Each year more than 13.000 high school students in more than60 countries come to one of about 225 nearby universities or research centres for one day in order to unravel the mysteries of particle physics. Lectures from active scientists give insight in topics and methods of basic research at the fundaments of matter and forces, enabling the students to perform measurements on real data from particle physics experiments themselves. At the end of each day, like in an international research collaboration, the participants join in a video conference for discussion and combination of their results. International Masterclasses 2025 will take place from 24. February - 11. April 2025.

Discover the world of Quarks and Leptons with real data

This program is organized at TU Dresden and at QuarkNet Notre Dame in the framework of the International Particle Physics Outreach Group IPPOG. The video linkup between the institutes is realized with valuable technical support from the CERN IT support and at Fermilab IT. We gratefully acknowledge financial support from CERN, and from TU Dresden and from the US National Science Foundation and the US Department of Energy.