Each year about 5000 high school students in 22 countries come to one of about 80 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.

As for the International Masterclass weeks 2009 we will organize the EPPOG Masterclasses 2009 in a three-weeks period from 16.03.09 - 03.04.09, where each day up to six out of about 80 institutes participate.

This program is organized at TU Dresden in the framework of the European Particle Physics Outreach Group EPPOG. The video linkup between the institutes is realized using the EVO technology, with valuable technical support from the Caltech EVO team (including the EVO Slovak group) and CERN. We gratefully acknowledge financial support from the Helmholtz Alliance "Physics at the Terascale", the BMBF German Federal Ministry of Education and Research, EPS HEPP High-Energy and Particle Physics Division, the EPS PED Physics Education Division, from the Slovak Ministry of Education, and from TU Dresden. Printed material for the students is contributed from CERN and DESY. An offline version of this website is available as CD-ROM from the organizers and distributed to all participating students.