Refine
Year of publication
Document Type
- Preprint (666)
- Article (378)
- Review (2)
- Conference Proceeding (1)
Has Fulltext
- yes (1047)
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)
- Deutsch (4)
- Jets (4)
- Quark-Gluon Plasma (4)
Institute
- Physik (1036)
- Frankfurt Institute for Advanced Studies (FIAS) (960)
- Informatik (920)
- Medizin (5)
- Informatik und Mathematik (3)
- Hochschulrechenzentrum (2)
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 ALICE Zero Degree Calorimeter system (ZDC) is composed of two identical sets of calorimeters, placed at opposite sides with respect to the interaction point, 114 meters away from it, complemented by two small forward electromagnetic calorimeters (ZEM). Each set of detectors consists of a neutron (ZN) and a proton (ZP) ZDC. They are placed at zero degrees with respect to the LHC axis and allow to detect particles emitted close to beam direction, in particular neutrons and protons emerging from hadronic heavy-ion collisions (spectator nucleons) and those emitted from electromagnetic processes. For neutrons emitted by these two processes, the ZN calorimeters have nearly 100% acceptance.
During the √sNN = 2.76 TeV Pb-Pb data-taking, the ALICE Collaboration studied forward neutron emission with a dedicated trigger, requiring a minimum energy deposition in at least one of the two ZN. By exploiting also the information of the two ZEM calorimeters it has been possible to separate the contributions of electromagnetic and hadronic processes and to study single neutron vs. multiple neutron emission.
The measured cross sections of single and mutual electromagnetic dissociation of Pb nuclei at √sNN = 2.76 TeV, with neutron emission, are σsingle EMD = 187:4 ± 0.2 (stat.)−11.2+13.2 (syst.) b and σmutual EMD = 5.7 ± 0.1 (stat.) ±0.4 (syst.) b, respectively [1]. This is the first measurement of electromagnetic dissociation of 208Pb nuclei at the LHC energies, allowing a test of electromagnetic dissociation theory in a new energy regime. The experimental results are compared to the predictions from a relativistic electromagnetic dissociation model.
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.
Long-range angular correlations on the near and away side in p–Pb collisions at √sNN=5.02 TeV
(2013)
Angular correlations between charged trigger and associated particles are measured by the ALICE detector in p–Pb collisions at a nucleon–nucleon centre-of-mass energy of 5.02 TeV for transverse momentum ranges within 0.5<pT,assoc<pT,trig<4 GeV/c. The correlations are measured over two units of pseudorapidity and full azimuthal angle in different intervals of event multiplicity, and expressed as associated yield per trigger particle. Two long-range ridge-like structures, one on the near side and one on the away side, are observed when the per-trigger yield obtained in low-multiplicity events is subtracted from the one in high-multiplicity events. The excess on the near-side is qualitatively similar to that recently reported by the CMS Collaboration, while the excess on the away-side is reported for the first time. The two-ridge structure projected onto azimuthal angle is quantified with the second and third Fourier coefficients as well as by near-side and away-side yields and widths. The yields on the near side and on the away side are equal within the uncertainties for all studied event multiplicity and pT bins, and the widths show no significant evolution with event multiplicity or pT. These findings suggest that the near-side ridge is accompanied by an essentially identical away-side ridge.
Die Textsortenlinguistik steht seit Längerem wieder stärker im Fokus der sprachwissenschaftlichen Forschung. Ein intensiveres Einbeziehen der Textsorten in den Sprachunterricht wird jedoch als ein zentrales Desiderat dargestellt. Der vorliegende Beitrag ist der empirisch-induktiven Richtung in der Textsortenlinguistik zuzuordnen, deren Ziel es ist, ausgehend von einer umfassenden Analyse und einer detaillierten Beschreibung konkreter Textsorten einzelsprachspezifische Routinen aufzudecken. Der Beitrag möchte außerdem fremdsprachendidaktische Zielsetzungen in den Vordergrund stellen und das Potenzial einer ausgewählten Textsorte für die Arbeit mit und an Texten im schulischen DaF-Unterricht aufzeigen. Zum einen wird der Frage nachgegangen, wie man solche Texte in die Grammatik- und Wortschatzvermittlung einbeziehen kann, indem man sprachliche Mittel (grammatische wie lexikalische) in Funktion für die Lernenden sichtbar macht. Zum anderen wird erforscht, wie die hier im Fokus stehende Textsorte für die Entwicklung der rezeptiven sowie produktiven Fertigkeiten genutzt werden kann.
Zum Informationsangebot deutscher Aussprachewörterbücher für tschechische Germanistikstudierende
(2013)
Aussprachewörterbücher stellen für nichtmuttersprachliche Germanistikstudierende nach wie vor eine der wichtigsten Informationsquellen über die gesprochene Form der deutschen Gegenwartssprache dar. Beim Vergleich der gängigen Aussprachewörterbücher des Deutschen kann man jedoch gravierende Unterschiede feststellen, die einen Nichtmuttersprachler leicht zu desorientieren (wenn nicht gerade zu verwirren) vermögen. Im Beitrag werden die zwei gebräuchlichsten Aussprachewörterbücher der deutschen Sprache (DUDEN Das Aussprachewörterbuch und De Gruyter Deutsches Aussprachewörterbuch) im Hinblick auf das darin enthaltene Informationsangebot für tschechische Germanistikstudierende verglichen. In den Vordergrund tritt somit die Darstellung der für tschechische Deutschstudierende problematischen phonetischen Erscheinungen. Des Weiteren wird folgenden Aspekten Aufmerksamkeit geschenkt: konzeptionelle Ausgangspunkte, Umfang und Stichwörterauswahl, theoretische Beschreibung des phonetisch-phonologischen Systems des Deutschen sowie der deutschen Standardlautung, Aktualitätsbezug, Beschreibung von regionalen Varietäten, Berücksichtigung der Phonostilistik usw.
In diesem Artikel wird auf die lückenhafte lexikografische Darbietung von paradigmatisch-syntagmatischen Beziehungen hingewiesen und auf neue, korpusgestützte methodologische Verfahren der lexikosemantischen Analyse eingegangen. Im Mittelpunkt steht das am Mannheimer Institut für Deutsche Sprache entwickelte topografische Modell CNS (Contrasting Near Synonyms), dessen Beitrag für die Erforschung der Synonymie am Beispiel deutscher Adjektive "fühlbar" vs. "spürbar" präsentiert wird.
Despite the recent availability of vaccines against severe acute respiratory syndrome coronavirus type 2 (SARS-CoV-2), there is an urgent need for specific anti-SARS-CoV-2 drugs. Monoclonal neutralizing antibodies are an important drug class in the global fight against the SARS-CoV-2 pandemic due to their ability to convey immediate protection and their potential to be used as both prophylactic and therapeutic drugs. Clinically used neutralizing antibodies against respiratory viruses are currently injected intravenously, which can lead to suboptimal pulmonary bioavailability and thus to a lower effectiveness. Here we describe DZIF-10c, a fully human monoclonal neutralizing antibody that binds the receptor-binding domain of the SARS-CoV-2 spike protein. DZIF-10c displays an exceptionally high neutralizing potency against SARS-CoV-2, retains full activity against the variant of concern (VOC) B.1.1.7 and still neutralizes the VOC B.1.351, although with reduced potency. Importantly, not only systemic but also intranasal application of DZIF-10c abolished the presence of infectious particles in the lungs of SARS-CoV-2 infected mice and mitigated lung pathology when administered prophylactically. Along with a favorable pharmacokinetic profile, these results highlight DZIF-10c as a novel human SARS-CoV-2 neutralizing antibody with high in vitro and in vivo antiviral potency. The successful intranasal application of DZIF-10c paves the way for clinical trials investigating topical delivery of anti-SARS-CoV-2 antibodies.