Refine
Year of publication
Document Type
- Preprint (577)
- Article (386)
- Working Paper (6)
- Conference Proceeding (4)
Language
- English (973)
Has Fulltext
- yes (973)
Is part of the Bibliography
- no (973)
Keywords
- Heavy Ion Experiments (18)
- Hadron-Hadron scattering (experiments) (11)
- BESIII (8)
- Heavy-ion collision (6)
- LHC (6)
- Kollisionen schwerer Ionen (5)
- Europäische Union (4)
- Hadron-Hadron Scattering (4)
- Quark-Gluon Plasma (4)
- Verbraucherpreis (4)
- Währungsunion (4)
- heavy ion collisions (4)
- law of one price (4)
- purchasing power parity (4)
- relative price volatility (4)
- ALICE experiment (3)
- Branching fractions (3)
- EMU (3)
- Hadronic decays (3)
- Jets and Jet Substructure (3)
- Quark Gluon Plasma (3)
- spatial data (3)
- Accelerators & Beams (2)
- Atomic, Molecular & Optical (2)
- Beauty production (2)
- Charm physics (2)
- Charmonium (2)
- Cross section (2)
- Deflation (2)
- Deutschland (2)
- ECB Monetary Policy (2)
- Experimental nuclear physics (2)
- Experimental particle physics (2)
- Guidelines (2)
- Heavy Ions (2)
- Inflation (2)
- Inflation Convergence (2)
- Italien (2)
- Jets (2)
- Lepton-Nucleon Scattering (experiments) (2)
- Particle and resonance production (2)
- Particle correlations and fluctuations (2)
- Pb–Pb collisions (2)
- Portugal (2)
- Psychiatric disorders (2)
- QGP (2)
- Quark-Gluon-Plasma (2)
- Regional Diversity (2)
- Schweiz (2)
- Single electrons (2)
- Spanien (2)
- Trauma (2)
- UrQMD Modell (2)
- Währungskrise (2)
- contagion (2)
- currency crisis (2)
- gallbladder cancer (2)
- gallbladder cancer xenografts (2)
- pp collisions (2)
- quark-gluon-plasma (2)
- real exchange rate (2)
- Österreich (2)
- 17-AAG (1)
- ADHD (1)
- ALICE (1)
- ALICE detector (1)
- Absolute branching fraction (1)
- Accelerators & storage rings (1)
- Acute myeloid leukemia (1)
- Adult (1)
- Angular distribution (1)
- Annihilation (1)
- Anti-kaon–nucleon physics (1)
- Anti-nuclei (1)
- Atmospheric chemistry (1)
- Atmospheric science (1)
- Atomic & molecular beams (1)
- Ausbreitung (1)
- Beam loss (1)
- Bhabha (1)
- Big Five (1)
- Biological (1)
- Bloodstream infection (1)
- Bloodstream infections (1)
- Branching fraction (1)
- CDH13 (1)
- COVID-19 (1)
- Cancer (1)
- Cell membranes (1)
- Centrality Class (1)
- Centrality Selection (1)
- Charge-transfer collisions (1)
- Circular accelerators (1)
- Classification (1)
- Climate change (1)
- Clinical genetics (1)
- Closure (1)
- Cluster (1)
- Collective Flow (1)
- Conservative (1)
- Cross section measurements (1)
- D meson (1)
- D0 and D+ mesons (1)
- Dalitz decay (1)
- Distributed software development (1)
- D⁰ meson (1)
- Electromagnetic amplitude (1)
- Electromagnetic form factor (1)
- Electron-pion identification (1)
- Electronic transitions (1)
- Electroweak interaction (1)
- Elliptic flow (1)
- Embolization (1)
- Energie (1)
- Equation of state (1)
- Europäische Zentralbank (1)
- Fibre/foam sandwich radiator (1)
- Fistula (1)
- Geldpolitik (1)
- Geometrical modelling (1)
- Geometrisches Modellieren (1)
- Geschichte 1990-1999 (1)
- Gram negative bacteria (1)
- Guanine nucleotide exchange factors (1)
- Guanosine triphosphatase (1)
- HSP90 inhibitors (1)
- Hadron-Hadron Scattering Heavy (1)
- Hadron-hadron interactions (1)
- Hadronic cross section (1)
- Hadrons (1)
- Heavy Ion Experiment (1)
- Heavy Quark Production (1)
- Heavy flavor production (1)
- Heavy ion collisions (1)
- Heavy ion storage ring (1)
- Heavy ions (1)
- Heavy-flavour decay muons (1)
- Heavy-flavour production (1)
- Hematology (1)
- Hematopoietic stem cell transplantation (1)
- Human behaviour (1)
- Initial state radiation (1)
- Intensive care units (1)
- Intra-abdominal infection (1)
- Invariant Mass Distribution (1)
- Ionisation energy loss (1)
- J/ϕ (1)
- Japan (1)
- Kanada (1)
- Kaonic nuclei (1)
- Laparostomy (1)
- Library screening (1)
- Local thermodynamical equilibrium (1)
- Low & intermediate-energy accelerators (1)
- Low energy QCD (1)
- Luciferase (1)
- Mesh (1)
- Mid-rapidity (1)
- Minimum Bias (1)
- Molecular neuroscience (1)
- Monte Carlo (1)
- Monte-Carlo model for relativistic heavy ion collisions (1)
- Multi-strange baryons (1)
- Multi-wire proportional drift chamber (1)
- Multivariate analysis (1)
- Muon anomaly (1)
- NMR spectroscopy (1)
- Neural network (1)
- Neutropenia (1)
- Nichtgleichgewicht (1)
- Non-equilibrium effects (1)
- Non-operative (1)
- Non-trauma (1)
- Nutrition (1)
- Objectoriented technology (1)
- Objektorientierte Technologie (1)
- Oncology (1)
- Open abdomen (1)
- Orbital electron capture (1)
- Pancreatitis (1)
- Partial wave analysis (1)
- Particle Correlations and Fluctuations (1)
- Particle interactions (1)
- Partikel-Wechselwirkungen (1)
- Pediatric (1)
- Peritonitis (1)
- Personalized medicine (1)
- Phase (1)
- Phosphorylation (1)
- Photon counting (1)
- Pion form factor (1)
- Polarization (1)
- Predictive markers (1)
- Preisstabilität (1)
- Production Cross Section (1)
- Properties of Hadrons (1)
- Proton–proton (1)
- QGP signals (1)
- QMD Modell (1)
- QMD model (1)
- Quark Production (1)
- R value (1)
- Radiation detectors (1)
- Rapidity Range (1)
- Re-exploration (1)
- Reintervention (1)
- Relativistic heavy ion physics (1)
- Relativistic heavy-ion collisions (1)
- Resolution Parameter (1)
- SARS-CoV-2 (1)
- SPS (1)
- Simulation (1)
- Single particle decay spectroscopy (1)
- Small molecules (1)
- Software engineering (1)
- Softwaretechnik (1)
- Spleen (1)
- Statistical model (1)
- Stenotrophomonas maltophilia (1)
- Strong amplitude (1)
- Surgery (1)
- Synthetic (1)
- Systematic Uncertainty (1)
- TR (1)
- Technique (1)
- Time Projection Chamber (1)
- Timing (1)
- Tracking (1)
- Transition radiation detector (1)
- Trigger (1)
- Triple quarkonia (1)
- Two body weak decay (1)
- URQMD (1)
- USA (1)
- Ultra-relativistic Quantum Molecular Dynamics model (1)
- Ultrarelativistic Quantum Molecular Dynamics (1)
- Ultrarelativistic Quantum Molecular Model (1)
- Ultrarelativistisches Quant Molekulares Modell (1)
- UrQMD model (1)
- Vascular emergencies (1)
- Vector Boson Production (1)
- Vesicles (1)
- W-exchange (1)
- WYE-354 (1)
- Xenon-based gas mixture (1)
- Y (4260) (1)
- Zustandsgleichung (1)
- accessory proteins (1)
- agreeableness (1)
- border effects (1)
- branching fractions (1)
- cardiovascular pharmacology (1)
- cell-free protein synthesis (1)
- charmed baryon (1)
- chemokines (1)
- dE/dx (1)
- decay (1)
- decays (1)
- dileptons (1)
- diphoton (1)
- e+e− annihilation (1)
- ectosomes (1)
- energy (1)
- energy-dispersive x-ray spectroscopy (1)
- epilepsy (1)
- equation of state (1)
- executive functions (1)
- exosomes (1)
- extracellular vesicles (1)
- flow (1)
- geldanamycin (1)
- goods market integration (1)
- guidelines (1)
- hadron hadron Kollision (1)
- hadron hadron collision (1)
- heart failure (1)
- heavy ion experiments (1)
- heavy ions (1)
- hotspot loci (1)
- intrinsically disordered region (1)
- lokales thermodynamisches Gleichgewicht (1)
- luminosity (1)
- mTOR inhibitors (1)
- microdeletions (1)
- microparticles (1)
- microvesicles (1)
- minimal information requirements (1)
- neurodevelopment (1)
- neurodevelopmental (1)
- nonstructural proteins (1)
- panel unit root test (1)
- particle ratios (1)
- ppK − (1)
- quantum electrodynamics test (1)
- quark gluon plasma (1)
- rapamycin (1)
- real exchange rate volatility (1)
- real exchange rates (1)
- relativistic (1)
- relativistische (1)
- remodelling (1)
- reproducibility (1)
- rigor (1)
- schwere Ione (1)
- spectra (1)
- standardization (1)
- stationarity (1)
- storage rings (1)
- strangeness (1)
- strong Coulomb field (1)
- structural proteins (1)
- therapy (1)
- thermalization (1)
- working memory (1)
- x-ray techniques (1)
- Λc⁺ (1)
- Σ hyperon (1)
Institute
- Physik (942)
- Frankfurt Institute for Advanced Studies (FIAS) (795)
- Informatik (759)
- Medizin (15)
- Center for Financial Studies (CFS) (6)
- ELEMENTS (4)
- Georg-Speyer-Haus (3)
- Geowissenschaften / Geographie (3)
- Hochschulrechenzentrum (3)
- Informatik und Mathematik (3)
A measurement of the multi-strange Ξ− and Ω− baryons and their antiparticles by the ALICE experiment at the CERN Large Hadron Collider (LHC) is presented for inelastic proton–proton collisions at a centre-of-mass energy of 7 TeV. The transverse momentum (pT) distributions were studied at mid-rapidity (|y|<0.5) in the range of 0.6<pT<8.5 GeV/c for Ξ− and Ξ¯+ baryons, and in the range of 0.8<pT<5 GeV/c for Ω− and Ω¯+. Baryons and antibaryons were measured as separate particles and we find that the baryon to antibaryon ratio of both particle species is consistent with unity over the entire range of the measurement. The statistical precision of the current data has allowed us to measure a difference between the mean pT of Ξ− (Ξ¯+) and Ω− (Ω¯+). Particle yields, mean pT, and the spectra in the intermediate pT range are not well described by the PYTHIA Perugia 2011 tune Monte Carlo event generator, which has been tuned to reproduce the early LHC data. The discrepancy is largest for Ω− (Ω¯+). This PYTHIA tune approaches the pT spectra of Ξ− and Ξ¯+ baryons below pT<0.85 GeV/c and describes the Ξ− and Ξ¯+ spectra above pT>6.0 GeV/c. We also illustrate the difference between the experimental data and model by comparing the corresponding ratios of (Ω−+Ω¯+)/(Ξ−+Ξ¯+) as a function of transverse mass.
The elliptic, v2, triangular, v3, and quadrangular, v4, azimuthal anisotropic flow coefficients are measured for unidentified charged particles, pions, and (anti-)protons in Pb–Pb collisions at √sNN=2.76 TeV with the ALICE detector at the Large Hadron Collider. Results obtained with the event plane and four-particle cumulant methods are reported for the pseudo-rapidity range |η|<0.8 at different collision centralities and as a function of transverse momentum, pT, out to pT=20 GeV/c. The observed non-zero elliptic and triangular flow depends only weakly on transverse momentum for pT>8 GeV/c. The small pT dependence of the difference between elliptic flow results obtained from the event plane and four-particle cumulant methods suggests a common origin of flow fluctuations up to pT=8 GeV/c. The magnitude of the (anti-)proton elliptic and triangular flow is larger than that of pions out to at least pT=8 GeV/c indicating that the particle type dependence persists out to high pT.
The ALICE Collaboration has made the first measurement at the LHC of J/ψ photoproduction in ultra-peripheral Pb–Pb collisions at sNN=2.76 TeV. The J/ψ is identified via its dimuon decay in the forward rapidity region with the muon spectrometer 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 55 μb−1. The cross section for coherent J/ψ production in the rapidity interval −3.6<y<−2.6 is measured to be dσJ/ψcoh/dy=1.00±0.18(stat)−0.26+0.24(syst) mb. The result is compared to theoretical models for coherent J/ψ production and found to be in good agreement with those models which include nuclear gluon shadowing.
Hadronic resonances are used to probe the hadron gas produced in the late stage of heavy-ion collisions since they decay on the same timescale, of the order of 1 to 10 fm/c, as the decoupling time of the system. In the hadron gas, (pseudo)elastic scatterings among the products of resonances that decayed before the kinetic freeze-out and regeneration processes counteract each other, the net effect depending on the resonance lifetime, the duration of the hadronic phase, and the hadronic cross sections at play. In this context, the Σ(1385)± particle is of particular interest as models predict that regeneration dominates over rescattering despite its relatively short lifetime of about 5.5 fm/c. The first measurement of the Σ(1385)± resonance production at midrapidity in Pb-Pb collisions at sNN−−−√=5.02 TeV with the ALICE detector is presented in this Letter. The resonances are reconstructed via their hadronic decay channel, Λπ, as a function of the transverse momentum (pT) and the collision centrality. The results are discussed in comparison with the measured yield of pions and with expectations from the statistical hadronization model as well as commonly employed event generators, including PYTHIA8/Angantyr and EPOS3 coupled to the UrQMD hadronic cascade afterburner. None of the models can describe the data. For Σ(1385)±, a similar behaviour as K∗(892)0 is observed in data unlike the predictions of EPOS3 with afterburner.
A measurement of the transverse momentum spectra of jets in Pb-Pb collisions at sNN−−−√=2.76 TeV is reported. Jets are reconstructed from charged particles using the anti-kT jet algorithm with jet resolution parameters R of 0.2 and 0.3 in pseudo-rapidity |η|<0.5. The transverse momentum pT of charged particles is measured down to 0.15 GeV/c which gives access to the low pT fragments of the jet. Jets found in heavy-ion collisions are corrected event-by-event for average background density and on an inclusive basis (via unfolding) for residual background fluctuations and detector effects. A strong suppression of jet production in central events with respect to peripheral events is observed. The suppression is found to be similar to the suppression of charged hadrons, which suggests that substantial energy is radiated at angles larger than the jet resolution parameter R=0.3 considered in the analysis. The fragmentation bias introduced by selecting jets with a high pT leading particle, which rejects jets with a soft fragmentation pattern, has a similar effect on the jet yield for central and peripheral events. The ratio of jet spectra with R=0.2 and R=0.3 is found to be similar in Pb-Pb and simulated PYTHIA pp events, indicating no strong broadening of the radial jet structure in the reconstructed jets with R<0.3.
The measurement of the production of charm jets, identified by the presence of a D0 meson in the jet constituents, is presented in proton–proton collisions at centre-of-mass energies of √s = 5.02 and 13 TeV with the ALICE detector at the CERN LHC. The D0 mesons were reconstructed from their hadronic decay D0 → K−π+ and the respective charge conjugate. Jets were reconstructed from D0-meson candidates and charged particles using the anti-kT algorithm, in the jet transverse momentum range 5 < pT,chjet < 50 GeV/c, pseudorapidity |ηjet| < 0.9 − R, and with the jet resolution parameters R = 0.2, 0.4, 0.6. The distribution of the jet momentum fraction carried by a D0 meson along the jet axis (z ch) was measured in the range 0.4 < z ch < 1.0 in four ranges of the jet transverse momentum. Comparisons of results for different collision energies and jet resolution parameters are also presented. The measurements are compared to predictions from Monte Carlo event generators based on leading-order and next-to-leading-order perturbative quantum chromodynamics calculations. A generally good description of the main features of the data is obtained in spite of a few discrepancies at low pT,chjet. Measurements were also done for R = 0.3 at √s = 5.02 and are shown along with their comparisons to theoretical predictions in an appendix to this paper.
W±-boson production in p–Pb collisions at √sNN = 8.16 TeV and Pb–Pb collisions at √sNN = 5.02 TeV
(2023)
The production of the W± bosons measured in p−Pb collisions at a centre-of-mass energy per nucleon−nucleon collision sNN−−−−√=8.16 TeV and Pb−Pb collisions at √sNN=5.02 TeV with ALICE at the LHC is presented. The W± bosons are measured via their muonic decay channel, with the muon reconstructed in the pseudorapidity region −4<ημlab<−2.5 with transverse momentum pμT>10 GeV/c. While in Pb−Pb collisions the measurements are performed in the forward (2.5<yμcms<4) rapidity region, in p−Pb collisions, where the centre-of-mass frame is boosted with respect to the laboratory frame, the measurements are performed in the backward (−4.46<yμcms<−2.96) and forward (2.03<yμcms<3.53) rapidity regions. The W− and W+ production cross sections, lepton-charge asymmetry, and nuclear modification factors are evaluated as a function of the muon rapidity. In order to study the production as a function of the p−Pb collision centrality, the production cross sections of the W− and W+ bosons are combined and normalised to the average number of binary nucleon−nucleon collision ⟨Ncoll⟩. In Pb−Pb collisions, the same measurements are presented as a function of the collision centrality. Study of the binary scaling of the W±-boson cross sections in p−Pb and Pb−Pb collisions is also reported. The results are compared with perturbative QCD (pQCD) calculations, with and without nuclear modifications of the Parton Distribution Functions (PDFs), as well as with available data at the LHC. Significant deviations from the theory expectations are found in the two collision systems, indicating that the measurements can provide additional constraints for the determination of nuclear PDF (nPDFs) and in particular of the light-quark distributions.
W±-boson production in p–Pb collisions at √sNN = 8.16 TeV and Pb–Pb collisions at √sNN = 5.02 TeV
(2023)
The production of the W± bosons measured in p–Pb collisions at a centreof-mass energy per nucleon–nucleon collision √sNN = 8.16 TeV and Pb–Pb collisions at √sNN = 5.02 TeV with ALICE at the LHC is presented. The W± bosons are measured via their muonic decay channel, with the muon reconstructed in the pseudorapidity region −4 < ηµ lab < −2.5 with transverse momentum p µ T > 10 GeV/c. While in Pb–Pb collisions the measurements are performed in the forward (2.5 < yµ cms < 4) rapidity region, in p–Pb collisions, where the centre-of-mass frame is boosted with respect to the laboratory frame, the measurements are performed in the backward (−4.46 < yµ cms < −2.96) and forward (2.03 < yµ cms < 3.53) rapidity regions. The W− and W+ production cross sections, leptoncharge asymmetry, and nuclear modification factors are evaluated as a function of the muon rapidity. In order to study the production as a function of the p–Pb collision centrality, the production cross sections of the W− and W+ bosons are combined and normalised to the average number of binary nucleon–nucleon collision hNcolli. In Pb–Pb collisions, the same measurements are presented as a function of the collision centrality. Study of the binary scaling of the W±-boson cross sections in p–Pb and Pb–Pb collisions is also reported. The results are compared with perturbative QCD calculations, with and without nuclear modifications of the Parton Distribution Functions (PDFs), as well as with available data at the LHC. Significant deviations from the theory expectations are found in the two collision systems, indicating that the measurements can provide additional constraints for the determination of nuclear PDFs and in particular of the light-quark distributions.
Polarization of Λ and ¯Λ hyperons along the beam direction in Pb-Pb collisions at √sNN=5.02 TeV
(2022)
The polarization of the Λ and ¯Λ hyperons along the beam (z) direction, Pz, has been measured in Pb-Pb collisions at √sNN=5.02 TeV recorded with ALICE at the Large Hadron Collider (LHC). The main contribution to Pz comes from elliptic flow-induced vorticity and can be characterized by the second Fourier sine coefficient Pz,s2=⟨Pzsin(2φ−2Ψ2)⟩, where φ is thhyperon azimuthal emission angle and Ψ2 is the elliptic flow plane angle. We report the measurement of Pz,s2 for different collision centralities and in the 30%–50% centrality interval as a function of the hyperon transverse momentum and rapidity. The Pz,s2 is positive similarly as measured by the STAR Collaboration in Au-Au collisions at √sNN=200 GeV, with somewhat smaller amplitude in the semicentral collisions. This is the first experimental evidence of a nonzero hyperon Pz in Pb-Pb collisions at the LHC. The comparison of the measured Pz,s2 with the hydrodynamic model calculations shows sensitivity to the competing contributions from thermal and the recently found shear-induced vorticity, as well as to whether the polarization is acquired at the quark-gluon plasma or the hadronic phase.
The first measurement of the e+e− pair production at low lepton pair transverse momentum (pT,ee) and low invariant mass (mee) in non-central Pb−Pb collisions at sNN−−−√=5.02 TeV at the LHC is presented. The dielectron production is studied with the ALICE detector at midrapidity (|ηe|<0.8) as a function of invariant mass (0.4≤mee<2.7 GeV/c2) in the 50−70% and 70−90% centrality classes for pT,ee<0.1 GeV/c, and as a function of pT,ee in three mee intervals in the most peripheral Pb−Pb collisions. Below a pT,ee of 0.1 GeV/c, a clear excess of e+e− pairs is found compared to the expectations from known hadronic sources and predictions of thermal radiation from the medium. The mee excess spectra are reproduced, within uncertainties, by different predictions of the photon−photon production of dielectrons, where the photons originate from the extremely strong electromagnetic fields generated by the highly Lorentz-contracted Pb nuclei. Lowest-order quantum electrodynamic (QED) calculations, as well as a model that takes into account the impact-parameter dependence of the average transverse momentum of the photons, also provide a good description of the pT,ee spectra. The measured ⟨p2T,ee⟩−−−−−√ of the excess pT,ee spectrum in peripheral Pb−Pb collisions is found to be comparable to the values observed previously at RHIC in a similar phase-space region.