Scientific Highlights
All Two-Loop Feynman Integrals for Five-Point One-Mass Scattering
We compute the complete set of two-loop master integrals for the scattering of four massless particles and a massive one. Our results are ready for phenomenological applications, removing a major obstacle to the computation of complete next-to-next-to-leading order QCD corrections to processes such as the production of a H/Z/W boson in association with two jets at the LHC. Furthermore ...
Muonic X-rays peer into brooch from Roman city
Using Muon Induced X-ray Emission, researchers could reveal the inner composition of a knob-bow fibula, excavated at Augusta Raurica in northern Switzerland.
Making sense of the muon’s misdemeanours
An exotic atom called muonium could explain why muons won’t stick to the rules, believe researchers using the Swiss Muon Source at Paul Scherrer Institute PSI.
Lab News
WOPM2025 at PSI - Workshop on optically-pumped magnetometers
From August 6 to 8, the 2025 workshop on 'Optically-Pumped Magnetometers' took place at PSI with a full day of Summer School lectures, followed by scientific sessions attended by 145 researchers from institutions worldwide.
New standards in nuclear physics
With unprecedented precision: PSI researchers measure the nuclear radius of muonic helium-3 and put the theories of atomic physics to the test.
In Search of New Physics: New Result from the MEG II Collaboration
On the occasion of a special seminar at the Paul Scherrer Institut (PSI) in Switzerland on 23 April 2024 the scientific collaboration of the MEG II experiment presented an important new result in the search for the decay of a positive muon into a positron and a photon. The findings, based on data collected in 2021 and 2022, are detailed in a paper published on arXiv and submitted to the journal Physical Review Letters.