Goals and status of the CBM experiment
GSI Darmstadt, Germany
The goal of the heavy-ion collision program at the future Facility for Antiproton and Ion Research (FAIR) in Darmstadt (Germany) is to explore the phase diagram of strongly interacting matter in the region of the highest baryon densities. The CBM research program addresses fundamental aspects of QCD such as the equation-of-state of highly compressed baryonic matter, the deconﬁnement phase transition and its critical endpoint, chiral symmetry restoration at high baryon densities, and the in-medium properties of hadrons. The corresponding key observables comprise low-mass vector mesons decaying into lepton pairs which serve as penetrating probes, hidden and open charm produced at threshold beam energies, (multi-) strange particles, and global features like collective ﬂow and event-by-event ﬂuctuations. The experimental task is to identify both hadrons and leptons and to detect rare probes in a heavy-ion environment. The experimental challenge is to select rare events in nucleus-nucleus collisions with charged particle multiplicities of about 1000 per central event at reaction rates of up to 10 MHz. Such measurements require fast and radiation hard detectors, fast and selftriggered read-out electronics, a high-speed data acquisition system, and online event selection based on full track reconstruction. The layout of the CBM detector system and the results of feasibility studies will be presented. More than 400 scientists from 50 institutions and 15 countries actually participate in the realization of the CBM experiment which represents a major international eﬀort in future heavy-ion physics.
© Owned by the authors, published by EDP Sciences, 2010