ETH Zurich scientists prepare to test gravity on muons
Researchers at ETH Zurich and the Paul Scherrer Institute plan an experiment in September 2026 to measure how gravity affects muons.
Creating a controlled beam of exotic atoms
Scientists have developed a method to produce a steady stream of muonium. This atom contains a heavier cousin of the electron known as a muon. The team uses a large particle accelerator at PSI to generate these particles and their antiparticles.
Testing Einstein theory with second-generation particles
The experiment aims to see if gravity pulls on muons exactly like it does on electrons. Ordinary matter consists of first-generation particles such as protons, neutrons, and standard electrons. Finding a difference would suggest new physics or a hypothetical fifth force.
Measuring gravitational interaction with precision tools
Professors say this step is crucial for understanding fundamental assumptions about gravity. The results could reveal whether the theory holds true for all particle types. Any unexpected outcome would be a major surprise for the physics community.
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