Refine
Year of publication
- 2019 (283) (remove)
Document Type
- Article (129)
- Preprint (110)
- Doctoral Thesis (21)
- Conference Proceeding (17)
- Contribution to a Periodical (4)
- Habilitation (1)
- Master's Thesis (1)
Has Fulltext
- yes (283)
Is part of the Bibliography
- no (283) (remove)
Keywords
- Hadron-Hadron scattering (experiments) (4)
- Heavy Ion Experiments (4)
- Heavy-ion collisions (4)
- ALICE (3)
- LHC (2)
- Lattice QCD (2)
- NA61/SHINE (2)
- Phase Diagram of QCD (2)
- QCD equation of state (2)
- QCD phase diagram (2)
- Quasi-free scattering (2)
- elliptic flow (2)
- gravitational wave (2)
- heavy-ion collisions (2)
- (Anti-)(Hyper-)Nuclei (1)
- 3D printing (1)
- 4-ROD RFQ (1)
- Accelerators & Beams (1)
- Actuators (1)
- Antimatter (1)
- Arms (1)
- Atomic and molecular interactions with photons (1)
- Atomic, Molecular & Optical (1)
- Binary Neutron Star Mergers (1)
- Biological locomotion (1)
- Boltzmann-Vlasov equation (1)
- Bottomonium (1)
- Bubble-like structure (1)
- CBM (1)
- CBM experiment (1)
- CERN SPS (1)
- CLVisc (1)
- CMOS (1)
- CMOS Monolithic Active Pixel Sensor (1)
- Charmonium (1)
- Chemical physics (1)
- Chiral Lagrangians (1)
- Chiral phase transition (1)
- Color screening (1)
- Cross sections (1)
- Design, synthesis and processing (1)
- Dielectron (1)
- Diffusion (1)
- Direct nuclear reactions (1)
- Discontinous Galerkin methods for Numerical Relativity (1)
- Drip-line nucleus (1)
- Dynamical systems (1)
- Effective QCD model (1)
- Eingebettetes optisches System (1)
- Einplatinene Kamera (1)
- Electromagnetic probes (1)
- Electronic properties and materials (1)
- Exotica (1)
- Final state (1)
- Flow (1)
- Formulations of Einstein Field Equations (1)
- Free-electron lasers (1)
- Fringe field (1)
- GRMHD (1)
- Gap field (1)
- GdIr2Si2 (1)
- General properties of QCD (dynamics, confinement, etc.) (1)
- General relativistic hydrodynamics (1)
- Gluons (1)
- Heavy Ion Collisions (1)
- Heavy Ion Phenomenology (1)
- Heavy ion storage ring (1)
- Heavy-Ion Collision (1)
- Heavy-flavour production (1)
- Heavy-ion (1)
- Heavy-ion collision (1)
- IPGLASMA (1)
- Infrared light (1)
- Initial state (1)
- Inverse kinematics (1)
- J/ψ (1)
- Ladder-RFQ (1)
- Laminar flow (1)
- Langmuir-Blodgett monolayer (1)
- Laser-produced plasmas (1)
- Light (1)
- Magnetic properties and materials (1)
- Mechanical engineering (1)
- Multiple Charge Conservation (1)
- Nanophotonics and plasmonics (1)
- Nanowires (1)
- New magicity (1)
- Nichtinvasiv (1)
- Nonequilibrium dynamics (1)
- Nuclear Physics (1)
- Nuclear astrophysics (1)
- Nuclear physics of explosive environments (1)
- Nuclear reactions (1)
- One-nucleon removal (1)
- Orbital electron capture (1)
- Other nonperturbative calculations (1)
- Pairing reentrance (1)
- Particle correlations and fluctuations (1)
- Parton cascade BAMPS (1)
- Path integral duality (1)
- Phase transitions and critical phenomena (1)
- Pixel detector (1)
- Plasma-based accelerators (1)
- Plasmons Quantum mechanics (1)
- Polarization (1)
- Production mechanisms (1)
- Prototypes (1)
- QCD Phenomenology (1)
- QCD phase transition (1)
- QGP (1)
- Quantum corrected black hole (1)
- Quantum modified Gravity (1)
- Quark-Gluon Plasma (1)
- Quark-Gluon-Plasma (1)
- RFQ (1)
- RHIC (1)
- Radiation Tolerance (1)
- Radiation detectors (1)
- Radiative capture (1)
- Regeneration (1)
- Robotic behavior (1)
- Robots (1)
- Self-triggered front-end electronics (1)
- Shell model (1)
- Silicon tracking system (1)
- Single particle decay spectroscopy (1)
- Small systems (1)
- Spectators (1)
- Spectroscopic factors (1)
- Strangeness (1)
- String T-duality (1)
- Sub-wavelength optics (1)
- Thermoplasma acidophilum (1)
- Thermoplasma volcanium (1)
- TmRh2Si2 (1)
- Toroidales Magnetfeld (1)
- Transport Theory (1)
- Two body weak decay (1)
- Two-dimensional materials (1)
- Vertex Detector (1)
- Wigner function (1)
- Zero-point length (1)
- active perception (1)
- additive manufacturing (1)
- anisotropic azimuthal correlation (1)
- anisotropic flow (1)
- atomic force microscopy (1)
- autonomous learning (1)
- bacteriorhodopsin reconstitution (1)
- baryon stopping (1)
- binary neutron star merger (1)
- binary neutron star mergers (1)
- binocular vision (1)
- black lipid membrane (1)
- blue bronze (1)
- bulk observables (1)
- charge density wave (1)
- chiral effect (1)
- cluster expansion model (1)
- coherent emission (1)
- continuum model (1)
- correlated electrons (1)
- correlations (1)
- deep learning (1)
- directed flow (1)
- early diabetes detection (1)
- efficient coding (1)
- electro-magnetic plasma (1)
- electromagnetic fields (1)
- electromagnetic probes (1)
- endoplasmic reticulum (1)
- equation of state (1)
- extra dimensions (1)
- finite baryon density (1)
- flux growth (1)
- focused electron beam induced deposition (1)
- focused electron beam-induced deposition (1)
- functional principal component analysis (1)
- global jets (1)
- gravitational waves (1)
- hadron gas (1)
- hadron transport (1)
- hadron-quark phase transition (1)
- heavy ion collision (1)
- heavy ion collisions (1)
- heavy ions (1)
- helical magnetic fields (1)
- high energy astrophysics (1)
- high energy physics (1)
- higher twist effects (1)
- hot spots (1)
- hybrid star (1)
- hydrogen energy levels (1)
- hyperons (1)
- initial state (1)
- intrinsic motivation (1)
- jets (1)
- kink-like instability (1)
- light nuclei (1)
- light-driven ATP synthesis (1)
- liposomes (1)
- machine learning (1)
- magnetism (1)
- main phospholipid (1)
- millimeter-wave spectroscopy (1)
- minimal length (1)
- modified Coulomb potential (1)
- multiparton interactions (1)
- mushroom instability (1)
- music charts (1)
- nano-fabrication (1)
- nano-printing (1)
- neutron star (1)
- neutron star properties (1)
- neutron-star-merger (1)
- non-invasive diagnosis techniques (1)
- nucleon coalescence (1)
- numerical relativity (1)
- optokinetic nystagmus (1)
- oxysterol-binding protein homology protein (1)
- parity-doublet model (1)
- particle-in-cell simulations (1)
- phase transition (1)
- phonon (1)
- phosphatidylinositol 4-phosphate 5-kinase (1)
- phosphatidylserine (1)
- plasma membrane (1)
- precursor residence time (1)
- proton permeability (1)
- quark matter (1)
- quark‐gluon plasm (1)
- recollimation shocks (1)
- relativistic astrophysics (1)
- relativistic heavy ion reactions (1)
- relativistic heavy-ion collisions (1)
- relativistic hydrodynamics (1)
- relativistic jets (1)
- resonance properties (1)
- scanning probe microscopy (1)
- self-organized criticalit (1)
- small systems (1)
- smooth pursuit (1)
- social acceleration (1)
- spectators (1)
- spin polarization (1)
- sterol (1)
- string T-duality (1)
- string fragmentation (1)
- sustained hyperglycemia (1)
- terahertz (1)
- tetraether lipid (1)
- the Weibel instability (1)
- time scales (1)
- time-resolved (1)
- tip fabrication (1)
- total cross-section (1)
- transport models (1)
- transport theory (1)
- triangular flow (1)
- unsaturated phospholipid (1)
- viscosity (1)
- viscous hydrodynamics (1)
- zero-point length (1)
Institute
- Physik (283) (remove)
Previous calculations of the shear viscosity to entropy density ratio in the hadron gas have failed to reach a consensus, with η/s predictions differing by almost an order of magnitude. This work addresses and solves this discrepancy by providing an independent extraction of η/s using the newly-developed SMASH (Simulating Many Accelerated Strongly-interacting Hadrons) transport code and the Green-Kubo formalism. We compare the results from SMASH with numerical solutions of the Boltzmann equation for various systems using the Chapman-Enskog expansion as well as previous results in the literature. Substantial deviations of the coefficient are found between transport approaches mainly based on resonance propagation with finite lifetime (such as SMASH) and other (semi-analytical) approaches with energy-dependent cross-sections, where interactions do not introduce a timescale other than the inverse scattering rate. Our conclusion is that long- lived resonances strongly affect the transport properties of the system, resulting in significant differences in η/s with respect to other approaches where binary collisions dominate. We argue that the relaxation time of the system —which characterizes the shear viscosity— is determined by the interplay between the mean- free time and the lifetime of resonances. We finally show how an artificial shortening of the resonance lifetimes or the addition of a background elastic cross section nicely interpolate between the two discrepant results.
We present an analysis of the anisotropic flow harmonics in Pb+Pb collisions at beam momenta of 30A GeV/c collected by the NA61/SHINE experiment in the year 2016. Directed and elliptic flow coefficients are measured relative to the spectator plane estimated with the Projectile Spectators Detector (PSD). The flow coefficients are reported as a function of transverse momentum in different classes of collision centrality. The results are compared with a new analysis of the NA49 data for Pb+Pb collisions at 40A GeV using forward calorimeters (VCal and RCal) for event plane estimation.
The relativistic method of moments is one of the most successful approaches to extract second order viscous hydrodynamics from a kinetic underlying background. The equations can be systematically improved to higher order, and they have already shown a fast convergence to the kinetic results. In order to generalize the method we introduced long range effects in the form of effective (medium dependent) masses and gauge (coherent) fields. The most straightforward generalization of the hydrodynamic expansion is problematic at higher order. Instead of introducing an additional set of approximations, we propose to rewrite the series in terms of moments resumming the contributions of infinite non-hydrodynamics modes. The resulting equations are are consistent with hydrodynamics and well defined at all order. We tested the new approximation against the exact solutions of the Maxwell-Boltzmann-Vlasov equations in (0 + 1)-dimensions, finding a fast and stable convergence to the exact results.
The transverse momentum (pT) differential yields of (anti-)3He and (anti-)3H measured in p-Pb collisions at sNN−−−√ = 5.02 TeV with ALICE at the LHC are presented. The ratios of the pT-integrated yields of (anti-)3He and (anti-)3H to the proton yields are reported, as well as the pT dependence of the coalescence parameters B3 for (anti-)3He and (anti-)3H. For (anti-)3He, the results obtained in four classes of the mean charged-particle multiplicity density are also discussed. These results are compared to predictions from a canonical statistical hadronization model and coalescence approaches. An upper limit on the total yield of 4He¯ is determined.
The ALICE collaboration performed the first rapidity-differential measurement of coherent J/ψ photoproduction in ultra-peripheral Pb-Pb collisions at a center-of-mass energy sNN−−−√ = 5.02 TeV. The J/ψ is detected via its dimuon decay in the forward rapidity region (−4.0<y<−2.5) for events where the hadronic activity is required to be minimal. The analysis is based on an event sample corresponding to an integrated luminosity of about 750 μb−1. The cross section for coherent J/ψ production is presented in six rapidity bins. The results are compared with theoretical models for coherent J/ψ photoproduction. These comparisons indicate that gluon shadowing effects play a role in the photoproduction process. The ratio of ψ′ to J/ψ coherent photoproduction cross sections was measured and found to be consistent with that measured for photoproduction off protons.
The coherent photoproduction of J/ψ was measured in ultra-peripheral Pb-Pb collisions at a center-of-mass energy sNN−−−√=5.02 TeV with the ALICE detector. The J/ψ is detected via its dimuon decay in the forward rapidity region for events where the hadronic activity is required to be minimal. The analysis is based on an event sample corresponding to an integrated luminosity of about 750 μb−1. The cross section for coherent J/ψ production is presented in six rapidity bins, covering the interval −4.0<y<−2.5. The results are compared with theoretical models for coherent J/ψ photoproduction. The results indicate that gluon shadowing effects play a role in the photoproduction process. The ratio of ψ′ to J/ψ coherent photoproduction cross sections was measured and found to be consistent with that measured for photoproduction off protons.
The cross section of jets reconstructed from charged particles is measured in the transverse momentum range of 5<pT<100 GeV/c in pp collisions at the center-of-mass energy of s√=5.02 TeV with the ALICE detector. The jets are reconstructed using the anti-kT algorithm with resolution parameters R=0.2, 0.3, 0.4, and 0.6 in the pseudorapidity range |η|<0.9−R. The charged jet cross sections are compared with the leading order (LO) and to next-to-leading order (NLO) perturbative Quantum ChromoDynamics (pQCD) calculations. It was found that the NLO calculations agree better with the measurements. The cross section ratios for different resolution parameters were also measured. These ratios increase from low pT to high pT and saturate at high pT, indicating that jet collimation is larger at high pT than at low pT. These results provide a precision test of pQCD predictions and serve as a baseline for the measurement in Pb−Pb collisions at the same energy to quantify the effects of the hot and dense medium created in heavy-ion collisions at the LHC.
The cross section of jets reconstructed from charged particles is measured in the transverse momentum range of 5<pT<100 GeV/c in pp collisions at the center-of-mass energy of s√=5.02 TeV with the ALICE detector. The jets are reconstructed using the anti-kT algorithm with resolution parameters R=0.2, 0.3, 0.4, and 0.6 in the pseudorapidity range |η|<0.9−R. The charged jet cross sections are compared with the leading order (LO) and to next-to-leading order (NLO) perturbative Quantum ChromoDynamics (pQCD) calculations. It was found that the NLO calculations agree better with the measurements. The cross section ratios for different resolution parameters were also measured. These ratios increase from low pT to high pT and saturate at high pT, indicating that jet collimation is larger at high pT than at low pT. These results provide a precision test of pQCD predictions and serve as a baseline for the measurement in Pb−Pb collisions at the same energy to quantify the effects of the hot and dense medium created in heavy-ion collisions at the LHC.
The cross section of jets reconstructed from charged particles is measured in the transverse momentum range of 5<pT<100 GeV/c in pp collisions at the center-of-mass energy of s√=5.02 TeV with the ALICE detector. The jets are reconstructed using the anti-kT algorithm with resolution parameters R=0.2, 0.3, 0.4, and 0.6 in the pseudorapidity range |η|<0.9−R. The charged jet cross sections are compared with the leading order (LO) and to next-to-leading order (NLO) perturbative Quantum ChromoDynamics (pQCD) calculations. It was found that the NLO calculations agree better with the measurements. The cross section ratios for different resolution parameters were also measured. These ratios increase from low pT to high pT and saturate at high pT, indicating that jet collimation is larger at high pT than at low pT. These results provide a precision test of pQCD predictions and serve as a baseline for the measurement in Pb−Pb collisions at the same energy to quantify the effects of the hot and dense medium created in heavy-ion collisions at the LHC.
Measurement of the production of charm jets tagged with D0 mesons in pp collisions at √s = 7 TeV
(2019)
The production of charm jets in proton-proton collisions at a center-of-mass energy of s√=7 TeV was measured with the ALICE detector at the CERN Large Hadron Collider. The measurement is based on a data sample corresponding to a total integrated luminosity of 6.23 nb−1, collected using a minimum-bias trigger. Charm jets are identified by the presence of a D0 meson among their constituents. The D0 mesons are reconstructed from their hadronic decay D0→K−π+. The D0-meson tagged jets are reconstructed using tracks of charged particles (track-based jets) with the anti-kT algorithm in the jet transverse momentum range 5<pchT,jet<30 GeV/c and pseudorapidity |ηjet|<0.5. The fraction of charged jets containing a D0-meson increases with pchT,jet from 0.042±0.004(stat)±0.006(syst) to 0.080±0.009(stat)±0.008(syst). The distribution of D0-meson tagged jets as a function of the jet momentum fraction carried by the D0 meson in the direction of the jet axis (zch||) is reported for two ranges of jet transverse momenta, 5<pchT,jet<15 GeV/c and 15<pchT,jet<30 GeV/c in the intervals 0.2<zch||<1.0 and 0.4<zch||<1.0, respectively. The data are compared with results from Monte Carlo event generators (PYTHIA 6, PYTHIA 8 and Herwig 7) and with a Next-to-Leading-Order perturbative Quantum Chromodynamics calculation, obtained with the POWHEG method and interfaced with PYTHIA 6 for the generation of the parton shower, fragmentation, hadronisation and underlying event.