Aktuelle Veranstaltung für 15 Apr 2021
|Prof. Dr. Peter Hommelhoff, Friedrich-Alexander-Universität Erlangen-Nürnberg|
Free electrons are used in a plethora of instruments, ranging from electron microscopes to particle accelerators and modern light sources for decades. Yet, fundamentally new concepts are surfacing, taking advantage of electrons in an entirely new way, mainly based on quantum mechanical and nanophotonics concepts. In this talk, I will show recent results towards interaction-lean imaging with electrons and on-chip control of electrons. These results bring us closer to a quantum electron microscope and to a particle accelerator on a chip.
14:00 Uhr s.t.
Wochenübersicht für die Woche 12 Apr 2021 bis 18 Apr 2021 (KW 15)
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik
12:30 Uhr s.t., usually Staudingerweg 7, Minkowskiraum
|Timo Graffe, Universität Mainz|
Schüler Labor "Climate Escape" (in German)
|at Zoom for now|
Institut für Physik
14:30 Uhr s.t., MITP seminar room
|Raffaele Tito D'Agnolo, IPhT Saclay|
I will discuss settings where the Higgs mass squared affects the vacuum expectation value of local operators and can thus act as a “trigger” of new cosmological dynamics. This triggering mechanism underlies several existing solutions to the hierarchy problem that trace the origin of the weak scale to the early history of the Universe. Thinking about these solutions more systematically from the point of view of weak scale triggers allows to understand their common predictions, to find new solutions and to identify unexpected physics related to naturalness in a rather model-independent way. As an example I discuss a BSM trigger in a Two Higgs Doublet Model and show how it can be used to link the tuning of the Higgs mass to that of the cosmological constant. This weak scale trigger demands the existence of new Higgs states necessarily comparable to or lighter than the weak scale, with no wiggle room to decouple them.
Institut für Kernphysik, Remote Seminar
16:15 Uhr s.t.
|Hartmut Wittig und Martin Fertl, University of Mainz|
The long-persisting discrepancy between the Standard Model prediction of the anomalous magnetic moment of the muon (aµ) and its latest measurement provides an intriguing hint to new physics. Since 2017, the Muon g − 2 Theory Initiative has assessed the theoretical prediction for aµ, focusing on the contributions from the strong interaction, which account for the dominant part of the uncertainty. The latest estimate for the Standard Model prediction, which was published in a recent White Paper, has failed to resolve the discrepancy with the experimental measurement at Brookhaven National Laboratory, which stands at 3.7 standard deviations. At Fermi National Accelerator Laboratory, USA, the Muon g-2 collaboration is performing a new measurement of aµ aiming at an ultimately fourfold smaller uncertainty than achieved with the predecessor experiment. To extract the value of aµ a clock comparison experiment is performed with spin-polarized muons confined in a superbly controlled electric and magnetic field environment. The deviation of the Larmor from the cyclotron frequency, the anomalous spin precession frequency, is determined while a high-precision measurement of the magnetic field environment is performed using nuclear magnetic resonance techniques. We will provide an introduction to the current theory prediction before we will present and discuss the first results of the FNAL experiment from its 2018 science run.
|at Recording of the presentation|
GRK 2516 Soft Matter Seminar
10:30 Uhr s.t.
|Thomas Speck, Johannes Gutenberg University|
TUK and JGU
15:00 Uhr s.t.
|Jörg Wunderlich, Regensburg University|
Magneto-Seebeck microscopy of spin-orbit-torque driven domain wall motion in a collinear antiferromagnet
|at Zoom and SPICE YouTube Channel|
Liste der laufenden Seminare und Kolloquien
|Quantum Sonderseminar||Seminarraum Quantum (02-427)||Prof. Dr. Ferdinand Schmidt-Kaler|
|Technische Wartung: ducbao.ta (klammeraffe) uni-mainz.de|