Abstract
The Compressed Baryonic Matter (CBM) experiment is a next-generation fixed-target detector which will operate at the future Facility for Antiproton and Ion Re- search (FAIR) in Darmstadt. The goal of this experiment is to explore the QCD phase diagram in the region of high net baryon densities using high-energy nucleus-nucleus col- lisions. Its research program includes the study of the equation-of-state of nuclear matter at high baryon densities, the search for the deconfinement and chiral phase transitions and the search for the QCD critical point. The CBM detector is designed to measure both bulk observables with a large acceptance and rare diagnostic probes such as charm parti- cles, multi-strange hyperons, and low mass vector mesons in their di-leptonic decay. The physics program of CBM will be summarized, followed by an overview of the detector concept, a selection of the expected physics performance, and the status of preparation of the experiment.
Highlights
The Compressed Baryonic Matter (CBM) experiment is a fixed-target heavy-ion detector which will operate at the future FAIR facility (GSI, Darmstadt)
The Compressed Baryonic Matter (CBM) experiment is a next-generation fixed-target detector which will operate at the future Facility for Antiproton and Ion Research (FAIR) in Darmstadt
Its research program includes the study of the equation-of-state of nuclear matter at high baryon densities, the search for the deconfinement and chiral phase transitions and the search for the Quantum Chromo-Dynamics (QCD) critical point
Summary
The CBM experiment is a fixed-target heavy-ion detector which will operate at the future FAIR facility (GSI, Darmstadt). According to lattice QCD, the phase transition from confined to deconfined matter at high temperatures and vanishing net baryon densities is a smooth cross-over, while at moderate temperatures but higher baryon densities a first-order phase transition may take place [1, 2] Exploring the latter region of the QCD phase diagram, poorly known theoretically and experimentally, is the object of several physics programs at lower beam energies, which are currently carried out at SPS/CERN and RHIC/BNL and which will be continued later at NICA/JINR and FAIR. There are robust theoretical predictions that chiral symmetry is at least partially restored in dense matter [5], and that, among other effects, the masses of hadrons (containing light quarks) in dense baryonic matter can differ from their corresponding free masses The study of such in-medium effects is another important goal of the CBM experiment. An experimental evidence of the first-order phase transition, the QCD critical point and in-medium modifications of hadron masses in dense baryonic matter would be a breakthrough for understanding the properties of the strong interaction
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