Experimental Particle Physics F9


Research departments
Administration and support units


Departmental research is devoted to experimental studies of elementary particles, to reveal the ultimate building blocks of matter and the nature of the interactions between them. Experiments are carried out within large collaborative programmes at international centres for particle physics at CERN near Geneva, at DESY in Hamburg and at KEK in Tsukuba.

The Department is also engaged in developing and applying the technologically advanced particle detectors, which are demanded by such measurements. Astro-particle physics is an emerging field applying experimental techniques of particle physics to solve astrophysical problems. Slovenian researchers are participating in the construction of Pierre Auger observatory and in first measurements of ultra-high-energy cosmic rays with the apparatus spread over 3000 km2 near Malargue in Argentina.


In order to reveal the ultimate secrets of nature in the world of elementary particles, accelerators with higher and higher energies are needed. Their cost, both in terms of money and human resources, has grown to the level where they are affordable only as joint international enterprises. Thus, future accelerators will be unique facilities of their kind, the first being the Large Hadron Collider (LHC), under construction at the European Organization for Nuclear Research (CERN) near Geneva. Researchers will exploit this facility to perform experiments in presently inaccessible regions of energy, which, though pushed higher and higher, still remains minute compared to that of the vast blast of the Big Bang that led to the creation of the Universe. Together with colleagues from the Physics Department of the Faculty of Mathematics and Physics and the Faculty of Electrical Engineering of the University of Ljubljana, and from the Faculty of Chemistry and Chemical Technology of the University of Maribor, we are performing measurements at CERN, the German centre DESY in Hamburg and the Japanese centre KEK in Tsukuba. We are taking part in three experiments, each conducted as an international collaboration:

  • ATLAS at the Large Hadron Collider (LHC) at CERN (1900 researchers, 150 institutions),
  • Belle at the asymmetric electron-positron collider (KEK-B) at KEK (400 researchers, 56 institutions) and
  • HERA-B at the HERA electron-proton collider at DESY (310 researchers, 33 institutions).

Departmental web pages

Head of Department
Prof. Marko Mikuž, Ph. D., marko.mikuz@ijs.si

Andreja Butina, Andreja.Butina@ijs.si
Telephone: +386 1 477 37 42
Fax: +386 1 477 31 66

In the field of astroparticle physics we are part of the Pierre Auger collaboration (200 researchers, 55 institutions), which is constructing a giant scale (3000 km2) observatory near Malargue in Argentina for detection of ultra-high-energy cosmic rays. This endeavour is carried out in collaboration with colleagues from University of Nova Gorica.

J. Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia, Telephone: +386 1 477 39 00, Fax: +386 1 251 93 85