R. Roehnelt
A5056965394- Particle Detector Development and Performance
- Crystallography and Radiation Phenomena
- Particle physics theoretical and experimental studies
- Radiation Detection and Scintillator Technologies
- Quantum Chromodynamics and Particle Interactions
- Nuclear Physics and Applications
- Neutrino Physics Research
- Computational Physics and Python Applications
A next-generation rare pion decay experiment, PIONEER, is strongly motivated by several inconsistencies between Standard Model (SM) predictions and data pointing towards the potential violation of lepton flavor universality. It will probe non-SM explanations these anomalies through sensitivity to quantum effects new particles even if their masses are at very high scales. Measurement charged-pion branching ratio electrons vs. muons $R_{e/\mu}$ extremely sensitive physics effects. At present,...
The physics motivation and the conceptual design of PIONEER experiment, a next-generation rare pion decay experiment testing lepton flavor universality CKM unitarity, are described. Phase I which was proposed approved at Paul Scherrer Institut, aims measuring charged-pion branching ratio to electrons vs.\ muons, $R_{e/\mu}$, 15 times more precisely than current experimental result, reaching precision Standard Model (SM) prediction 1 part in $10^4$. Considering several inconsistencies between...
We report measurements of ten custom-made high-homogeneity LYSO crystals. The investigation is motivated by the need for a compact, high-resolution, and fast electromagnetic calorimeter new rare pion decay experiment. Each $2.5\times 2.5 \times 18$ cm$^3$ crystal was first characterized general light yield properties then its longitudinal response uniformity energy resolution were measured using low-energy gamma sources. crystals assembled as an array subjected to 30 - 100 MeV positron beam...