Refine
Year of publication
Document Type
- Preprint (666)
- Article (431)
- Part of a Book (7)
- Working Paper (2)
Has Fulltext
- yes (1106)
Keywords
- Heavy Ion Experiments (20)
- Hadron-Hadron Scattering (11)
- Hadron-Hadron scattering (experiments) (11)
- LHC (9)
- Heavy-ion collision (6)
- ALICE experiment (4)
- Collective Flow (4)
- Jets (4)
- NASH (4)
- Quark-Gluon Plasma (4)
- ALICE (3)
- Ausdruck (3)
- Heavy Ions (3)
- Jets and Jet Substructure (3)
- NAFLD (3)
- inflammation (3)
- portal hypertension (3)
- pp collisions (3)
- Beauty production (2)
- Benjamin, Walter (2)
- Charm physics (2)
- Experimental nuclear physics (2)
- Experimental particle physics (2)
- Heavy Quark Production (2)
- Lepton-Nucleon Scattering (experiments) (2)
- Musik (2)
- Particle Correlations and Fluctuations (2)
- Particle and resonance production (2)
- Particle correlations and fluctuations (2)
- Pb–Pb collisions (2)
- QCD (2)
- Single electrons (2)
- cirrhosis (2)
- liver fibrosis (2)
- steatosis (2)
- 900 GeV (1)
- A survivor from Warsaw (1)
- ACLF (1)
- ADGRE1 (1)
- ALD (1)
- ALICE detector (1)
- Angiogenesis (1)
- Angiography (1)
- Anti-nuclei (1)
- Ausdruck, Begriff (1)
- Blood (1)
- Blood plasma (1)
- Boosted Jets (1)
- Centrality Class (1)
- Centrality Selection (1)
- Cirrhosis (1)
- Collagen (1)
- Collective Flow, (1)
- Comparison with QCD (1)
- Darwin, Charles (1)
- Das Passagen-Werk (1)
- Dramaturgie (1)
- EMR1 (1)
- Einkommenselastizität (1)
- Elastic scattering (1)
- Electron-pion identification (1)
- Electroweak interaction (1)
- Elementarschadenversicherung (1)
- Elliptic flow (1)
- Engel, Johann Jakob (1)
- Erinnerung (1)
- Evolution (1)
- Extracellular matrix (1)
- F4/80 (1)
- Femtoscopy (1)
- Fibre/foam sandwich radiator (1)
- Florida (1)
- Gedenken (1)
- Genetics (1)
- Geschichte 1700-1850 (1)
- Geschichte der deutschen Sprache (1)
- Ghana (1)
- Grimm, Jacob (1)
- HBT (1)
- Hadron production (1)
- Hadron-Hadron Scattering Heavy (1)
- Hadron-hadron interactions (1)
- Hadronization (1)
- Hagelversicherung (1)
- Hard Scattering (1)
- Hausratversicherung (1)
- Heavy Ion Experiment (1)
- Heavy flavor production (1)
- Heavy flavour production (1)
- Heavy ion collisions (1)
- Heavy ions (1)
- Heavy-flavour decay muons (1)
- Heavy-flavour production (1)
- Heavy-ion collisions (1)
- Hepatic stellate cell (1)
- Inclusive spectra (1)
- Intensity interferometry (1)
- Invariant Mass Distribution (1)
- Ionisation energy loss (1)
- Jet Physics (1)
- Jet Substructure (1)
- Judenvernichtung (1)
- Klang (1)
- Kommunikationsverhalten (1)
- Komposition <Musik> (1)
- Liver fibrosis (1)
- Material budget (1)
- Mechanisms of disease (1)
- Metalloproteinases (1)
- Mid-rapidity (1)
- Minimum Bias (1)
- Molecular biology (1)
- Molecular medicine (1)
- Monte Carlo (1)
- Multi-Parton Interactions (1)
- Multi-strange baryons (1)
- Multi-wire proportional drift chamber (1)
- Musikpsychologie (1)
- Musikästhetik (1)
- Nachfrage (1)
- Net-charge correlations (1)
- Net-charge fluctuations (1)
- Neural network (1)
- Nono, Luigi (1)
- Nuclear modification factor (1)
- Oper und Drama (1)
- PDE‐5‐inhibitor (1)
- PYTHIA (1)
- Paris (1)
- Particle and Resonance Production (1)
- Pb–Pb (1)
- Polarization (1)
- Portal hypertension (1)
- Portal veins (1)
- Preiselastizität (1)
- Production Cross Section (1)
- Properties of Hadrons (1)
- Proton–proton (1)
- Quark Deconfinement (1)
- Quark Gluon Plasma (1)
- Quark Production (1)
- Quark gluon plasma (1)
- Quarkonium (1)
- Rapidity Range (1)
- Relativistic heavy ion physics (1)
- Relativistic heavy-ion collisions (1)
- Resolution Parameter (1)
- Ricorda cosa ti hanno fatto in Auschwitz (1)
- Roux-en-Y gastric bypass (1)
- Sachversicherung (1)
- Schuluniform (1)
- Schätzung (1)
- Schönberg, Arnold (1)
- Single muons (1)
- Single-molecule biophysics (1)
- Sturmversicherung (1)
- Super-resolution microscopy (1)
- Systematic Uncertainty (1)
- TGF-β1 (1)
- TGR(mREN2)27 (1)
- TR (1)
- The expression of the emotions in man and animals (1)
- Time Projection Chamber (1)
- Tonsprache <Musik> (1)
- Tracking (1)
- Transition radiation detector (1)
- Transverse momentum (1)
- Trigger (1)
- Ueber musikalische Malerey (1)
- Vector Boson Production (1)
- Verbraucherverhalten (1)
- Versicherungswissenschaft (1)
- Wagner, Richard (1)
- Western diet (1)
- White blood cells (1)
- Wissenschaft (1)
- Xenon-based gas mixture (1)
- acute-on-chronic liver failure (ACLF) (1)
- acute‐on‐chronic liver failure (1)
- alcoholic fatty liver disease (1)
- animal model (1)
- bacterial translocation (1)
- caspase-1 (1)
- circulation (1)
- dE/dx (1)
- decompensated liver cirrhosis (1)
- detector (1)
- erectile dysfunction (1)
- experimental results (1)
- fibrosis (1)
- heavy ion experiments (1)
- hemodynamic (1)
- hepatic stellate cells (1)
- hepatocellular cancer (1)
- immunity (1)
- in vitro models (1)
- inflammasome (1)
- lipid droplets (1)
- lipidomics (1)
- liver steatosis (1)
- macrophage (1)
- metabolic liver disease (1)
- metabolomics (1)
- mini gastric bypass (1)
- monocyte chemotactic protein 1 (MCP-1) (1)
- mouse (1)
- non-alcoholic fatty liver disease (1)
- non‐selective beta‐blocker (1)
- one anastomosis gastric bypass (1)
- quark gluon plasma (1)
- renin-angiotensin system (1)
- spectra (1)
- transjugular intrahepatic portosystemic shunt (TIPS) (1)
- weight loss (1)
- Ästhetik (1)
- Überleben (1)
- √sN N = 2.76 TeV (1)
- fibrogenesis (1)
Institute
- Physik (1068)
- Frankfurt Institute for Advanced Studies (FIAS) (959)
- Informatik (920)
- Medizin (20)
- Biochemie und Chemie (3)
- Informatik und Mathematik (3)
- Ernst Strüngmann Institut (2)
- Hochschulrechenzentrum (2)
- MPI für Hirnforschung (2)
- Sonderforschungsbereiche / Forschungskollegs (2)
The production yield of prompt D mesons and their elliptic flow coefficient v2 were measured with the Event-Shape Engineering (ESE) technique applied to mid-central (10–30% and 30–50% centrality classes) Pb-Pb collisions at the centre-of-mass energy per nucleon pair sNN−−−√=5.02 TeV, with the ALICE detector at the LHC. The ESE technique allows the classification of events, belonging to the same centrality, according to the azimuthal anisotropy of soft particle production in the collision. The reported measurements give the opportunity to investigate the dynamics of charm quarks in the Quark-Gluon Plasma and provide information on their participation in the collective expansion of the medium. D mesons were reconstructed via their hadronic decays at mid-rapidity, |η| < 0.8, in the transverse momentum interval 1 < pT < 24 GeV/c. The v2 coefficient is found to be sensitive to the event-shape selection confirming a correlation between the D-meson azimuthal anisotropy and the collective expansion of the bulk matter, while the per-event D-meson yields do not show any significant modification within the current uncertainties.
Medium modification of the shape of small-radius jets in central Pb-Pb collisions at √sNN = 2.76 TeV
(2018)
We present the measurement of a new set of jet shape observables for track-based jets in central Pb-Pb collisions at sNN−−−√=2.76 TeV. The set of jet shapes includes the first radial moment or angularity, g; the momentum dispersion, pTD; and the difference between the leading and sub-leading constituent track transverse momentum, LeSub. These observables provide complementary information on the jet fragmentation and can constrain different aspects of the theoretical description of jet-medium interactions. The jet shapes were measured for a small resolution parameter R = 0.2 and were fully corrected to particle level. The observed jet shape modifications indicate that in-medium fragmentation is harder and more collimated than vacuum fragmentation as obtained by PYTHIA calculations, which were validated with the measurements of the jet shapes in proton-proton collisions at s√=7 TeV. The comparison of the measured distributions to templates for quark and gluon-initiated jets indicates that in-medium fragmentation resembles that of quark jets in vacuum. We further argue that the observed modifications are not consistent with a totally coherent energy loss picture where the jet loses energy as a single colour charge, suggesting that the medium resolves the jet structure at the angular scales probed by our measurements (R = 0.2). Furthermore, we observe that small-R jets can help to isolate purely energy loss effects from other effects that contribute to the modifications of the jet shower in medium such as the correlated background or medium response.
Neutral pion and η meson invariant differential yields were measured in non-single diffractive p–Pb collisions at sNN−−−√ = 5.02 TeV with the ALICE experiment at the CERN LHC. The analysis combines results from three complementary photon measurements, utilizing the PHOS and EMCal calorimeters and the Photon Conversion Method. The invariant differential yields of π0 and η meson inclusive production are measured near mid-rapidity in a broad transverse momentum range of 0.3<pT<20 GeV/c and 0.7<pT<20 GeV/c, respectively. The measured η/π0 ratio increases with pT and saturates for pT > 4 GeV/c at 0.483±0.015stat±0.015sys. A deviation from mT scaling is observed for pT< 2 GeV/c. The measured η/π0 ratio is consistent with previous measurements from proton-nucleus and pp collisions over the full pT range. The measured η/π0 ratio at high pT also agrees within uncertainties with measurements from nucleus–nucleus collisions. The π0 and η yields in p–Pb relative to the scaled pp interpolated reference, RpPb, are presented for 0.3<pT< 20 GeV/c and 0.7<pT< 20 GeV/c, respectively. The results are compared with theoretical model calculations. The values of RpPb are consistent with unity for transverse momenta above 2 GeV/c. These results support the interpretation that the suppressed yield of neutral mesons measured in Pb–Pb collisions at LHC energies is due to parton energy loss in the hot QCD medium.
The ALICE Collaboration has measured the energy dependence of exclusive photoproduction of J/ψ vector mesons off proton targets in ultra–peripheral p–Pb collisions at a centre-of-mass energy per nucleon pair sNN−−−√=5.02 TeV. The e+e− and μ+μ− decay channels are used to measure the cross section as a function of the rapidity of the J/ψ in the range −2.5<y<2.7, corresponding to an energy in the γp centre-of-mass in the interval 40<Wγp<550 GeV. The measurements, which are consistent with a power law dependence of the exclusive J/ψ photoproduction cross section, are compared to previous results from HERA and the LHC and to several theoretical models. They are found to be compatible with previous measurements.
Two-particle correlations in high-energy collision experiments enable the extraction of particle source radii by using the Bose-Einstein enhancement of pion production at low relative momentum q ∝ 1/R. It was previously observed that in pp collisions at s√ = 7TeV the average pair transverse momentum kT range of such analyses is limited due to large background correlations which were attributed to mini-jet phenomena. To investigate this further, an event-shape dependent analysis of Bose-Einstein correlations for pion pairs is performed in this work. By categorizing the events by their transverse sphericity ST into spherical (ST > 0:7) and jet-like (ST < 0:3) events a method was developed that allows for the determination of source radii for much larger values of kT for the first time. Spherical events demonstrate little or no background correlations while jet-like events are dominated by them. This observation agrees with the hypothesis of a mini-jet origin of the non-femtoscopic background correlations and gives new insight into the physics interpretation of the kT dependence of the radii. The emission source size in spherical events shows a substantially diminished kT dependence, while jet-like events show indications of a negative trend with respect to kT in the highest multiplicity events. Regarding the emission source shape, the correlation functions for both event sphericity classes show good agreement with an exponential shape, rather than a Gaussian one.
The pT-differential production cross section of prompt Λ +c charmed baryons was measured with the ALICE detector at the Large Hadron Collider (LHC) in pp collisions at s√=7 TeV and in p-Pb collisions at sNN−−−√=5.02 TeV at midrapidity. The Λ +c and Λ¯¯¯¯c¯¯¯ were reconstructed in the hadronic decay modes Λ +c → pK−π+, Λ +c → pK 0S and in the semileptonic channel Λ +c → e+νeΛ (and charge conjugates). The measured values of the Λ +c/D0 ratio, which is sensitive to the c-quark hadronisation mechanism, and in particular to the production of baryons, are presented and are larger than those measured previously in different colliding systems, centre-of-mass energies, rapidity and pT intervals, where the Λ +c production process may differ. The results are compared with the expectations obtained from perturbative Quantum Chromodynamics calculations and Monte Carlo event generators. Neither perturbative QCD calculations nor Monte Carlo models reproduce the data, indicating that the fragmentation of heavy-flavour baryons is not well understood. The first measurement at the LHC of the Λ +c nuclear modification factor, RpPb, is also presented. The RpPb is found to be consistent with unity and with that of D mesons within the uncertainties, and consistent with a theoretical calculation that includes cold nuclear matter effects and a calculation that includes charm quark interactions with a deconfined medium.
The second (v2) and third (v3) flow harmonic coefficients of J/ψ mesons are measured at forward rapidity (2.5 < y < 4.0) in Pb-Pb collisions at sNN−−−√=5.02 TeV with the ALICE detector at the LHC. Results are obtained with the scalar product method and reported as a function of transverse momentum, pT, for various collision centralities. A positive value of J/ψ v3 is observed with 3.7σ significance. The measurements, compared to those of prompt D0 mesons and charged particles at mid-rapidity, indicate an ordering with vn(J/ψ) < vn(D0) < vn(h±) (n = 2, 3) at low and intermediate pT up to 6 GeV/c and a convergence with v2(J/ψ) ≈ v2(D0) ≈ v2(h±) at high pT above 6–8 GeV/c. In semi-central collisions (5–40% and 10–50% centrality intervals) at intermediate pT between 2 and 6 GeV/c, the ratio v3/v2 of J/ψ mesons is found to be significantly lower (4.6σ) with respect to that of charged particles. In addition, the comparison to the prompt D0-meson ratio in the same pT interval suggests an ordering similar to that of the v2 and v3 coefficients. The J/ψ v2 coefficient is further studied using the Event Shape Engineering technique. The obtained results are found to be compatible with the expected variations of the eccentricity of the initial-state geometry.
ϕ meson measurements provide insight into strangeness production, which is one of the key observables for the hot medium formed in high-energy heavy-ion collisions. ALICE measured ϕ production through its decay in muon pairs in Pb–Pb collisions at sNN−−−√=2.76 TeV in the intermediate transverse momentum range 2<pT<5 GeV/c and in the rapidity interval 2.5<y<4. The ϕ yield was measured as a function of the transverse momentum and collision centrality. The nuclear modification factor was obtained as a function of the average number of participating nucleons. Results were compared with the ones obtained via the kaon decay channel in the same pT range at midrapidity. The values of the nuclear modification factor in the two rapidity regions are in agreement within uncertainties.
Measurement of the inclusive J/ψ polarization at forward rapidity in pp collisions at √s=8 TeV
(2018)
We report on the measurement of the inclusive J/ψ polarization parameters in pp collisions at a center of mass energy s√=8 TeV with the ALICE detector at the LHC. The analysis is based on a data sample corresponding to an integrated luminosity of 1.23 pb−1. J/ψ resonances are reconstructed in their di-muon decay channel in the rapidity interval 2.5<y<4.0 and over the transverse-momentum interval 2<pT<15 GeV/c. The three polarization parameters (λθ, λφ, λθφ) are measured as a function of pT both in the helicity and Collins-Soper reference frames. The measured J/ψ polarization parameters are found to be compatible with zero within uncertainties, contrary to expectations from all available predictions. The results are compared with the measurement in pp collisions at s√=7 TeV.
The elliptic flow of inclusive and direct photons was measured at mid-rapidity in two centrality classes 0–20% and 20–40% in Pb–Pb collisions at √sNN = 2.76 TeV by ALICE. Photons were detected with the highly segmented electromagnetic calorimeter PHOS and via conversions in the detector material with the e+e− pairs reconstructed in the central tracking system. The results of the two methods were combined and the direct-photon elliptic flow was extracted in the transverse momentum range 0.9 < pT < 6.2 GeV/c. A comparison to RHIC data shows a similar magnitude of the measured directphoton elliptic flow. Hydrodynamic and transport model calculations are systematically lower than the data, but are found to be compatible.