Fakultät für Physik und Astronomie

Physikalisches Kolloquium

Freitag, 3. Juli 2026 17:00 Uhr Towards a complete QCD map of hadron interactions

Prof. Dr. Laura Fabbietti, Technische Universität München Towards a complete QCD map of hadron interactions Prof. Dr. Laura Fabbietti Technische Universität München A new technique has been developed in recent years at the LHC to study the residual strong interaction among hadrons: femtoscopy for interactions. This technique leverages the high statistics pp collision data recorded at the LHC and the exquisite particle identification capabilities of the ALICE detector. In this talk we will discuss how femtoscopy for interactions allowed us to extract for the first time the scattering parameters of hadron pairs containing (nearly) any combination of u, d, s and c quarks, how the technique was extended to three-hadron systems with the goal of testing the sensitivity to nuclear three-body forces and how the very same method recently allowed us to directly observe the creation mechanism of anti-nuclei at the LHC. Femtoscopy for interactions opened a new research field at the LHC and its future perspectives will be presented.

Teilchenkolloquium

Overview of hypernuclei measurements at the LHC

Dr. Francesco Mazzaschi, CERN/ Genf

Astronomisches Kolloquium

Dienstag, 30. Juni 2026 16:30 Uhr Black holes and revelations: unseen companions in stellar binaries

Kareem El-Badry , Caltech The Milky Way contains of order 100 million stellar-mass black holes. Yet, fewer than 100 black hole candidates are known in the Milky Way, and only about 25 are dynamically confirmed. For the last 50 years, our view of the Milky Way's black hole population has been shaped almost entirely by observations of X-ray binaries, which shine brightly but represent an extremely rare outcome of binary evolution. The supremacy of X-ray binaries is about to end: the 4th data release of the Gaia mission -- this December! -- is expected to uncover a population of non-interacting black holes that is larger than the X-ray binary population, has a better-understood selection function, and probes a different regime of stellar and binary evolution. I will discuss the tip of the iceberg that has already been revealed by astrometry from Gaia DR3, upcoming opportunities from DR4, and our evolving view of the compact object population. I will highlight constraints on the stability and efficiency of mass transfer from au-scale binaries, which astrometry is particularly sensitive to. To arrange a visit with the speaker during the visit, please contact their host: Hans-Walter Rix

Zentrum für Quantendynamik Kolloquium

Mittwoch, 8. Juli 2026 16:30 Uhr Circular Rydberg Atoms for Quantum Simulation

Dr. Florian Meinert, 5th Institute of Physics, University of Stuttgart Circular Rydberg Atoms for Quantum Simulation Dr. Florian Meinert 5th Institute of Physics, University of Stuttgart Highly excited atoms named after Janne Rydberg have played an important role throughout the history of atomic physics. In recent years, their strong mutual interaction was key to realize quantum computers and simulators with individual atoms trapped in optical tweezer arrays. Coherence times or gate fidelities reached on these devices are, however, fundamentally limited by the lifetime of the Rydberg electron. Orders of magnitude longer lived Rydberg states can be created by spinning up the electron as much as quantum mechanics allows for. Such circular Rydberg states have already led to Nobel-prize winning works on fundamentals of atom-light interaction. In our experiments, we generate, coherently control, and trap individual Strontium circular Rydberg atoms in optical tweezer arrays. Along this endeavor, we have recently gained access to giant trapped circular Rydberg states with principal quantum numbers up to n=103 and measured record lifetimes of more than 10 milliseconds. This is achieved via Purcell suppression of blackbody radiation at room temperature. Exploiting the second valence electron available in Strontium further allowed us to couple the circular Rydberg electron to inner shell excitations, which can be used for local optical control. These results now pave the way for quantum information processing and sensing utilizing the combination of extreme lifetimes and giant Rydberg blockade.

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