Zeit, Ort:

11:15 Uhr, Central seminar room, library building

Redner:

Chloe Goupy

Titel:

Probing sub-eV neutrino mass and light sterile neutrinos with the KATRIN experiment

The absolute mass scale of the neutrino remains one of the key open questions in particle physics and cosmology. The Karlsruhe Tritium Neutrino (KATRIN) experiment addresses this challenge by precisely measuring the energy spectrum of electrons from tritium beta decay near its endpoint. KATRIN combines a high-intensity gaseous molecular tritium source with a high-resolution electrostatic spectrometer with magnetic adiabatic collimation. This approach has enabled KATRIN to reach sub-eV sensitivity and set a world-leading upper limit of 0.45 eV/c^2 (90\% confidence level) on the effective electron anti-neutrino mass, based on data from the first five measurement campaigns. These results reflect major advancements in background suppression, control of systematic uncertainties, and statistical precision. In this talk, I will present the latest results from KATRIN, including the neutrino mass analysis as well as recent results on probing the eV-scale sterile neutrinos parameter space using the same experimental data.

Zeit, Ort:

11:15 Uhr, Seminar room 242, Bothe Lab

Redner:

Dr. Sergey Volkov, MPIK

Titel:

Two-loop vacuum polarization in the Coulomb field of a nucleus

Zeit, Ort:

09:30 Uhr, Zentraler Seminarraum / Central seminar room (library)

Redner:

NN

Titel:

tba

Zeit, Ort:

11:00 Uhr, Grosser Hoersaal/Big Lecture Hall (library)

Redner:

Professor Ulrich Uwer, Professor Vincenzo Vagnoni

Titel:

Precision Physics at a Hadron Collider: Highlights from the LHCb-Experiment

Since the start of the Large Hadron Collider (LHC) the LHCb experiment has become the leading flavour physics experiment worldwide. Initially designed to probe the matter-antimatter asymmetry of the universe by precision measurements of CP violation in heavy flavour decays, it continuously expanded its physics portfolio to cover also QCD and electroweak physics, the study of heavy ion collisions and most recentlyalso fixed target physics. The kolloquium will start with a presentationof highlights from flavour- and electroweak physics, the second partwill focus on strong interactions and new exotic states found by the experiment.