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Calendar of Physics Talks Vienna
| Anomalous and axial Z' contributions to g-2 |
| Speaker: | Pascal Anastasopoulos (HEPHY) |
| Abstract: | In this talk, we will study the effects of an anomalous Z' boson on the anomalous magnetic moment of the muon (g-2), and especially the impact of its axial coupling.
We mainly evaluate the negative contribution to (g-2) of such couplings at one-loop and look at the anomalous couplings generated at two loops.
We find areas of the parameter space, where the anomalous contribution becomes comparable and even dominant compared to the one-loop contribution.
We show that in such cases, the cutoff of the theory is sufficiently low, so that new charged fermions can be found in the next round of collider experiments.
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| Date: | Tue, 17.01.2023 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Sem.R. DB gelb 03 (Freihaus, TU Wien, Wiedner Hauptstrasse 8) |
| Contact: | S. Fredenhagen, D. Grumiller, E. Battista, R. Ruzziconi |
| Towards identifying the charge carriers in tribocharging |
| Speaker: | Markus Felber (TU Wien, Institut für Angewandte Physik) |
| Abstract: | If two electrically neutral materials are brought into contact, an exchange of charge can occur. This effect is called tribocharging and has been known for over 2500 years, yet it is still poorly understood. Perhaps the most important unresolved issue is the unknown identity of the charge-carrier itself. While it is often assumed that the carriers are electrons, they could also be ions, and different experiments in different circumstances provide suggestive evidence for both cases. In order to address this fundamental issue, an experiment whose aim is to clearly identify the carrier responsible for tribocharging is being built. For this, tribocharging experiments with insulating samples in vacuum are being carried out. After contact and charge exchange, we heat one sample near the entrance to a single-charge sensitive quadrupole mass spectrometer (QMS), which can measure ionic charges le |
| Date: | Tue, 17.01.2023 |
| Time: | 16:00 |
| Location: | TU Wien, Institut für Angewandte Physik, E134 1040 Wien, Wiedner HauptstraÃe 8-10 Yellow Tower âBâ, 5th floor, SEM.R. DB gelb 05 B |
| Contact: | Univ.Prof. Dr. M. Valtiner |
| Precision Standard Model Phenomenology at N3LO and beyond |
| Speaker: | Gherardo Vita (MIT) |
| Abstract: | Collider experiments will achieve percent level precision measurements of several processes key to answer some of the most pressing questions of contemporary particle physics. In this talk I will show that the capability to predict and describe such observables at next-to-next-to-next-to-leading order (N3LO) in QCD perturbation theory is crucial to fully exploit these experimental measurements. I will describe how to compute differential distributions via EFT-based subtraction methods and illustrate the calculation of the N3LO TMD and N-jettiness beam functions.These constitute the last missing ingredients for extending these techniques to N3LO for processes such as Higgs production in gluon fusion and Drell-Yan and a key element for the application
of these techniques toprocesseswith jets in the final state at this order. |
| Date: | Tue, 17.01.2023 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultaet fuer Physik, Erwin Schroedinger-HS, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, M. Procura, A. Broggio |
| Towards Driving Quantum Systems with the Nonradiating Near-Field of a Modulated Electron Beam |
| Speaker: | Matthias Kolb (TU Wien, Atominstitut) |
| Abstract: | When manipulating quantum systems with electromagnetic radiation, the spatial resolution is usually constrained by the diffraction limit. To overcome this limitation, we have developed a fundamentally new approach, in which we attempt to coherently transmit electromagnetic excitation through the nonradiating near-field of a modulated electron beam. This could open a path to spectrally selective quantum control with nanoscale spatial resolution by exploiting the small de Broglie wavelength of electrons. In a proof of principle experiment we will use a spatially modulated electron beam generated by a fast cathode ray tube from an analog oscilloscope to coherently drive the hyperfine levels of potassium [1]. To also show coherent manipulation of a solid state quantum system, we are currently striving to perform Electron Spin Resonance with a BDPA sample. In this experimental realization a m |
| Date: | Wed, 18.01.2023 |
| Time: | 16:15 |
| Duration: | 45 min |
| Location: | Hörsaal ATI |
| Contact: | Maximilian Prüfer |
| Instability of a massless scalar field confined in a perfectly reflecting spherical cavity |
| Speaker: | M. Maliborski (Vienna) |
| Abstract: | I will discuss a spherically symmetric gravitating model that exhibits turbulent dynamics, conjectured to be the core mechanism of instability of the anti-de Sitter solution.
Using the resonant approximation, I will provide evidence that generic arbitrarily small initial perturbations of amplitude epsilon lead to a black hole formation on the timescale 1/epsilon^2.
Furthermore, I will argue that the perturbative approximation remains valid up to apparent horizon formation. |
| Date: | Thu, 19.01.2023 |
| Time: | 15:15 |
| Duration: | 60 min |
| Location: | Seminarraum A, Waehringer Strasse 17, 2. Stock |
| Contact: | P. Chrusciel, D. Fajman |
| Algebra of symmetry in BF-like models and observables |
| Speaker: | Christophe Goeller (Ludwig-Maximilians University Munich) |
| Abstract: | In this talk, I will discuss the construction of the boundary symmetry algebra for BF-like theories in 3D and 4D. In the 3D case, the theory corresponds to (an extension of) 3D gravity allowing for a source of curvature and torsion. I will show how the study of the current algebra and its associated Sugawara construction allows for two notions of quadratic charges (the usual diffeomorphism and its "dual") independently of boundary conditions. I will discuss their resulting algebra and its relation with the usual construction of the asymptotic boundary algebra. In the 4D case, a similar yet fundamentally different construction is possible, similarly resulting in multiple quadratic charges. I will discuss their constructions and their possible relations to 4D gravity. |
| Date: | Thu, 19.01.2023 |
| Time: | 17:00 |
| Duration: | 60 min |
| Location: | Freihaus, Sem.R. DB gelb 10 |
| Contact: | Romain Ruzziconi, Daniel Grumiller, Iva Lovrekovic |
| Quantum sensing with entangled atoms and mechanical pendulums |
| Speaker: | Onur Hosten (IST Austria) |
| Abstract: | Advances in the level of precision in controlling atomic and optical systems have enabled the routine generation of entangled states for sensing applications. In the first part of the talk I will
focus on a particular set of entangled states called spin squeezed states, and focus on our implementations in a cavity QED system. These include 20 dB spin squeezing for atomic clock applications and the concept of quantum phase magnification. I will then present the status of our efforts for developing a squeezed state-atom interferometer.
For a brief interlude I will advertise a new worthwhile method â squash locking â that we developed for laser-cavity frequency stabilization and for stabilization of laser injection locking.
In the second part of the talk I will outline our new thrust for developing a hybrid system of atoms and mechanical oscillators in the form of torsional pendulums |
| Date: | Fri, 20.01.2023 |
| Time: | 10:00 |
| Duration: | 45 min |
| Location: | ATI HÃÂörsaal/https://tuwien.zoom.us/j/93672218922?pwd=dEZNQ2liVzRNNURvNmVWVE5KUWRiQT09 |
| Contact: | Julian Leonard |
| Sub-Leading and Super-Leading Logarithms in Jet Processes |
| Speaker: | Thomas Becher (Albert Einstein Center for Fundamental Physics, University of Bern) |
| Abstract: | Jet cross sections at high-energy colliders exhibit intricate patterns of logarithmically enhanced higher-order corrections.
In particular, so-called non-global logarithms emerge from soft radiation emitted off energetic partons inside jets.
While this is a single-logarithmic effect at lepton colliders, at hadron colliders phase factors in the amplitudes lead to
double-logarithmic corrections starting at four-loop order.
In my talk Iâll first explain the resummation of non-global logarithms at lepton colliders, where techniques for the resummation of sub-leading logarithms are now available.
Iâll then explain the origin of the ``super-leadingââ double logarithms at hadron colliders and discuss their resummation. |
| Date: | Fri, 20.01.2023 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultaet fuer Physik, Erwin Schroedinger-HS, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, M. Procura, A. Broggio |
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