Technical University of Dortmund

About: Technical University of Dortmund is a education organization based out in Dortmund, Nordrhein-Westfalen, Germany. It is known for research contribution in the topics: Context (language use) & Large Hadron Collider. The organization has 13028 authors who have published 27666 publications receiving 615557 citations. The organization is also known as: Dortmund University & University of Dortmund.

Search for long-lived charginos based on a disappearing-track signature in pp collisions at √s=13 TeV with the ATLAS detector

Abstract: This paper presents a search for direct electroweak gaugino or gluino pair production with a chargino nearly mass-degenerate with a stable neutralino. It is based on an integrated luminosity of 36.1 fb$^{−1}$ of pp collisions at $ \sqrt{s}=13 $ TeV collected by the ATLAS experiment at the LHC. The final state of interest is a disappearing track accompanied by at least one jet with high transverse momentum from initial-state radiation or by four jets from the gluino decay chain. The use of short track segments reconstructed from the innermost tracking layers significantly improves the sensitivity to short chargino lifetimes. The results are found to be consistent with Standard Model predictions. Exclusion limits are set at 95% confidence level on the mass of charginos and gluinos for different chargino lifetimes. For a pure wino with a lifetime of about 0.2 ns, chargino masses up to 460 GeV are excluded. For the strong production channel, gluino masses up to 1.65 TeV are excluded assuming a chargino mass of 460 GeV and lifetime of 0.2 ns.

Modeling of Polar Systems Using PCP-SAFT: An Approach to Account for Induced-Association Interactions†

Abstract: The perturbed-chain polar statistical associating fluid theory (PCP-SAFT) equation of state is applied to mixtures containing polar as well as associating components where cross association may occur. In this work, we focus on mixtures in which at least one of the components does not self-associate but is able to form hydrogen bonds with other compounds, for example, water and alcohols. On the basis of the mixing rules from Wolbach and Sandler 1 for associating components, we propose a simple approach to account for this type of cross association (referred to as induced association) only from the knowledge of pure-component parameters. The application to vapor−liquid and liquid−liquid equilibria of numerous binary and ternary mixtures of polar components with alcohols and/or water revealed the strength of the proposed approach. It is confirmed that accounting for induced-association interactions improves the predictive capability as well as the ability of the model to correlate mixture phase equilibria qu...

Alignment and aggregation effects in suspensions of spheres in non-Newtonian media

Abstract: Photographs are presented which demonstrate the alignment and aggregation effects in suspensions of spheres in viscoelastic media. Pictures were taken from plane shear flows between two glass plates. The spheres line up in flow direction and come into contact. If the spheres touch, the rotation ceases. This alignment and association was also observed and photographed in elongational and in pipe flow.

Exciton-LO-phonon quantum kinetics: Evidence of memory effects in bulk GaAs.

Abstract: Oscillations of the transient four-wave-mixing signal with a period of about $100\mathrm{fs}$ are observed in bulk GaAs using 14 fs pulses tuned to the exciton resonance at low temperatures. The measurements are explained in terms of the non-Markovian quantum kinetics for electron-hole pairs due to LO-phonon scattering. It is shown that the observed oscillations are evidence for memory effects. The experiments provide a first test of the central ideas of quantum kinetics, in which the effects of quantum coherence and of dissipation are intrinsically connected.