The DØ Experiment consists of a worldwide collaboration of scientists conducting research of the fundamental nature of matter. The experiment is located at the world´s premier high-energy accelerator, the Tevatron Collider, at the Fermi National Accelerator Laboratory (Fermilab) in Batavia, Illinois, USA. The research is focused on precise studies of interactions of protons and antiprotons at the highest available energies. It involves and intense search for subatomic clues that reveal the character of the building blocks of the universe. and Alexander Kupčo, Miloš Lokajíček.