MEG II Experiment; to Search for Lepton Flavor Violation (μ→eγ)

• Ryusei Umakoshi (University of Tokyo)

After the discovery of neutral lepton flavor violation by Super Kamiokande, it is strongly suggested that lepton flavor number conservation is also violated in the charged sector. For the search of charged lepton flavor violation, the MEG II experiment's detectors were optimized to discover the decay mu->eγ. The liquid xenon (LXe) calorimeter is used to detect high-energetic photons. Since the start of the MEG II experiment in 2021, radiation damage of silicon photomultipliers in LXe has been observed, but the cause is not clear until now. Also, in 2024, a leak in the LXe calorimeter has been found. In this presentation, I will introduce the MEG II experiment, and my studies on the radiation damage and the xenon leak.

Your input on 2024 PPA survey

• Sophie Kollatzsch (PSI - Paul Scherrer Institut)
• Timothy David Hume (PSI - Paul Scherrer Institut)

The Path to Multiloop Amplitudes: From Feynman Diagrams to a Number

• Fabian Lange (PSI - Paul Scherrer Institut)

High-precision predictions in particle physics depend on the calculation of multiloop amplitudes - a process that transforms Feynman diagrams into numerical results. In this talk, I will demystify this intricate journey, using a simple yet illustrative example to guide you through the essential steps of the computation.