm{A}\mathrm{u}$ collisions at three energies, $\sqrt{{s}_{NN}}=19.6$, 130, and 200 GeV, for a range collision centralities. The narrows more central excess are high peripheral collisions. For given centrality, however, distributions found to scale with energy according ``limiting fragmentation'' hypothesis. universal fragmentation region described by this scaling grows...
Results of resonance searches in the Xi(-)pi(-), Xi(-)pi(+), Xi;(+)pi(-), and Xi;(+)pi(+) invariant mass spectra proton-proton collisions at sqrt[s]=17.2 GeV are presented. Evidence is shown for existence a narrow Xi(-)pi(-) baryon with 1.862+/-0.002 GeV/c(2) width below detector resolution about 0.018 GeV/c(2). The significance estimated to be above 4.2sigma. This state candidate hypothetical exotic Xi(--)(3/2) S=-2, I=3 / 2, quark content (dsdsū). At same mass, peak observed Xi(-)pi(+)...
In this paper, we investigate various ways of defining the initial source eccentricity using Monte Carlo Glauber (MCG) approach. particular, examine participant eccentricity, which quantifies shape by major axes ellipse formed interaction points participating nucleons. We show that reasonable variation density parameters in calculation, as well variations how matter production is modeled, do not significantly modify already established behavior a function collision centrality. Focusing on...
Net proton and negative hadron spectra for central \PbPb collisions at 158 GeV per nucleon the CERN SPS were measured compared to from lighter systems. baryon distributions derived those of net protons, utilizing model calculations isospin contributions as well data strange distributions. Stopping (rapidity shift with respect beam) mean transverse momentum \meanpt baryons increase system size. The rapidity density hadrons scales number participant nucleons nuclear collisions, whereas their...
We present the first measurement of pseudorapidity densities primary charged particles near midrapidity in Au+Au collisions at sqrt[s(NN)] = 56 and 130 GeV. For most central collisions, we find charged-particle density to be dN/deta|(|eta|<1) 408+/-12(stat)+/-30(syst) GeV 555+/-12(stat)+/-35(syst) GeV, values that are higher than any previously observed nuclear collisions. Compared proton-antiproton our data show an increase per participant by more 40% energy.
A measurement of two-particle correlations with a high transverse momentum trigger particle (p_T^{trig} > 2.5 GeV/c) is presented for Au+Au collisions at sqrt(s_NN) = 200 GeV over the uniquely broad longitudinal acceptance PHOBOS detector (-4 < \Delta\eta 2). broadening away-side azimuthal correlation compared to elementary observed all \Delta\eta. As in p+p collisions, near-side characterized by peak correlated partners small angle relative particle. However, central an additional extended...
We have measured transverse momentum distributions of charged hadrons produced in d+Au collisions at sqrt[s(NN)]=200 GeV. The spectra were obtained for momenta 0.25<p(T)<6.0 GeV/c, a pseudorapidity range 0.2<eta<1.4 the deuteron direction. evolution with collision centrality is presented comparison to p+pmacr; same energy. With increasing centrality, yield high increases more rapidly than overall particle density, leading strong modification spectral shape. This change shape qualitatively...
This Rapid Communication describes the measurement of elliptic flow for charged particles in Au+Au collisions at $\sqrt{{s}_{\mathit{NN}}}=200$ GeV using PHOBOS detector Relativistic Heavy Ion Collider. The measured azimuthal anisotropy is presented over a wide range pseudorapidity three broad collision centrality classes first time this energy. Two distinct methods extracting signal were used to reduce systematic uncertainties. falls sharply with increasing $|\ensuremath{\eta}|$ 200 all...
The directed and elliptic flow of protons charged pions has been observed from the semicentral collisions a 158 GeV/nucleon Pb beam with target. rapidity transverse momentum dependence measured. is opposite to that but both exhibit negative at low pt. fairly independent rises pt.Received 10 November 1997DOI:https://doi.org/10.1103/PhysRevLett.80.4136©1998 American Physical Society
The charged-particle pseudorapidity density dNch/dη has been measured for Au+Au collisions at √sNN=130GeV RHIC, using the PHOBOS apparatus. total number of charged particles produced 3% most-central |η|≤5.4 is found to be 4200±470. evolution with centrality discussed, and compared model calculations data from proton-induced collisions. show an enhancement in production midrapidity, while fragmentation regions, results are consistent expectations pp pA scattering.Received 6 June...
The PHOBOS experiment has measured the charged particle multiplicity at mid-rapidity in Au+Au collisions sqrt(s_NN) = 200 GeV as a function of collision centrality. Results on dN/deta(eta<1) divided by number participating nucleon pairs, , are presented . As was found from similar data 130 GeV, can be equally well described parton saturation models and two-component fits which include contributions that scale Npart binary collisions, Ncoll. We compare two energies means ratio R(200/130)...
We present transverse momentum distributions of charged hadrons produced in Au+Au collisions at sqrt(s_NN) = 200 GeV. The spectra were measured for momenta p_T from 0.25 to 4.5 GeV/c a rapidity range 0.2 < y_pi 1.4. evolution the is studied as function collision centrality, 65 344 participating nucleons. results are compared data proton-antiproton and lower RHIC energies. find significant change spectral shape between peripheral collisions. Comparing central collisions, we that yields...
The transverse mass ${m}_{t}$ distributions for antiprotons are measured at midrapidity minimum bias Pb+Pb collisions 158A GeV and central 20A, 30A, 40A, 80A beam energies in the fixed target experiment NA49 CERN SPS. rapidity density $\mathit{dn}/\mathit{dy}$, inverse slope parameter T, mean $\ensuremath{\langle}{m}_{t}\ensuremath{\rangle}$ derived from studied as a function of incident energy collision centrality compared to relevant data on proton production. shapes $\overline{p}$ p very...
The transverse mass ${m}_{t}$ distributions for deuterons and protons are measured in $\text{Pb}+\text{Pb}$ reactions near midrapidity the range $0<{m}_{t}\ensuremath{-}m<1.0\phantom{\rule{0.3em}{0ex}}(1.5)\phantom{\rule{0.3em}{0ex}}\text{GeV}∕{c}^{2}$ minimum bias collisions at $158A\phantom{\rule{0.3em}{0ex}}\text{GeV}$ central 40 $80\phantom{\rule{0.3em}{0ex}}A\phantom{\rule{0.3em}{0ex}}\text{GeV}$ beam energies. rapidity density $dn∕dy$, inverse slope parameter $T$ mean $⟨{m}_{t}⟩$...
This Letter describes the measurement of energy dependence elliptic flow for charged particles in $\mathrm{Au}+\mathrm{Au}$ collisions using PHOBOS detector at Relativistic Heavy Ion Collider. Data taken collision energies $\sqrt{{s}_{NN}}=19.6$, 62.4, 130, and 200 GeV are shown over a wide range pseudorapidity. These results, when plotted as function ${\ensuremath{\eta}}^{\ensuremath{'}}=|\ensuremath{\eta}|\ensuremath{-}{y}_{\mathrm{beam}}$, scale with approximate linearity throughout...