Refine
Year of publication
Document Type
- Preprint (707)
- Article (458)
- Conference Proceeding (4)
- Doctoral Thesis (1)
- Working Paper (1)
Has Fulltext
- yes (1171)
Is part of the Bibliography
- no (1171)
Keywords
- Heavy Ion Experiments (21)
- Hadron-Hadron Scattering (14)
- Hadron-Hadron scattering (experiments) (11)
- LHC (10)
- Heavy-ion collision (6)
- Jets (6)
- ALICE experiment (4)
- Collective Flow (4)
- Heavy Ions (4)
- Heavy Quark Production (4)
- Quark-Gluon Plasma (4)
- West Africa (4)
- ALICE (3)
- Burkina Faso (3)
- Jets and Jet Substructure (3)
- pp collisions (3)
- Afrique de l'Ouest (2)
- Beauty production (2)
- Biodiversity (2)
- Charm physics (2)
- Ethnobotany (2)
- Experimental nuclear physics (2)
- Experimental particle physics (2)
- Flora (2)
- Heavy-ion collisions (2)
- Lepton-Nucleon Scattering (experiments) (2)
- Monte Carlo (2)
- Particle Correlations and Fluctuations (2)
- Particle and resonance production (2)
- Particle correlations and fluctuations (2)
- Pb–Pb collisions (2)
- QCD (2)
- Quark Gluon Plasma (2)
- Quarkonium (2)
- Single electrons (2)
- Systematic Uncertainty (2)
- Time Projection Chamber (2)
- Westafrika (2)
- phytodiversity (2)
- 900 GeV (1)
- ALICE LHC (1)
- ALICE detector (1)
- Analysis and statistical methods (1)
- Anteilseigner (1)
- Anti-nuclei (1)
- Apomixis (1)
- Artificial Intelligence (1)
- Atomic and molecular interactions with photons (1)
- BIOfid (1)
- Balance function (1)
- Beobachtungsdaten (1)
- Biodiversity Data (1)
- Biodiversität (1)
- Biomonitoring (1)
- Bodenkrusten (1)
- Boosted Jets (1)
- Botanical Collections (1)
- Botany (1)
- Bürgerwissenschaft (1)
- CVID (1)
- Calorimeters (1)
- Central America (1)
- Centrality Class (1)
- Centrality Selection (1)
- Charge correlations (1)
- Charged-particle density (1)
- Chemical physics (1)
- Chromosome number (1)
- Collective Flow, (1)
- Comparison with QCD (1)
- Complexe WAP (1)
- Conservation (1)
- Corporate Governance (1)
- Data processing methods (1)
- Datenarchivierung (1)
- Digitalfotos (1)
- Digitization (1)
- Distribution (1)
- Economic botany (1)
- Electron-pion identification (1)
- Electronic structure of atoms and molecules (1)
- Electroweak interaction (1)
- Elliptic flow (1)
- European Society for Immunodeficiencies (ESID) (1)
- FOS: Physical sciences (1)
- Femtoscopy (1)
- Fibre/foam sandwich radiator (1)
- Finanzsystem (1)
- Flow cytometry (1)
- Gefäßpflanzen (1)
- German PID-NET registry (1)
- HBT (1)
- Hadron production (1)
- Hadron-Hadron Scattering Heavy (1)
- Hadron-hadron interactions (1)
- Hard Scattering (1)
- Heavy Ion Experiment (1)
- Heavy flavor production (1)
- Heavy flavour production (1)
- Heavy ions (1)
- Heavy-Ion Collision (1)
- Heavy-flavour decay muons (1)
- Heavy-flavour production (1)
- Heavy-ion detectors (1)
- Herbaria (1)
- High Energy Physics - Lattice (hep-lat) (1)
- High Energy Physics - Phenomenology (hep-ph) (1)
- High Energy Physics - Theory (hep-th) (1)
- IgG substitution therapy (1)
- Inclusive spectra (1)
- Intensity interferometry (1)
- Invariant Mass Distribution (1)
- Ionisation energy loss (1)
- Jet Physics (1)
- Jet Substructure (1)
- Large Hadron Collider (1)
- Large detector systems for particle and astroparticle physics (1)
- Material budget (1)
- Medicinal plants (1)
- Mid-rapidity (1)
- Minimum Bias (1)
- Morphological traits (1)
- Multi-Parton Interactions (1)
- Multi-strange baryons (1)
- Multi-wire proportional drift chamber (1)
- Neural network (1)
- Nuclear Theory (nucl-th) (1)
- Nuclear modification factor (1)
- OD approach (1)
- Ontologies (1)
- PID prevalence (1)
- PYTHIA (1)
- Particle and Resonance Production (1)
- Pb–Pb (1)
- Performance of High Energy Physics Detectors (1)
- Phenotype (1)
- Ploidy (1)
- Postglacial colonization (1)
- Production Cross Section (1)
- Properties of Hadrons (1)
- Proton–proton (1)
- Quark Deconfinement (1)
- Quark Production (1)
- Quark gluon plasma (1)
- Ranunculaceae (1)
- Rapidity Range (1)
- Relative importance index (1)
- Relativistic heavy ion physics (1)
- Relativistic heavy-ion collisions (1)
- Relic area (1)
- Research Infrastructure (1)
- Resolution Parameter (1)
- Semantics (1)
- Shareholder (1)
- Single muons (1)
- Specialized Information Service (1)
- Species distribution modelling (1)
- Stakeholder (1)
- Sudanian zone (1)
- TR (1)
- Taxonomy (1)
- Techniques and instrumentation (1)
- Text mining (1)
- Tracking (1)
- Traditional medicine (1)
- Transition radiation detector (1)
- Transverse Momentum (1)
- Transverse momentum (1)
- Trigger (1)
- Universitätsbibliothek Johann Christian Senckenberg (1)
- Unternehmenskontrolle (1)
- Usefulness (1)
- Vallerani-System (1)
- Vector Boson Production (1)
- W National Park (1)
- WAP complex (1)
- WAP-Komplex (1)
- Weideland-Regeneration (1)
- West African plants (1)
- Wide rapidity coverage (1)
- X-ray powder diffraction (1)
- Xenon-based gas mixture (1)
- archivage des données (1)
- atherosclerosis (1)
- bio-ontologies (1)
- biodiversity knowledge base (1)
- cardiac events (1)
- citizen science (1)
- community ecology (1)
- complexity (1)
- coronary calcium (1)
- coronary computed-tomography angiography (CCTA) (1)
- coronary plaques (1)
- dE/dx (1)
- data archiving (1)
- data base tool (1)
- data pruning (1)
- degradation (1)
- denisovite (1)
- desertification (1)
- detector (1)
- digital photos (1)
- disorder (1)
- données d’observation (1)
- données écologiques (1)
- ecological data (1)
- edible plant parts (1)
- electron crystallography (1)
- electron diffraction tomography (1)
- epiphytism (1)
- essbare Pflanzenteile (1)
- essbare Wildpflanzen (1)
- experimental results (1)
- fibrous materials (1)
- flora (1)
- flore (1)
- framework-structured solids (1)
- geomorphology (1)
- geophytes (1)
- grass savanna (1)
- hardpan (1)
- heavy ion experiments (1)
- high throughput (1)
- indicator species (1)
- inorganic materials (1)
- internal transcribed spacer rDNA (1)
- land cover changes (1)
- land degradation (1)
- life-form (1)
- ländlicher Lebensunterhalt (1)
- machine learning (1)
- minerals (1)
- modularity (1)
- moyens de subsistance en milieu rural (1)
- nanocrystalline materials (1)
- nanoscience (1)
- nanostructure (1)
- next-generation sequencing (1)
- observation data (1)
- parties de plantes comestibles (1)
- photos numériques (1)
- plant functional types (1)
- plantes alimentaires sauvages (1)
- plantes vasculaires (1)
- polytypism (1)
- primary immunodeficiency (PID) (1)
- quark gluon plasma (1)
- registry for primary immunodeficiency (1)
- rural livelihoods (1)
- savanna woodland (1)
- science citoyenne (1)
- specialised information service (1)
- species richness (1)
- spectra (1)
- succulents (1)
- systematic diversity (1)
- termitaria (1)
- text mining (1)
- vascular plants (1)
- vegetation cover (1)
- wild food plants (1)
- zonation (1)
- ökologische Daten (1)
- √sN N = 2.76 TeV (1)
Institute
- Physik (1139)
- Frankfurt Institute for Advanced Studies (FIAS) (1043)
- Informatik (1010)
- Senckenbergische Naturforschende Gesellschaft (12)
- Biodiversität und Klima Forschungszentrum (BiK-F) (11)
- Institut für Ökologie, Evolution und Diversität (11)
- Medizin (5)
- Biowissenschaften (4)
- Informatik und Mathematik (3)
- Hochschulrechenzentrum (2)
We present the first measurement of event-by-event fluctuations in the kaon sector in Pb – Pb collisions at √sNN = 2.76 TeV with the ALICE detector at the LHC. The robust fluctuation correlator νdyn is used to evaluate the magnitude of fluctuations of the relative yields of neutral and charged kaons, as well as the relative yields of charged kaons, as a function of collision centrality and selected kinematic ranges. While the correlator νdyn[K+,K−] exhibits a scaling approximately in inverse proportion of the charged particle multiplicity, νdyn[K0 S ,K±] features a significant deviation from such scaling. Within uncertainties, the value of νdyn[K0 S ,K±] is independent of the selected transverse momentum interval, while it exhibits a pseudorapidity dependence. The results are compared with HIJING, AMPT and EPOS–LHC predictions, and are further discussed in the context of the possible production of disoriented chiral condensates in central Pb – Pb collisions.
In particle collider experiments, elementary particle interactions with large momentum transfer produce quarks and gluons (known as partons) whose evolution is governed by the strong force, as described by the theory of quantum chromodynamics (QCD)1. These partons subsequently emit further partons in a process that can be described as a parton shower2, which culminates in the formation of detectable hadrons. Studying the pattern of the parton shower is one of the key experimental tools for testing QCD. This pattern is expected to depend on the mass of the initiating parton, through a phenomenon known as the dead-cone effect, which predicts a suppression of the gluon spectrum emitted by a heavy quark of mass mQ and energy E, within a cone of angular size mQ/E around the emitter3. Previously, a direct observation of the dead-cone effect in QCD had not been possible, owing to the challenge of reconstructing the cascading quarks and gluons from the experimentally accessible hadrons. We report the direct observation of the QCD dead cone by using new iterative declustering techniques4,5 to reconstruct the parton shower of charm quarks. This result confirms a fundamental feature of QCD. Furthermore, the measurement of a dead-cone angle constitutes a direct experimental observation of the non-zero mass of the charm quark, which is a fundamental constant in the standard model of particle physics.
The production of J/ψ is measured as a function of charged-particle multiplicity at forward rapidity in proton-proton (pp) collisions at center-of-mass energies s√ = 5.02 and 13 TeV. The J/ψ mesons are reconstructed via their decay into dimuons in the rapidity interval (2.5 < y < 4.0), whereas the charged-particle multiplicity density (dNch/dη) is measured at midrapidity (|η| < 1). The production rate as a function of multiplicity is reported as the ratio of the yield in a given multiplicity interval to the multiplicity-integrated one. This observable shows a linear increase with charged-particle multiplicity normalized to the corresponding average value for inelastic events (dNch/dη/〈dNch/dη〉), at both the colliding energies. Measurements are compared with available ALICE results at midrapidity and theoretical model calculations. First measurement of the mean transverse momentum (〈pT〉) of J/ψ in pp collisions exhibits an increasing trend as a function of dNch/dη/〈dNch/dη〉 showing a saturation towards high charged-particle multiplicities.
J/ψ production as a function of charged-particle multiplicity in p-Pb collisions at √sNN = 8.16 TeV
(2020)
Inclusive J/ψ yields and average transverse momenta in p-Pb collisions at a center-of-mass energy per nucleon pair s NN $$ \sqrt{s_{\mathrm{NN}}} $$ = 8.16 TeV are measured as a function of the charged-particle pseudorapidity density with ALICE. The J/ψ mesons are reconstructed at forward (2.03 < y cms < 3.53) and backward (−4.46 < y cms < −2.96) center-of-mass rapidity in their dimuon decay channel while the charged-particle pseudorapidity density is measured around midrapidity. The J/ψ yields at forward and backward rapidity normalized to their respective average values increase with the normalized charged-particle pseudorapidity density, the former showing a weaker increase than the latter. The normalized average transverse momenta at forward and backward rapidity manifest a steady increase from low to high charged-particle pseudorapidity density with a saturation beyond the average value.
The multiplicity dependence of jet production in pp collisions at the centre-of-mass energy of s√=13 TeV is studied for the first time. Jets are reconstructed from charged particles using the anti-kT algorithm with resolution parameters R varying from 0.2 to 0.7. The jets are measured in the pseudorapidity range |ηjet|<0.9−R and in the transverse momentum range 5<pchT,jet<140 GeV/c. The multiplicity intervals are categorised by the ALICE forward detector V0. The pT differential cross section of charged-particle jets are compared to leading order (LO) and next-to-leading order (NLO) perturbative quantum chromodynamics (pQCD) calculations. It is found that the data are better described by the NLO calculation, although the NLO prediction overestimates the jet cross section below 20 GeV/c. The cross section ratios for different R are also measured and compared to model calculations. These measurements provide insights into the angular dependence of jet fragmentation. The jet yield increases with increasing self-normalised charged-particle multiplicity. This increase shows only a weak dependence on jet transverse momentum and resolution parameter at the highest multiplicity. While such behaviour is qualitatively described by the present version of PYTHIA, quantitative description may require implementing new mechanisms for multi-particle production in hadronic collisions.
The energy deposited at very forward rapidities (very forward energy) is a powerful tool for characterising proton fragmentation in pp and p-Pb collisions. The correlation of very forward energy with particle production at midrapidity provides direct insights into the initial stages and the subsequent evolution of the collision. Furthermore, the correlation with the production of particles with large transverse momenta at midrapidity provides information complementary to the measurements of the underlying event, which are usually interpreted in the framework of models implementing centrality-dependent multiple parton interactions.
Results about very forward energy, measured by the ALICE zero degree calorimeters (ZDCs), and its dependence on the activity measured at midrapidity in pp collisions at s√ = 13 TeV and in p-Pb collisions at sNN−−−√ = 8.16 TeV are discussed. The measurements performed in pp collisions are compared with the expectations of three hadronic interaction event generators: PYTHIA 6 (Perugia 2011 tune), PYTHIA 8 (Monash tune), and EPOS LHC. These results provide new constraints on the validity of models in describing the beam remnants at very forward rapidities, where perturbative QCD cannot be used.
Understanding the production mechanism of light (anti)nuclei is one of the key challenges of nuclear physics and has important consequences for astrophysics, since it provides an input for indirect dark-matter searches in space. In this paper, the latest results about the production of light (anti)nuclei in pp collisions at s√ = 13 TeV are presented, focusing on the comparison with the predictions of coalescence and thermal models. For the first time, the coalescence parameters B2 for deuterons and B3 for helions are compared with parameter-free theoretical predictions that are directly constrained by the femtoscopic measurement of the source radius in the same event class. A fair description of the data with a Gaussian wave function is observed for both deuteron and helion, supporting the coalescence mechanism for the production of light (anti)nuclei in pp collisions. This method paves the way for future investigations of the internal structure of more complex nuclear clusters, including the hypertriton.
Two-particle Azimuthal correlations are measured with the ALICE apparatus in pp collisions at s√=13 TeV to explore strangeness- and multiplicity-related effects in the fragmentation of jets and the transition regime between bulk and hard production, probed with the condition that a strange meson (KS0) or baryon (Λ) with transverse momentum pT>3 GeV/c is produced. Azimuthal correlations between kaons or Λ hyperons with other hadrons are presented at midrapidity for a broad range of the trigger (3<ptriggT<20 GeV/c) and associated particle pT (1 GeV/c <passocT<ptriggT), for minimum-bias events and as a function of the event multiplicity. The near- and away-side peak yields are compared for the case of either KS0 or Λ(Λ¯¯¯¯) being the trigger particle with that of inclusive hadrons (a sample dominated by pions). In addition, the measurements are compared with predictions from PYTHIA 8 and EPOS LHC event generators.
Femtoscopic correlations with the particle pair combinations K0 SK0 S and K0 SK± are studied in pp collisions at √s = 5.02 and 13 TeV by the ALICE experiment. At both energies, boson source parameters are extracted for both pair combinations, by fitting models based on Gaussian size distributions of the sources, to the measured two-particle correlation functions. The interaction model used for the K0 SK0 S analysis includes quantum statistics and strong final-state interactions through the f0(980) and a0(980) resonances. The model used for the K0 SK± analysis includes only the final-state interaction through the a0 resonance. Source parameters extracted in the present work are compared with published values from pp collisions at √s = 7 TeV and the different pair combinations are found to be consistent. From the observation that the strength of the K0 SK0 S correlations is significantly greater than the strength of the K0 SK± correlations, the new results are compatible with the a0 resonance being a tetraquark state of the form (q1, q2, s, s), where q1 and q2 are u or d quarks.
First measurements of balance functions (BFs) of all combinations of identified charged hadron (π,K, p) pairs in Pb–Pb collisions at √sNN = 2.76 TeV recorded by the ALICE detector are presented. The BF measurements are carried out as two-dimensional differential correlators versus the relative rapidity (Δy) and azimuthal angle (Δφ) of hadron pairs, and studied as a function of collision centrality. The Δφ dependence of BFs is expected to be sensitive to the light quark diffusivity in the quark–gluon plasma. While the BF azimuthal widths of all pairs substantially decrease from peripheral to central collisions, the longitudinal widths exhibit mixed behaviors: BFs of ππ and cross-species pairs narrow significantly in more central collisions, whereas those of KK and pp are found to be independent of collision centrality. This dichotomy is qualitatively consistent with the presence of strong radial flow effects and the existence of two stages of quark production in relativistic heavy-ion collisions. Finally, the first measurements of the collision centrality evolution of BF integrals are presented, with the observation that charge balancing fractions are nearly independent of collision centrality in Pb–Pb collisions. Overall, the results presented provide new and challenging constraints for theoretical models of hadron production and transport in relativistic heavy-ion collisions.