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Calendar of Physics Talks Vienna
| Simulating double soft gluon emission |
| Speaker: | Peter Majcen (University of Vienna) |
| Abstract: | Particle collisions with large momentum transfer and coloured particles can be in principle computed using perturbative QCD.
However in this context it is possible that terms of order $\alpha_s^n L^m$, where $L$ is a large logarithm arise. Such terms originate
from gluon emission where the energy is small in comparison to the large momentum transfer of the process. Non global observables
are sensitive to such emissions. In my talk I will present how such contribution from single and double soft gluon emission could be resummed in a Monte Carlo simulation.
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| Date: | Tue, 22.06.2021 |
| Time: | 16:00 |
| Duration: | 60 min |
| Location: | https://univienna.zoom.us/j/93104933847?pwd=N0FrL0E1UHlkQWRhQTlQODVkZ3kvUT09 Meeting ID: 931 0493 3847 Passcode: 674625 |
| Contact: | A. Hoang, P. Stoffer |
| Sympathetic Cooling of Single Protons (and Antiprotons) |
| Speaker: | Markus Wiesinger (Max Planck Institute for Nuclear Physics, Heidelberg, Germany) |
| Abstract: | Within the BASE collaboration we perform most precise tests of the CPT symmetry in the baryon sector by measurements of the fundamental properties of protons and antiprotons. Our recent 300 ppt measurement of the proton magnetic moment at the proton g-factor experiment in Mainz is predominantly limited by statistics. The reason is that the current use of sub-thermal cooling of a single proton by a resistive method is extremely time-consuming and leads to cycle times of hours.
To overcome this limitation, sympathetic cooling by laser-cooled Be+ ions in a common-end-cap Penning trap is being developed: The method not only promises to produce protons and antiprotons with mK temperatures within tens of seconds but also achieves separation of the cooled and the refrigerator ion.
We present the current setup ... [for full abstract please visit: https://indico.smi.oeaw.ac.at/event/396/] |
| Date: | Wed, 23.06.2021 |
| Time: | 16:30 |
| Duration: | 60 min |
| Location: | Webinar: request zoom link before 12:00 23Jun2021 via email martin.simon at oeaw.ac.at |
| Contact: | Prof. Dr. Eberhard Widmann, Dr. Martin Simon |
| The non-linear stability of the Schwarzschild family of black holes |
| Speaker: | Gustav Holzegel (Imperial, London) |
| Abstract: | Joint Relativity-Geometric Analysis seminar: I will discuss recent work with M. Dafermos, I. Rodnianski and M. Taylor proving the full finite codimension asymptotic stability of the Schwarzschild family of black holes in the exterior of the black hole region. The proof is expressed entirely in physical space and based on our previous understanding of linear stability of the Schwarzschild family in a double null gauge.
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| Date: | Thu, 24.06.2021 |
| Time: | 15:00 |
| Duration: | 60 min |
| Location: | https://univienna.zoom.us/j/6540036841?pwd=SytyVkZJZzNyRG9lMm13ejlHeHRRUT09 |
| Contact: | Piotr Chrusciel, Andy Cap, Roland Donninger, Michael Eichmair |
| Towards Macroscopic Quantum Physics with Levitated Particles |
| Speaker: | Oriol Romero-Isart (Universität Innsbruck) |
| Abstract: | We will discuss the motivation and prospects to explore macroscopic quantum physics with levitated nanoparticles in the context of state-of-the-art experiments. Particular emphasis will be put into the challenges imposed by decoherence. In this context, we will present our recent proposal (arXiv: 2012.12260) to generate large quantum delocalization of a levitated nanoparticle using optimal control and the applications for force sensing and entangling the motion of particles via weak forces. |
| Date: | Fri, 25.06.2021 |
| Time: | 14:00 |
| Duration: | 45 min |
| Location: | Hörsaal ATI /on-line |
| Contact: | Thorsten Schumm |
| C-parameter hadronisation in the symmetric 3-jet limit and the strong coupling |
| Speaker: | Pier Monni (CERN) |
| Abstract: | Hadronisation corrections are crucial in extractions of the strong coupling constant from event-shape distributions at lepton colliders. Although their dynamics cannot be understood rigorously using perturbative methods,their dominant effect on physical observables can be estimated in singular configurations sensitive to the emission of soft radiation.The differential distributions of some event-shape variables,notably the C parameter,feature two such singular points. I will discuss the calculation of the leading non-perturbative correction in the symmetric three-jet limit for this observable,and find that it differs by more than a factor of two from the known result in the two-jet limit.This result is used to estimate the uncertainty due to the description of non-perturbative corrections in strong coupling extractions from experimental data, finding effects of up to 3-4% relative to ... |
| Date: | Fri, 25.06.2021 |
| Time: | 16:00 |
| Duration: | 60 min |
| Location: | https://univienna.zoom.us/j/93104933847?pwd=N0FrL0E1UHlkQWRhQTlQODVkZ3kvUT09 Meeting ID: 931 0493 3847 Passcode: 674625 |
| Contact: | A. Hoang, P. Stoffer |
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