A5017954928- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Distributed and Parallel Computing Systems
- Particle Detector Development and Performance
- Advanced Data Storage Technologies
- Nuclear reactor physics and engineering
- Scientific Computing and Data Management
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Muon and positron interactions and applications
- Advanced NMR Techniques and Applications
- Parallel Computing and Optimization Techniques
- Statistical Methods and Bayesian Inference
- Advanced Software Engineering Methodologies
- Cosmology and Gravitation Theories
- Radiation Detection and Scintillator Technologies
- Software Engineering Research
- Pulsars and Gravitational Waves Research
- Nuclear physics research studies
- Radiation Effects in Electronics
- Service-Oriented Architecture and Web Services
- Distributed systems and fault tolerance
European Organization for Nuclear Research
2016-2025
A. Alikhanyan National Laboratory
2015-2024
University of Bergen
2016-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Bologna
2012-2023
University of Houston
2023
Technical University of Munich
2021
State Innovation Exchange
2009-2018
Goethe University Frankfurt
2005-2015
Frankfurt Institute for Advanced Studies
2015
Academy of Scientific Research and Technology
2013
ALICE (A Large Ion Collider Experiment) is a general-purpose, heavy-ion detector at the CERN LHC which focuses on QCD, strong-interaction sector of Standard Model. It designed to address physics strongly interacting matter and quark-gluon plasma extreme values energy density temperature in nucleus-nucleus collisions. Besides running with Pb ions, programme includes collisions lighter lower dedicated proton-nucleus runs. will also take data proton beams top collect reference for several QCD...
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
In this paper measurements are presented of $\rm \pi$$^+$, \pi$$^-$, K$^+$, K$^-$, p and $\overline{\rm p}$ production at mid-rapidity < 0.5, in Pb-Pb collisions $\sqrt{s_{\rm NN}} = 2.76$ TeV as a function centrality. The measurement covers the transverse momentum ($p_{\rm T}$) range from 100, 200, 300 MeV/$c$ up to 3, 4.6 GeV/$c$, for $\rm\pi$, K, respectively. measured $p_{\rm T}$ distributions yields compared expectations based on hydrodynamic, thermal recombination models. spectral...
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...
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...
This publication describes the methods used to measure centrality of inelastic Pb-Pb collisions at a center-of-mass energy 2.76 TeV per colliding nucleon pair with ALICE. The is key parameter in study properties QCD matter extreme temperature and density, because it directly related initial overlap region nuclei. Geometrical collision, such as number participating nucleons binary nucleon-nucleon collisions, are deduced from Glauber model sharp impact selection shown be consistent those...
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 measurement of K(S)(0) and Λ production at midrapidity in Pb-Pb collisions √(s(NN))=2.76 TeV is presented. transverse momentum (p(T)) spectra are shown for several collision centrality intervals the p(T) range from 0.4 GeV/c (0.6 Λ) to 12 GeV/c. dependence Λ/K(S)(0) ratios exhibits maxima vicinity 3 GeV/c, positions shift towards higher with increasing centrality. magnitude these increases by almost a factor three between most peripheral central collisions. This baryon excess...
Angular correlations between unidentified charged trigger particles and various species of associated (unidentified particles, pions, kaons, protons antiprotons) are measured by the ALICE detector in p-Pb collisions at a nucleon-nucleon centre-of-mass energy 5.02 TeV transverse-momentum range $0.3 < p_{\rm T} 4$ GeV/$c$. The expressed as yield per particle obtained pseudorapidity $|\eta_{\rm lab}|<0.8$. Fourier coefficients extracted from long-range projected onto azimuthal angle difference...
The pseudorapidity density and multiplicity distribution of charged particles produced in proton-proton collisions at the LHC, a centre-of-mass energy $\sqrt{s} = 7$ TeV, were measured central region |$\eta$| < 1. Comparisons are made with previous measurements $\sqrt{s}$ 0.9 TeV 2.36 TeV. At 7 for events least one particle 1, we obtain dNch/deta 6.01 $\pm$ 0.01 (stat.) $^{+0.20}_{-0.12}$ (syst.). This corresponds to an increase 57.6% 0.4% $^{+3.6}_{-1.8}$% (syst.) relative significantly...
The production of $\pi^+$, $\pi^-$, $K^+$, $K^-$, p, and pbar at mid-rapidity has been measured in proton-proton collisions $\sqrt{s} = 900$ GeV with the ALICE detector. Particle identification is performed using specific energy loss inner tracking silicon detector time projection chamber. In addition, time-of-flight information used to identify hadrons higher momenta. Finally, distinctive kink topology weak decay charged kaons for an alternative measurement kaon transverse momentum ($p_{\rm...
The ALICE experiment has measured the inclusive J/$\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....
The production of ${\rm\Xi}^-$ and ${\rm\Omega}^-$ baryons their anti-particles in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV has been measured using the ALICE detector. transverse momentum spectra mid-rapidity ($|y| < 0.5$) for charged $\rm\Xi$ $\rm\Omega$ hyperons have studied range $0.6 p_{\rm T} 8.0$ GeV/$c$ $1.2 7.0$ GeV/$c$, respectively, several centrality intervals (from most central 0-10% to peripheral 60-80% collisions). These compared with predictions recent hydrodynamic...
Measurements of charge-dependent azimuthal correlations with the ALICE detector at LHC are reported for Pb-Pb collisions $\sqrt{{s}_{NN}}=2.76\text{ }\text{ }\mathrm{TeV}$. Two- and three-particle in pseudorapidity range $|\ensuremath{\eta}|<0.8$ presented as a function collision centrality, particle separation pseudorapidity, transverse momentum. A clear signal compatible relative to reaction plane is observed, which shows little or no energy dependence when compared measurements RHIC...
The pseudorapidity density of charged particles ($\mathrm{d}N_\mathrm{ch}/\mathrm{d}\eta$) at mid-rapidity in Pb-Pb collisions has been measured a center-of-mass energy per nucleon pair $\sqrt{s_{\rm NN}}$ = 5.02 TeV. It increases with centrality and reaches value $1943 \pm 54$ $|\eta|<0.5$ for the 5% most central collisions. A rise $\mathrm{d}N_\mathrm{ch}/\mathrm{d}\eta$ as function is observed, steeper than that observed proton-proton following trend established by measurements lower...
Transverse momentum spectra of $π^{\pm}$, $\rm K^{\pm}$ and p($\bar{\rm p}$) up to $p_{\rm T}$ = 20 GeV/$c$ at mid-rapidity in pp Pb-Pb collisions $\sqrt{s_{\rm NN}}=$ 2.76 TeV have been measured using the ALICE detector Large Hadron Collider. The proton-to-pion kaon-to-pion ratios both show a distinct peak T} \approx 3 GeV/c$ central collisions. Below peak, < GeV/$c$, are good agreement with hydrodynamical calculations, suggesting that itself is dominantly result radial flow rather than...
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 -...
Direct photon production at mid-rapidity in Pb-Pb collisions $\sqrt{s_{_{\mathrm{NN}}}} = 2.76$ TeV was studied the transverse momentum range $0.9 < p_\mathrm{T} 14$ GeV$/c$. Photons were detected with highly segmented electromagnetic calorimeter PHOS and via conversions ALICE detector material $e^+e^-$ pair reconstructed central tracking system. The results of two methods combined direct spectra measured for 0-20%, 20-40%, 40-80% centrality classes. For all three classes, agreement found...
The inclusive J/ψ nuclear modification factor (RAA) in Pb–Pb collisions at sNN=2.76TeV has been measured by ALICE as a function of centrality the e+e− decay channel mid-rapidity (|y|<0.8) and centrality, transverse momentum rapidity μ+μ− forward-rapidity (2.5<y<4). yields are suppressed compared to those pp scaled number binary collisions. RAA integrated over range corresponding 90% inelastic cross section is 0.72±0.06(stat.)±0.10(syst.) 0.58±0.01(stat.)±0.09(syst.) forward-rapidity. At low...
The ALICE Collaboration has made the first measurement at LHC of J/ψ photoproduction in ultra-peripheral Pb–Pb collisions sNN=2.76TeV. is identified via its dimuon decay forward rapidity region with muon spectrometer for events where hadronic activity required to be minimal. analysis based on an event sample corresponding integrated luminosity about 55 μb−1. cross section coherent production interval −3.6<y<−2.6 measured dσJ/ψcoh/dy=1.00±0.18(stat)−0.26+0.24(syst)mb. result compared...
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...