Refine
Year of publication
Document Type
- Preprint (815)
- Article (680)
- Conference Proceeding (7)
- Working Paper (2)
- Part of a Book (1)
Has Fulltext
- yes (1505)
Is part of the Bibliography
- no (1505)
Keywords
- Heavy Ion Experiments (22)
- Hadron-Hadron Scattering (14)
- Hadron-Hadron scattering (experiments) (12)
- LHC (10)
- Heavy-ion collision (6)
- Heavy-ion collisions (6)
- Jets (6)
- Heavy Quark Production (5)
- SARS-CoV-2 (5)
- ALICE experiment (4)
- COVID19-NMR (4)
- Collective Flow (4)
- Heavy Ions (4)
- Quark-Gluon Plasma (4)
- Solution NMR spectroscopy (4)
- 5′-UTR (3)
- ALICE (3)
- Diffraction (3)
- Elastic scattering (3)
- Jets and Jet Substructure (3)
- Quarkonium (3)
- meningioma (3)
- neurodegeneration (3)
- pp collisions (3)
- Beam Energy Scan (2)
- Beauty production (2)
- COVID-19 (2)
- Cancer genomics (2)
- Charm physics (2)
- Chiral Magnetic Effect (2)
- Clinical Trials and Observations (2)
- Collectivity (2)
- Correlation (2)
- Elliptic flow (2)
- Experimental nuclear physics (2)
- Experimental particle physics (2)
- Heavy-Ion Collision (2)
- Lepton-Nucleon Scattering (experiments) (2)
- NR4A2 (2)
- PPARγ (2)
- Particle Correlations and Fluctuations (2)
- Particle and resonance production (2)
- Particle correlations and fluctuations (2)
- Pb–Pb collisions (2)
- Polarization (2)
- Pulmonary embolism (2)
- QCD (2)
- Quark Gluon Plasma (2)
- RHIC (2)
- Relativistic heavy-ion collisions (2)
- SFAP (2)
- STAR (2)
- Shear viscosity (2)
- Single electrons (2)
- UAV (2)
- clinically important restrictions and symptoms (2)
- drug discovery (2)
- epilepsy (2)
- fragment screening (2)
- guidelines (2)
- hematopoietic stem cell transplantation (2)
- nuclear receptor (2)
- observational study (2)
- polypharmacology (2)
- rare disease (2)
- soil erosion (2)
- structural biology (2)
- transcription factor (2)
- 140Ce (1)
- 5'-UTR (1)
- 5_SL4 (1)
- 900 GeV (1)
- ABC transporters (1)
- ALICE detector (1)
- ARDS (1)
- ATAD2 (1)
- ATPases (1)
- Advanced biliary tract cancer (1)
- Alzheimer’s disease (1)
- Analysis and statistical methods (1)
- Anti-nuclei (1)
- Antibiotic Resistance (1)
- Antibiotics (1)
- Atherosclerosis (1)
- B-slope (1)
- BET inhibitors (1)
- BRD2 (1)
- BRD4 (1)
- BROMO-10 (1)
- BTC (1)
- Bacillus (1)
- Bacterial pathogens (1)
- Baryonic resonances (1)
- Beam energy scan (1)
- Biochemistry and chemical biology (1)
- Biodiversity (1)
- Biogeography (1)
- Bipolar disorder (1)
- Boosted Jets (1)
- Brain metastasis (1)
- CD74 (1)
- COVID (1)
- Calorimeters (1)
- Cancer (1)
- Cancer genetics (1)
- Canonical suppression (1)
- Cardiomyocyte signaling pathways (1)
- Cardioprotection (1)
- Cardiovascular disease (1)
- Cardiovascular diseases (1)
- Carrier-bound fibrin sealant (1)
- Centrality Class (1)
- Centrality Selection (1)
- Charge fluctuations (1)
- Charged-particle density (1)
- Charged-particle multiplicity (1)
- Charm quark spatial diffusion coefficient (1)
- Charmonia (1)
- Chemical tools (1)
- Chiral magnetic effect (1)
- Circadian (1)
- Circulating MiRNA (1)
- Coalescence (1)
- Cold nuclear matter effects (1)
- Collagen hemostat (1)
- Collective Flow, (1)
- Comorbidities (1)
- Comparison with QCD (1)
- Conformational trapping (1)
- Coronary heart disease (1)
- Covid19-nmr (1)
- Critical care (1)
- Critical point (1)
- DIPSHIFT (1)
- Data management (1)
- Data processing methods (1)
- Data sharing (1)
- Deuteron production (1)
- Di-hadron correlations (1)
- Diagnostic markers (1)
- Direct oral anticoagulation (1)
- Disease Activity (1)
- Drug safety (1)
- Drug screening (1)
- Drug targeting (1)
- E. colo (1)
- Early Rheumatoid Arthritis (1)
- Ecology (1)
- Ecophysiology (1)
- Ecosystems (1)
- Electromagnetic transitions (1)
- Electron-pion identification (1)
- Electroweak interaction (1)
- Endothelial permeability (1)
- Entomology (1)
- Environment (1)
- Experimental models of disease (1)
- Extracellular RNA (eRNA) (1)
- Femtoscopy (1)
- Fibre/foam sandwich radiator (1)
- Flow (1)
- Forschung (1)
- Forward physics (1)
- Freezeout (1)
- G protein-coupled receptor (GPCR) (1)
- G protein-coupled receptors (1)
- GVHD (1)
- Genomic instability (1)
- Germany (1)
- Glioblastoma survival (1)
- Groomed jet radius (1)
- HBT (1)
- HLA class II (1)
- HLA peptidome (1)
- HNO (1)
- Hadron production (1)
- Hadron-Hadron Scattering Heavy (1)
- Hadron-hadron interactions (1)
- Hals-Nasen-Ohren-Heilkunde (1)
- Hand-foot syndrome (1)
- Hard Scattering (1)
- Head and neck cancer (1)
- Health risk analysis (1)
- Heart regeneration (1)
- Heavy Ion Experiment (1)
- Heavy flavor production (1)
- Heavy flavour production (1)
- Heavy ions (1)
- Heavy-flavor decay electron (1)
- Heavy-flavour decay muons (1)
- Heavy-flavour production (1)
- Heavy-ion (1)
- Heavy-ion detectors (1)
- Heavy-ion reactions (1)
- Hemostatics (1)
- HepG2 (1)
- Hif1α (1)
- High-throughput screening (1)
- Higher moments (1)
- HoLEP (1)
- Holmium laser enucleation (1)
- In vitro selection (1)
- Incidental prostate cancer (1)
- Inclusive spectra (1)
- Induced pluripotent stem cells (1)
- Intensity interferometry (1)
- Interference fragmentation function (1)
- Invariant Mass Distribution (1)
- Ionisation energy loss (1)
- Ischemia–reperfusion injury (1)
- Italy (1)
- J/ψ suppression (1)
- Jet Physics (1)
- Jet Substructure (1)
- Jet substructure (1)
- KCGS (1)
- KPS (1)
- LanI Protein (1)
- Lantibiotic (1)
- Lantibiotic Immunity (1)
- Large detector systems for particle and astroparticle physics (1)
- Lehre (1)
- Lipid metabolism (1)
- Lipoprotein (1)
- Liver Fibrosis (1)
- Liver resection (1)
- Low-molecular-weight heparin (1)
- Lymphocytes (1)
- Lymphoid Neoplasia (1)
- Lymphoid tissues (1)
- MACS (1)
- MODY (1)
- Malignant meningioma (1)
- Marine chemistry (1)
- Material budget (1)
- Medicinal chemistry (1)
- Membrane protein (1)
- Meningioma (1)
- Metabolic syndrome (1)
- MiR-29 (1)
- MicroRNAs (miRNAs) (1)
- Microbiome (1)
- Mid-rapidity (1)
- Minimum Bias (1)
- Mitochondria (1)
- Models & methods for nuclear reactions (1)
- Molecular medicine (1)
- Molecular modelling (1)
- Monte Carlo (1)
- Multi-Parton Interactions (1)
- Multi-strange baryons (1)
- Multi-wire proportional drift chamber (1)
- Multiple parton interactions (1)
- Myeloid Neoplasia (1)
- Myocardial infarction (1)
- N-acetylcysteine (1)
- NK cell (1)
- NK cell subset (1)
- NMR (1)
- NMR spectroscopy (1)
- NR4A3 (1)
- Nanobody (1)
- Neolithic (1)
- Neural network (1)
- Neuropilin (1)
- Neutron physics (1)
- Next-generation sequencing (1)
- Nonflow (1)
- Nuclear Magnetic Resonance (1)
- Nuclear modification factor (1)
- Nuclear reactions (1)
- ORL (1)
- Observation (1)
- Oncology (1)
- Orphan nuclear receptor (1)
- Otorhinolaryngology (1)
- Outcome (1)
- Outcomes research (1)
- PCV (1)
- PDGFRβ (1)
- PYTHIA (1)
- Palaeoceanography (1)
- Palaeoclimate (1)
- Parkinson’s disease (1)
- Particle and Resonance Production (1)
- Particle production (1)
- Patterns of care (1)
- Pb–Pb (1)
- Performance of High Energy Physics Detectors (1)
- Periodontitis (1)
- Phage display (1)
- Phylogenomics (1)
- Population genetics (1)
- Preclinical research (1)
- Predictive markers (1)
- Production Cross Section (1)
- Prognostic markers (1)
- Prognostic models (1)
- Properties of Hadrons (1)
- Prostate cancer (1)
- Protein Structure (1)
- Proton-proton collisions (1)
- Proton–proton (1)
- Proton–proton collisions (1)
- Psychiatry (1)
- Pyogenic spondylodiscitis (1)
- QGP (1)
- Quark Deconfinement (1)
- Quark Production (1)
- Quark gluon plasma (1)
- Quark–gluon plasma (1)
- RNA (1)
- RNA genome (1)
- RNASolution-state NMR (1)
- RXRα (1)
- Radiative capture (1)
- Radiotherapy (1)
- Randomized controlled trial (1)
- Rapidity Range (1)
- Relativistic heavy ion physics (1)
- Remote ischemic conditioning (1)
- Research (1)
- Residency (1)
- Resolution Parameter (1)
- Resonance reactions (1)
- Resonances (1)
- Rheumatoid Arthritis (1)
- Ribosome display (1)
- Risk factor (1)
- Routine Medical Care (1)
- Rpo4/7 (1)
- SARS-CoV‑2 pandemic (1)
- SARS-CoV‑2-Pandemie (1)
- SCT (1)
- SKALE score (1)
- SL1 (1)
- SL5a (1)
- SL5b (1)
- SL5b + c (1)
- SL5c (1)
- STAMPE2 (1)
- Salivary gland carcinoma (1)
- Seasonal variation (1)
- Shannon index (1)
- Single muons (1)
- Socio-ecology (1)
- SoftDrop (1)
- Solar insolation (1)
- Sorafenib (1)
- SpaI (1)
- Specialist training (1)
- Spin alignment (1)
- Splitting function (1)
- Ste2p (1)
- Strangeness enhancement (1)
- Stroke (1)
- Structural biology and molecular biophysics (1)
- Subtilin (1)
- Suicide (1)
- Sunlight (1)
- Surgery (1)
- Sweden (1)
- Systematic Uncertainty (1)
- TIRADS (1)
- TR (1)
- TTW nodules (1)
- TUR-P (1)
- Target identification (1)
- Target validation (1)
- Taxonomy (1)
- Teaching (1)
- Teeth (1)
- Therapeutic anticoagulation (1)
- Thermal model (1)
- Thrombosis (1)
- Time Projection Chamber (1)
- Tools and ressources (1)
- Topology (1)
- Tracking (1)
- Transition radiation detector (1)
- Translational research (1)
- Transurethral resection of the prostate (1)
- Transverse momentum (1)
- Transversity (1)
- Treatment (1)
- Trigger (1)
- Tumor infiltrating lymphocytes (1)
- Unemployment (1)
- University hospitals (1)
- Universitätskliniken (1)
- VEGF (1)
- VEGF receptors (1)
- VEGFR-2 (1)
- VEGFR-3 (1)
- Vector Boson Production (1)
- Wealth Losses (1)
- Weiterbildung (1)
- Wide rapidity coverage (1)
- X-ray crystallography (1)
- Xenon-based gas mixture (1)
- Zuckerkandl’s tubercle (1)
- accident (1)
- alleles (1)
- allostery (1)
- anaemia (1)
- androgen receptor (1)
- antibodies (1)
- anticonvulsants (1)
- autism spectrum disorder (1)
- autistic disorder (1)
- azacitidine (1)
- b-cell lymphomas (1)
- bendamustine (1)
- biogeographic legaciese (1)
- biomarker (1)
- bromodomain (1)
- bromodomain inhibitor (1)
- c-kit (1)
- capture (1)
- carbon and proton assignments (1)
- cardiocerebral resuscitation (1)
- cardiopulmonary resuscitation (1)
- castration-resistant prostate cancer (1)
- cell-free expression (1)
- cerium (1)
- charge transfer (1)
- chemogenomic set (1)
- chemotherapy (1)
- chemotherapy regimen (1)
- child (1)
- chimeric antigen receptor t-cell therapy (1)
- chimeric antigen receptors (1)
- chromatin (1)
- cirrhosis (1)
- clinical practice (1)
- cofactor recruitment (1)
- computational chemistry (1)
- copy number polymorphism (1)
- coronavirus (1)
- cross-section (1)
- cryo-EM (1)
- cytotoxicity (1)
- dE/dx (1)
- detector (1)
- dexamethasone (1)
- differential scanning fluorimetry (1)
- diffuse low-grade glioma (1)
- diffusion-weighted magnetic resonance imaging (1)
- domestication (1)
- double access (1)
- drug target (1)
- druggable genome (1)
- dynamics (1)
- ectosomes (1)
- elderly (1)
- epigenetic (1)
- everolimus (1)
- evolution (1)
- exercise (1)
- exosomes (1)
- experimental results (1)
- experiments (1)
- extracellular vesicles (1)
- fluorescence (1)
- follow-up (1)
- forest classification (1)
- forest functional similarity (1)
- fragment-based design (1)
- fragment-based drug design (1)
- freshwater ecosystems (1)
- gastric cancer (1)
- gastrointestinal stromal tumours (1)
- gene flow (1)
- genes (1)
- genetics (1)
- genome (1)
- genotype (1)
- genotype determination (1)
- glioblastoma (1)
- glioblastoma survival (1)
- glioma microenvironment (1)
- global change (1)
- habitat destruction (1)
- health (1)
- health-related quality of life (1)
- health-relatedquality of life (1)
- heavy ion experiments (1)
- heavy-ion collisions (1)
- hepatocyte nuclear factor 4α (1)
- hepatocyte transplantation (1)
- heterodimer (1)
- homodimer (1)
- homogeneous time-resolved FRET (HTRF) (1)
- hotspot loci (1)
- hypoxia (1)
- immune infiltration (1)
- immune reconstitution (1)
- injury (1)
- insect abundance (1)
- juvenile myelomonocytic leukemia (1)
- kinase inhibitor (1)
- land use (1)
- land-use change (1)
- leukapheresis (1)
- leukemia (1)
- lockdown (1)
- long-term research (1)
- lymphoma (1)
- magic angle spinning (1)
- membrane protein (1)
- membrane proteins (1)
- metabolic syndrome (1)
- metastatic renal cell carcinoma (1)
- miRNA (1)
- microdeletions (1)
- microparticles (1)
- microvesicles (1)
- minimal information requirements (1)
- molecular machines (1)
- monitoring (1)
- montelukast (1)
- multiple sclerosis (1)
- multiplexed immunofluorescence (1)
- multiscale (1)
- multitarget drugs (1)
- mutation (1)
- n_TOF (1)
- neoadjuvant chemoradiotherapy (1)
- neurodevelopmental (1)
- neutron (1)
- nuclear magnetic resonance (NMR) (1)
- nuclear receptor related-1 (1)
- nuclear receptor-related 1 (1)
- nucleosynthesis (1)
- object-based classification (1)
- oral cavity cancer (1)
- p+p collisions (1)
- pediatric intensive care (1)
- peritumoral edema (1)
- peritumoral edema zone (1)
- pharmacokinetics (1)
- pharmacophore model (1)
- phase IV (1)
- phenotype (1)
- phenotypic screening (1)
- photochemistry (1)
- photogrammetry (1)
- photolabile protecting groups (1)
- phylogenetic community distance (1)
- phylogeny (1)
- pole concept of goiter growth (1)
- portal hypertension (1)
- posterior horn (1)
- posteroinferior horn (1)
- pranlukast (1)
- predictive biomarker (1)
- primary active transporters (1)
- protein folding (1)
- protein kinase (1)
- pulmonary embolism (1)
- quark gluon plasma (1)
- recurrence pattern (1)
- red blood cells (1)
- remote sensing (1)
- renin-angiotensin system (1)
- reproducibility (1)
- retinoid X receptor (1)
- rigor (1)
- risk of malignancy (1)
- rituximab (1)
- s-process (1)
- sarcoma (1)
- second-line (1)
- secondary chemical shifts (1)
- seizures (1)
- sequence alignment (1)
- signature (1)
- single nucleotide polymorphism (1)
- small molecules (1)
- solid-state NMR (1)
- soluble epoxide hydrolase (1)
- spectra (1)
- speech reports (1)
- ssFLYA (1)
- standardization (1)
- stearic acid (1)
- taller-than-wide (1)
- temozolomide (1)
- tense (1)
- therapeutic anticoagulation (1)
- threats (1)
- transfusion (1)
- trauma (1)
- tropical forests (1)
- type 2 diabetes (1)
- tyrosine kinase inhibitors (1)
- understudied kinase (1)
- zafirlukast (1)
- Υ suppression (1)
- √sN N = 2.76 TeV (1)
Institute
- Physik (1274)
- Frankfurt Institute for Advanced Studies (FIAS) (1144)
- Informatik (1003)
- Medizin (74)
- Biochemie, Chemie und Pharmazie (16)
- Biochemie und Chemie (9)
- Biowissenschaften (9)
- Geowissenschaften (8)
- Zentrum für Biomolekulare Magnetische Resonanz (BMRZ) (7)
- Pharmazie (5)
Preliminary data on phi production in central Pb + Pb collisions at 158 GeV per nucleon are presented, measured by the NA49 experiment in the hadronic decay channel phi - K+K-. At mid-rapidity, the kaons were separated from pions and protons by combining dE/dx and time-of-flight information; in the forward rapidity range only dE/dx identification was used to obtain the rapidity distribution and a rapidity-integrated mt-spectrum. The mid-rapidity yield obtained was dN/dy = 1.85 ± 0.3 per event; the total phi multiplicity was estimated to be 5.0 ± 0.7 per event. Comparison with published pp data shows a slight, but not very significant strangeness enhancement.
Lambda and Antilambda reconstruction in central Pb+Pb collisions using a time projection chamber
(1997)
The large acceptance time projection chambers of the NA49 experiment are used to record the trajectory of charged particles from Pb + Pb collisions at 158 GeV per nucleon. Neutral strange hadrons have been reconstructed from their charged decay products. To obtain distributions of Λ, and Ks0 in discrete bins of rapidity, y, and transverse momentum, pT, calculations have been performed to determine the acceptance of the detector and the efficiency of the reconstruction software as a function of both variables. The lifetime distributions obtained give values of cτ = 7.8 ± 0.6 cm for Λ and cτ = 2.5 ± 0.3 cm for Ks0, consistent with data book values.
Results are presented on event-by-event fluctuations in transverse momentum of charged particles, produced at forward rapidities in p+p, C+C, Si+Si and Pb+Pb collisions at 158 AGeV. Three different characteristics are discussed: the average transverse momentum of the event, the Phi_pT fluctuation measure and two-particle transverse momentum correlations. In the kinematic region explored, the dynamical fluctuations are found to be small. However, a significant system size dependence of Phi_pT is observed, with the largest value measured in peripheral Pb+Pb interactions. The data are compared with predictions of several models. PACS numbers: 14.20.Jn, 13.75.Cs, 12.39.-x
Evidence for an exotic S=-2, Q=-2 baryon resonance in proton-proton collisions at the CERN SPS
(2004)
Results of resonance searches in the Xi - pi -, Xi - pi +, Xi -bar+ pi -, and Xi -bar+ pi + invariant mass spectra in proton-proton collisions at sqrt[s]=17.2 GeV are presented. Evidence is shown for the existence of a narrow Xi - pi - baryon resonance with mass of 1.862±0.002 GeV/c2 and width below the detector resolution of about 0.018 GeV/c2. The significance is estimated to be above 4.2 sigma . This state is a candidate for the hypothetical exotic Xi --3/2 baryon with S=-2, I=3 / 2, and a quark content of (dsdsu-bar). At the same mass, a peak is observed in the Xi - pi + spectrum which is a candidate for the Xi 03/2 member of this isospin quartet with a quark content of (dsusd-bar). The corresponding antibaryon spectra also show enhancements at the same invariant mass.
Observation of an exotic S = -2, Q = -2 baryon resonance in proton-proton collisions at the CERN SPS
(2003)
Results of resonance searches in the Xi- pi-, Xi- pi+, antiXi+ pi- and antiXi+ pi+ invariant mass spectra in proton-proton collisions at sqrt s=17.2 GeV are presented. Evidence is shown for the existence of a narrow Xi- pi- baryon resonance with mass of 1.862+/-0.002 GeV/c^2 and width below the detector resolution of about 0.018 GeV/c^2. The significance is estimated to be 4.0 sigma. This state is a candidate for the hypothetical exotic Xi_(3/2)^-- baryon with S = -2, I = 3/2 and a quark content of (d s d s ubar). At the same mass a peak is observed in the Xi- pi+ spectrum which is a candidate for the Xi_(3/2)^0 member of this isospin quartet with a quark content of (d s u s dbar). The corresponding antibaryon spectra also show enhancements at the same invariant mass.
Report from NA49
(2004)
The most recent data of NA49 on hadron production in nuclear collisions at CERN SPS energies are presented. Anomalies in the energy dependence of pion and kaon production in central Pb+Pb collisions are observed. They suggest that the onset of deconfinement is located at about 30 AGeV. Large multiplicity and transverse momentum fluctuations are measured for collisions of intermediate mass systems at 158 AGeV. The need for a new experimental programme at the CERN SPS is underlined.
A non-monotonic energy dependence of the K + / pi + ratio with a sharp maximum close to 30 A GeV is observed in central Pb+Pb collisions. Within a statistical model of the early stage, this is interpreted as a sign of the phase transition to a QGP, which causes a sharp change in the energy dependence of the strangeness to entropy ratio. This observation naturally motivates us to study the production of multistrange hyperons (Xi, Omega) as a function of the beam energy. Furthermore it was suggested that the kinematic freeze-out of Omega takes place directly at QGP hadronization. If this is indeed the case, the transverse momentum spectra of the Omega directly reflect the transverse expansion velocity of a hadronizing QGP. In this report we show preliminary NA49 results on Omega - and Omega + production in central Pb+Pb collisions at 40 and 158 A GeV and compare them to measurements of Xi - and Xi + production in central Pb+Pb collisions at 30, 40, 80 and 158 A GeV.
Results are presented on event-by-event electric charge fluctuations in central Pb+Pb collisions at 20, 30, 40, 80 and 158 AGeV. The observed fluctuations are close to those expected for a gas of pions correlated by global charge conservation only. These fluctuations are considerably larger than those calculated for an ideal gas of deconfined quarks and gluons. The present measurements do not necessarily exclude reduced fluctuations from a quark-gluon plasma because these might be masked by contributions from resonance decays.
Production of Lambda and Antilambda hyperons was measured in central Pb-Pb collisions at 40, 80, and 158 A GeV beam energy on a fixed target. Transverse mass spectra and rapidity distributions are given for all three energies. The Lambda/pi ratio at mid-rapidity and in full phase space shows a pronounced maximum between the highest AGS and 40 A GeV SPS energies, whereas the anti-Lambda}/pi ratio exhibits a monotonic increase. PACS numbers: 25.75.-q
Particle production in central Pb+Pb collisions was studied with the NA49 large acceptance spectrometer at the CERN SPS at beam energies of 20, 30, 40, 80, and 158 GeV per nucleon. A change of the energy dependence is observed around 30A GeV for the yields of pions and strange particles as well as for the shapes of the transverse mass spectra. At present only a reaction scenario with onset of deconfinement is able to reproduce the measurements.
System size and centrality dependence of the balance function in A + A collisions at √sNN = 17.2 GeV
(2004)
Electric charge correlations were studied for p+p, C+C, Si+Si and centrality selected Pb+Pb collisions at sqrt s_NN = 17.2$ GeV with the NA49 large acceptance detector at the CERN-SPS. In particular, long range pseudo-rapidity correlations of oppositely charged particles were measured using the Balance Function method. The width of the Balance Function decreases with increasing system size and centrality of the reactions. This decrease could be related to an increasing delay of hadronization in central Pb+Pb collisions.
System size dependence of multiplicity fluctuations of charged particles produced in nuclear collisions at 158 A GeV was studied in the NA49 CERN experiment. Results indicate a non-monotonic dependence of the scaled variance of the multiplicity distribution with a maximum for semi-peripheral Pb+Pb interactions with number of projectile participants of about 35. This effect is not observed in a string-hadronic model of nuclear collision HIJING.
Electric charge correlations were studied for p+p, C+C, Si+Si, and centrality selected Pb+Pb collisions at sqrt[sNN]=17.2 GeV with the NA49 large acceptance detector at the CERN SPS. In particular, long-range pseudorapidity correlations of oppositely charged particles were measured using the balance function method. The width of the balance function decreases with increasing system size and centrality of the reactions. This decrease could be related to an increasing delay of hadronization in central Pb+Pb collisions.
Event-by-event fluctuations of particle ratios in central Pb + Pb collisions at 20 to 158 AGeV
(2004)
In the vicinity of the QCD phase transition, critical fluctuations have been predicted to lead to non-statistical fluctuations of particle ratios, depending on the nature of the phase transition. Recent results of the NA49 energy scan program show a sharp maximum of the ratio of K+ to Pi+ yields in central Pb+Pb collisions at beam energies of 20-30 AGeV. This observation has been interpreted as an indication of a phase transition at low SPS energies. We present first results on event-by-event fluctuations of the kaon to pion and proton to pion ratios at beam energies close to this maximum.
System-size dependence of strangeness production in nucleus-nucleus collisions at √sNN = 17.3 GeV
(2005)
Emission of pi, K, phi and Lambda was measured in near-central C+C and Si+Si collisions at 158 AGeV beam energy. Together with earlier data for p+p, S+S and Pb+Pb, the system-size dependence of relative strangeness production in nucleus-nucleus collisions is obtained. Its fast rise and the saturation observed at about 60 participating nucleons can be understood as onset of the formation of coherent partonic subsystems of increasing size. PACS numbers: 25.75.-q
Results are presented on Omega production in central Pb+Pb collisions at 40 and 158 AGeV beam energy. Given are transverse-mass spectra, rapidity distributions, and total yields for the sum Omega+Antiomega at 40 AGeV and for Omega and Antiomega separately at 158 AGeV. The yields are strongly under-predicted by the string-hadronic UrQMD model and are in better agreement with predictions from a hadron gas models. PACS numbers: 25.75.Dw
The hadronic final state of central Pb+Pb collisions at 20, 30, 40, 80, and 158 AGeV has been measured by the CERN NA49 collaboration. The mean transverse mass of pions and kaons at midrapidity stays nearly constant in this energy range, whereas at lower energies, at the AGS, a steep increase with beam energy was measured. Compared to p+p collisions as well as to model calculations, anomalies in the energy dependence of pion and kaon production at lower SPS energies are observed. These findings can be explained, assuming that the energy density reached in central A+A collisions at lower SPS energies is sufficient to transform the hot and dense nuclear matter into a deconfined phase.
The hadronic final state of central Pb+Pb collisions at 20, 30, 40, 80, and 158 AGeV has been measured by the CERN NA49 collaboration. The mean transverse mass of pions and kaons at midrapidity stays nearly constant in this energy range, whereas at lower energies, at the AGS, a steep increase with beam energy was measured. Compared to p+p collisions as well as to model calculations, anomalies in the energy dependence of pion and kaon production at lower SPS energies are observed. These findings can be explained, assuming that the energy density reached in central A+A collisions at lower SPS energies is sufficient to force the hot and dense nuclear matter into a deconfined phase.
Results are presented from a search for the decays D0 -> K min pi plus and D0 bar -> K plus pi min in a sample of 3.8x10^6 central Pb-Pb events collected with a beam energy of 158A GeV by NA49 at the CERN SPS. No signal is observed. An upper limit on D0 production is derived and compared to predictions from several models.