Refine
Year of publication
Document Type
- Preprint (582)
- Article (390)
- Conference Proceeding (3)
- Doctoral Thesis (1)
Has Fulltext
- yes (976)
Is part of the Bibliography
- no (976)
Keywords
- Heavy Ion Experiments (18)
- Hadron-Hadron scattering (experiments) (11)
- BESIII (8)
- Heavy-ion collision (6)
- LHC (6)
- Hadron-Hadron Scattering (4)
- Kollisionen schwerer Ionen (4)
- Quark-Gluon Plasma (4)
- heavy ion collisions (4)
- ALICE experiment (3)
- Branching fractions (3)
- Hadronic decays (3)
- Heavy Ions (3)
- Jets and Jet Substructure (3)
- Quark Gluon Plasma (3)
- Atmospheric science (2)
- Beauty production (2)
- Charm physics (2)
- Charmonium (2)
- Climate change (2)
- Cross section (2)
- Experimental nuclear physics (2)
- Experimental particle physics (2)
- Jets (2)
- Lepton-Nucleon Scattering (experiments) (2)
- Particle and resonance production (2)
- Particle correlations and fluctuations (2)
- Pb–Pb collisions (2)
- QGP (2)
- Quark-Gluon-Plasma (2)
- Single electrons (2)
- UrQMD Modell (2)
- pp collisions (2)
- quark-gluon-plasma (2)
- ADHD (1)
- ALICE (1)
- ALICE detector (1)
- Absolute branching fraction (1)
- Accelerators & Beams (1)
- Accelerators & storage rings (1)
- Acute coronary syndrome (1)
- Angular distribution (1)
- Annihilation (1)
- Anti-nuclei (1)
- Atmospheric chemistry (1)
- Atomic & molecular beams (1)
- Atomic, Molecular & Optical (1)
- Atrial fibrillation (1)
- BNC2 (1)
- BRCA1 (1)
- BRCA2 (1)
- Beam loss (1)
- Bhabha (1)
- Big Five (1)
- Bleeding (1)
- Body mass index (1)
- Branching fraction (1)
- Breast cancer (1)
- CDH13 (1)
- COVID-19 (1)
- Cancer risk factors (1)
- Cancer treatment (1)
- Cardiac troponin (1)
- Centrality Class (1)
- Centrality Selection (1)
- Charge-transfer collisions (1)
- Chemical composition (1)
- Chemotherapy (1)
- Circular accelerators (1)
- Collective Flow (1)
- Colorectal cancer (1)
- Cross section measurements (1)
- Cytomegalie (1)
- Cytomegalovirus Infection (1)
- D meson (1)
- D0 and D+ mesons (1)
- Dalitz decay (1)
- Demolition emissions (1)
- D⁰ meson (1)
- Electromagnetic amplitude (1)
- Electromagnetic form factor (1)
- Electron-pion identification (1)
- Electronic transitions (1)
- Electroweak interaction (1)
- Elliptic flow (1)
- Energie (1)
- Enzyme-linked Immunosorbent Assay (1)
- Exosomes (1)
- Fibre/foam sandwich radiator (1)
- HER2-positive (1)
- Hadron-Hadron Scattering Heavy (1)
- Hadron-hadron interactions (1)
- Hadronic cross section (1)
- Hadrons (1)
- Head and neck Cancer (1)
- Heavy Ion Experiment (1)
- Heavy Quark Production (1)
- Heavy flavor production (1)
- Heavy ion storage ring (1)
- Heavy ions (1)
- Heavy-flavour decay muons (1)
- Heavy-flavour production (1)
- Hereditary breast and ovarian cancer (1)
- Human behaviour (1)
- INR (1)
- Initial state radiation (1)
- International normalized ratio (1)
- Invariant Mass Distribution (1)
- Ionisation energy loss (1)
- LUT (1)
- Lesions (1)
- Low & intermediate-energy accelerators (1)
- Lymphadenopathy (1)
- Lymphomas (1)
- MicroRNAs (1)
- Mid-rapidity (1)
- Minimum Bias (1)
- Molecular neuroscience (1)
- Monte Carlo (1)
- Multi-strange baryons (1)
- Multi-wire proportional drift chamber (1)
- Multivariate analysis (1)
- Muon anomaly (1)
- Myocardial infarction (1)
- NMR spectroscopy (1)
- Neoadjuvant therapy (1)
- Neural network (1)
- Obesity (1)
- Oposterior urethral valve (1)
- Orbital electron capture (1)
- PM10 (1)
- Particle Correlations and Fluctuations (1)
- Pathological complete response (1)
- Personalized medicine (1)
- Phase (1)
- Photon counting (1)
- Pion form factor (1)
- Point-of-care testing (1)
- Polymerase Chain Reaction (1)
- Polymerasekettenreaktion (1)
- Predictive markers (1)
- Production Cross Section (1)
- Properties of Hadrons (1)
- Proton–proton (1)
- Psychiatric disorders (1)
- QCD (1)
- Quark Production (1)
- Quark gluon plasma (1)
- R value (1)
- RNAi (1)
- Rapidity Range (1)
- Relativistic heavy ion physics (1)
- Relativistic heavy-ion collisions (1)
- Resolution Parameter (1)
- SARS-CoV-2 (1)
- SPS (1)
- Salivary gland diseases (1)
- Sensitivity and Specificity (1)
- Sensitivität und Spezifität (1)
- Serodiagnose (1)
- Serodiagnosis (1)
- Single particle decay spectroscopy (1)
- Size distribution (1)
- Strong amplitude (1)
- Structured reporting (1)
- Systematic Uncertainty (1)
- TR (1)
- Time Projection Chamber (1)
- Total colonoscopy (1)
- Toxicity (1)
- Tracking (1)
- Transition radiation detector (1)
- Transplantation/Immunologie (1)
- Transplantation/immunology (1)
- Trigger (1)
- Triple negative (1)
- Triple quarkonia (1)
- Triple-negative breast cancer (1)
- Two body weak decay (1)
- URQMD (1)
- Ultra-relativistic Quantum Molecular Dynamics model (1)
- Ultrafine particles (1)
- Ultrarelativistic Quantum Molecular Dynamics (1)
- Ultrarelativistic Quantum Molecular Model (1)
- Ultrarelativistisches Quant Molekulares Modell (1)
- Ultrasonography (1)
- UrQMD model (1)
- Urban aerosol (1)
- Vector Boson Production (1)
- Viral Matrix Proteins (1)
- Virale Matrixproteine (1)
- W-exchange (1)
- Xenon-based gas mixture (1)
- Y (4260) (1)
- accessory proteins (1)
- adeno-associated virus (1)
- agreeableness (1)
- amino acid PET (1)
- artificial intelligence (1)
- basonuclin 2 (1)
- branching fractions (1)
- cell-free protein synthesis (1)
- charmed baryon (1)
- cloacae (1)
- dE/dx (1)
- decay (1)
- decays (1)
- diphoton (1)
- distal pronephric outlet obstruction (1)
- e+e− annihilation (1)
- energy (1)
- executive functions (1)
- expression studies (1)
- functional genetics (1)
- glioma (1)
- hadron hadron Kollision (1)
- hadron hadron collision (1)
- heavy ion experiments (1)
- heavy ions (1)
- intrinsically disordered region (1)
- lower urinary tract obstruction (1)
- luminosity (1)
- neurodevelopment (1)
- neurodevelopmental disorders (1)
- nonstructural proteins (1)
- pronephric development (1)
- quark gluon plasma (1)
- relativistic (1)
- relativistische (1)
- schwere Ione (1)
- spectra (1)
- structural proteins (1)
- treatment-related changes (1)
- tumor progression (1)
- viral gene transfer (1)
- working memory (1)
- x-ray techniques (1)
- zebrafish (1)
- Λc⁺ (1)
- Σ hyperon (1)
Institute
- Physik (950)
- Frankfurt Institute for Advanced Studies (FIAS) (810)
- Informatik (775)
- Medizin (16)
- Geowissenschaften (4)
- Geowissenschaften / Geographie (3)
- Hochschulrechenzentrum (3)
- Informatik und Mathematik (3)
- ELEMENTS (2)
- Biochemie und Chemie (1)
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.
The inclusive production of the charm-strange baryon Ω0c is measured for the first time via its hadronic decay into Ω−π+ at midrapidity (|y|<0.5) in proton-proton (pp) collisions at the centre-of-mass energy s√=13 TeV with the ALICE detector at the LHC. The transverse momentum (pT) differential cross section multiplied by the branching ratio is presented in the interval 2<pT<12 GeV/c. The pT dependence of the Ω0c-baryon production relative to the prompt D0-meson and to the prompt Ξ0c-baryon production is compared to various models that take different hadronisation mechanisms into consideration. In the measured pT interval, the ratio of the pT-integrated cross sections of Ω0c and prompt Λ+c baryons multiplied by the Ω−π+ branching ratio is found to be larger by a factor of about 20 with a significance of about 4σ when compared to e+e− collisions.
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.
We report about the properties of the underlying event measured with ALICE at the LHC in pp and p−Pb collisions at sNN−−−√=5.02 TeV. The event activity, quantified by charged-particle number and summed-pT densities, is measured as a function of the leading-particle transverse momentum (ptrigT). These quantities are studied in three azimuthal-angle regions relative to the leading particle in the event: toward, away, and transverse. Results are presented for three different pT thresholds (0.15, 0.5, and 1 GeV/c) at mid-pseudorapidity (|η|<0.8). The event activity in the transverse region, which is the most sensitive to the underlying event, exhibits similar behaviour in both pp and p−Pb collisions, namely, a steep increase with ptrigT for low ptrigT, followed by a saturation at ptrigT≈5 GeV/c. The results from pp collisions are compared with existing measurements at other centre-of-mass energies. The quantities in the toward and away regions are also analyzed after the subtraction of the contribution measured in the transverse region. The remaining jet-like particle densities are consistent in pp and p−Pb collisions for ptrigT>10 GeV/c, whereas for lower ptrigT values the event activity is slightly higher in p−Pb than in pp collisions. The measurements are compared with predictions from the PYTHIA 8 and EPOS LHC Monte Carlo event generators.
We report about the properties of the underlying event measured with ALICE at the LHC in pp and p−Pb collisions at sNN−−−√=5.02 TeV. The event activity, quantified by charged-particle number and summed-pT densities, is measured as a function of the leading-particle transverse momentum (ptrigT). These quantities are studied in three azimuthal-angle regions relative to the leading particle in the event: toward, away, and transverse. Results are presented for three different pT thresholds (0.15, 0.5, and 1 GeV/c) at mid-pseudorapidity (|η|<0.8). The event activity in the transverse region, which is the most sensitive to the underlying event, exhibits similar behaviour in both pp and p−Pb collisions, namely, a steep increase with ptrigT for low ptrigT, followed by a saturation at ptrigT≈5 GeV/c. The results from pp collisions are compared with existing measurements at other centre-of-mass energies. The quantities in the toward and away regions are also analyzed after the subtraction of the contribution measured in the transverse region. The remaining jet-like particle densities are consistent in pp and p−Pb collisions for ptrigT>10 GeV/c, whereas for lower ptrigT values the event activity is slightly higher in p−Pb than in pp collisions. The measurements are compared with predictions from the PYTHIA 8 and EPOS LHC Monte Carlo event generators.
Measurements of event-by-event fluctuations of charged-particle multiplicities in Pb–Pb collisions at sNN−−−√ = 2.76 TeV using the ALICE detector at the CERN Large Hadron Collider (LHC) are presented in the pseudorapidity range |η|<0.8 and transverse momentum 0.2<pT<2.0 GeV/c. The amplitude of the fluctuations is expressed in terms of the variance normalized by the mean of the multiplicity distribution. The η and pT dependences of the fluctuations and their evolution with respect to collision centrality are investigated. The multiplicity fluctuations tend to decrease from peripheral to central collisions. The results are compared to those obtained from HIJING and AMPT Monte Carlo event generators as well as to experimental data at lower collision energies. Additionally, the measured multiplicity fluctuations are discussed in the context of the isothermal compressibility of the high-density strongly-interacting system formed in central Pb–Pb collisions.
The behavior of hadronic matter at high baryon densities is studied within Ultrarelativistic Quantum Molecular Dynamics (URQMD). Baryonic stopping is observed for Au+Au collisions from SIS up to SPS energies. The excitation function of flow shows strong sensitivities to the underlying equation of state (EOS), allowing for systematic studies of the EOS. Dilepton spectra are calculated with and without shifting the rho pole. Except for S+Au collisions our calculations reproduce the CERES data.
The behavior of hadronic matter at high baryon densities is studied within Ultrarelativistic Quantum Molecular Dynamics (URQMD). Baryonic stopping is observed for Au+Au collisions from SIS up to SPS energies. The excitation function of flow shows strong sensitivities to the underlying equation of state (EOS), allowing for systematic studies of the EOS. Effects of a density dependent pole of the rho-meson propagator on dilepton spectra are studied for different systems and centralities at CERN energies.
The pT-differential production cross sections of prompt and non-prompt (produced in beauty-hadron decays) D mesons were measured by the ALICE experiment at midrapidity (|y| < 0.5) in proton-proton collisions at s√ = 5.02 TeV. The data sample used in the analysis corresponds to an integrated luminosity of (19.3 ± 0.4) nb−1. D mesons were reconstructed from their decays D0 → K−π+, D+ → K−π+π+, and D+s→φπ+→K−K+π+ and their charge conjugates. Compared to previous measurements in the same rapidity region, the cross sections of prompt D+ and D+s mesons have an extended pT coverage and total uncertainties reduced by a factor ranging from 1.05 to 1.6, depending on pT, allowing for a more precise determination of their pT-integrated cross sections. The results are well described by perturbative QCD calculations. The fragmentation fraction of heavy quarks to strange mesons divided by the one to non-strange mesons, fs/(fu + fd), is compatible for charm and beauty quarks and with previous measurements at different centre-of-mass energies and collision systems. The bb¯¯¯ production cross section per rapidity unit at midrapidity, estimated from non-prompt D-meson measurements, is dσbb¯¯¯/dy∣∣|y|<0.5=34.5±2.4(stat)+4.7−2.9(tot.syst) μb. It is compatible with previous measurements at the same centre-of-mass energy and with the cross section pre- dicted by perturbative QCD calculations.
Higher harmonic non-linear flow modes of charged hadrons in Pb-Pb collisions at √sNN = 5.02 TeV
(2020)
Anisotropic flow coefficients, vn, non-linear flow mode coefficients, χn,mk, and correlations among different symmetry planes, ρn,mk are measured in Pb-Pb collisions at sNN−−−√ = 5.02 TeV. Results obtained with multi-particle correlations are reported for the transverse momentum interval 0.2 < pT < 5.0 GeV/c within the pseudorapidity interval 0.4 < |η| < 0.8 as a function of collision centrality. The vn coefficients and χn,mk and ρn,mk are presented up to the ninth and seventh harmonic order, respectively. Calculations suggest that the correlations measured in different symmetry planes and the non-linear flow mode coefficients are dependent on the shear and bulk viscosity to entropy ratios of the medium created in heavy-ion collisions. The comparison between these measurements and those at lower energies and calculations from hydrodynamic models places strong constraints on the initial conditions and transport properties of the system.