A5019486663- 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
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Superconducting Materials and Applications
- Pulsars and Gravitational Waves Research
- Radiation Detection and Scintillator Technologies
- Stochastic processes and statistical mechanics
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Computational Physics and Python Applications
- Statistical Methods and Bayesian Inference
- Atomic and Molecular Physics
- Theoretical and Computational Physics
- Radiation Effects in Electronics
- Scientific Research and Discoveries
- Magnetic confinement fusion research
- Gamma-ray bursts and supernovae
- Pediatric Urology and Nephrology Studies
- Distributed and Parallel Computing Systems
Goethe University Frankfurt
2016-2025
GSI Helmholtz Centre for Heavy Ion Research
2000-2025
Max Planck Institute for Nuclear Physics
1997-2025
A. Alikhanyan National Laboratory
2015-2024
University of Houston
2023-2024
Institut Laue-Langevin
2024
Istituto Nazionale di Fisica Nucleare, Sezione di Bologna
2012-2023
Homi Bhabha National Institute
2019-2023
Variable Energy Cyclotron Centre
2018-2023
COMSATS University Islamabad
2023
We report the first measurement of charged particle elliptic flow in Pb-Pb collisions at sqrt[S(NN)] =2.76 TeV with ALICE detector CERN Large Hadron Collider. The is performed central pseudorapidity region (|η|<0.8) and transverse momentum range 0.2<p t<5.0 GeV/c. signal v₂, measured using 4-particle correlation method, averaged over 0.087 ± 0.002(stat) 0.003(syst) 40%-50% centrality class. differential v₂ p t reaches a maximum 0.2 near =3 Compared to RHIC Au-Au 200 GeV, increases by about...
The centrality dependence of the charged-particle multiplicity density at midrapidity in Pb-Pb collisions sqrt[s_{NN}]=2.76 TeV is presented. normalized per participating nucleon pair increases by about a factor 2 from peripheral (70%-80%) to central (0%-5%) collisions. found be similar that observed lower collision energies. data are compared with models based on different mechanisms for particle production nuclear
We report on the first measurement of triangular ${v}_{3}$, quadrangular ${v}_{4}$, and pentagonal ${v}_{5}$ charged particle flow in Pb-Pb collisions at $\sqrt{{s}_{\mathrm{NN}}}=2.76\text{ }\text{ }\mathrm{TeV}$ measured with ALICE detector CERN Large Hadron Collider. show that can be described terms initial spatial anisotropy its fluctuations, which provides strong constraints origin. In most central events, where elliptic ${v}_{2}$ ${v}_{3}$ have similar magnitude, a double peaked...
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...
ALICE is a general-purpose heavy-ion experiment designed to study the physics of strongly interacting matter and quark–gluon plasma in nucleus–nucleus collisions at LHC. It currently involves more than 900 physicists senior engineers, from both nuclear high-energy sectors, over 90 institutions about 30 countries.
Inclusive transverse momentum spectra of primary charged particles in Pb–Pb collisions at sNN=2.76TeV have been measured by the ALICE Collaboration LHC. The data are presented for central and peripheral collisions, corresponding to 0–5% 70–80% hadronic cross section. particle |η|<0.8 0.3<pT<20GeV/c compared expectation pp same sNN, scaled number underlying nucleon–nucleon collisions. comparison is expressed terms nuclear modification factor RAA. result indicates only weak medium effects...
The first measurement of the charged-particle multiplicity density at midrapidity in Pb-Pb collisions a center-of-mass energy per nucleon pair $\sqrt{{s}_{NN}}=2.76\text{ }\text{ }\mathrm{TeV}$ is presented. For an event sample corresponding to most central 5% hadronic cross section, pseudorapidity primary charged particles $1584\ifmmode\pm\else\textpm\fi{}4(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}76(\mathrm{syst})$, which corresponds $8.3\ifmmode\pm\else\textpm\fi{}0.4(\mathrm{syst})$...
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
The first measurement of two-pion Bose-Einstein correlations in central Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 2.76$ TeV the Large Hadron Collider is presented. We observe a growing trend with energy now not only for longitudinal and outward but also sideward pion source radius. homogeneity volume decoupling time are significantly larger than those measured RHIC.
The ALICE experiment has measured the inclusive J/$\psi$ production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}} } = 2.76$ TeV down to zero transverse momentum rapidity range $2.5 < y 4$. A suppression of yield is observed with respect one pp scaled by number binary nucleon-nucleon collisions. nuclear modification factor, integrated over 0-80% most central collisions, $0.545 \pm 0.032 \rm{(stat.)} 0.083 \rm{(syst.)}$ and does not exhibit a significant dependence on collision centrality....
Angular correlations between unidentified charged trigger ($t$) and associated ($a$) particles are measured by the ALICE experiment in Pb-Pb collisions at $\sqrt{s_{\rm NN}}=2.76$ TeV for transverse momenta $0.25 < p_{T}^{t,\, a} 15$ GeV/$c$, where $p_{T}^t > p_{T}^a$. The shapes of pair correlation distributions studied a variety collision centrality classes 0 50% total hadronic cross section pseudorapidity interval $|\eta| 1.0$. Distributions relative azimuth $\Delta\phi \equiv \phi^t -...
The elliptic, $v_2$, triangular, $v_3$, and quadrangular, $v_4$, azimuthal anisotropic flow coefficients are measured for unidentified charged particles, pions (anti-)protons in Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 2.76$ TeV with the ALICE detector Large Hadron Collider. Results obtained event plane four-particle cumulant methods reported pseudo-rapidity range $|\eta|<0.8$ different collision centralities as a function of transverse momentum, $p_{\rm T}$, out to T}=20$ GeV/$c$. observed...
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...
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(+)...
A bstract The p t -differential inclusive production cross sections of the prompt charmed mesons D 0 , + and *+ in rapidity range | y < 0.5 were measured proton-proton collisions at $ \sqrt {s} = 7{ }TeV LHC using ALICE detector. Reconstructing decays → K − π their charge conjugates, about 8,400 2,900 2,600 with 1 24 GeV/ c counted, after selection cuts, a data sample 3.14 × 10 8 events collected minimum-bias trigger (integrated luminosity L int 5 nb −1 ). results are described within...
The production of mesons containing strange quarks (K$^0_s$, $\phi$) and both singly doubly baryons ($\Lambda$, Anti-$\Lambda$, $\Xi$+Anti-$\Xi$) are measured at central rapidity in pp collisions $\sqrt{s}$ = 0.9 TeV with the ALICE experiment LHC. results obtained from analysis about 250 k minimum bias events recorded 2009. Measurements yields (dN/dy) transverse momentum spectra rapidities for inelastic presented. For mesons, we report (<dN/dy>) 0.184 $\pm$ 0.002 stat. 0.006 syst. K$^0_s$...
The ALICE experiment at the LHC has studied inclusive J/$\psi$ production central and forward rapidities in pp collisions $\sqrt{s} = 7$ TeV. In this Letter, we report on first results obtained detecting through its dilepton decay into $e^+e^-$ $\mu^+\mu^-$ pairs rapidity range |y|<0.9 2.5<y<4, respectively, with acceptance down to zero $p_{\rm T}$. dielectron channel analysis was carried out a data sample corresponding an integrated luminosity $L_{\rm int}$ 5.6 nb$^{-1}$ number of signal...
The first measurements of the invariant differential cross sections inclusive π0 and η meson production at mid-rapidity in proton–proton collisions s=0.9TeV s=7TeV are reported. measurement covers ranges 0.4<pT<7GeV/c 0.3<pT<25GeV/c for these two energies, respectively. mesons was measured range 0.4<pT<15 GeV/c. Next-to-Leading Order perturbative QCD calculations, which consistent with spectrum s=0.9TeV, overestimate those s=7TeV, but agree η/π0 ratio s=7TeV.
$\ensuremath{\phi}$ meson production is studied by the NA49 Collaboration in central $\mathrm{Pb}+\mathrm{Pb}$ collisions at $20A,30A,40A,80A$, and $158A$ GeV beam energy. The data are compared with measurements lower higher energies microscopic thermal models. energy dependence of yields spectral distributions compatible assumption that partonic degrees freedom set low SPS energies.
We have studied J/psi production in pp collisions at $\sqrt{s}=7$ TeV the LHC through its muon pair decay. The polar and azimuthal angle distributions of decay muons were measured, results on J/$\psi$ polarization parameters $\lambda_{\theta}$ $\lambda_\phi$ obtained. study was performed kinematic region 2.5<y<4, 2<$p_{\rm T}$<8 GeV/$c$, helicity Collins-Soper reference frames. In both frames, are compatible with zero, within uncertainties.
We report on the high statistics two-pion correlation functions from $pp$ collisions at $\sqrt{s}=0.9\text{ }\text{ }\mathrm{TeV}$ and $\sqrt{s}=7\text{ }\mathrm{TeV}$, measured by ALICE experiment Large Hadron Collider. The as well extracted source radii scale with event multiplicity pair momentum. When analyzed in same transverse momentum range, is similar two collision energies. A three-dimensional femtoscopic analysis shows an increase of emission zone increasing decreasing homogeneity...
The production of K∗(892)0 and ϕ(1020) in pp collisions at $\sqrt{s}=7~\mathrm{TeV}$ was measured by the ALICE experiment LHC. yields transverse momentum spectra d2 N/dydp T midrapidity |y|<0.5 range 0<p T<6 GeV/c for 0.4<p are reported compared to model predictions. Using yield pions, kaons, Ω baryons previously $\sqrt{s}=7\ \mathrm{TeV}$ , ratios K∗/K−, ϕ/K∗, ϕ/K−, ϕ/π −, $(\Omega + \overline{\Omega })/\phi$ presented. values ϕ/K∗ ϕ/K− similar those found lower centre-of-mass energies. In...