Darmstadt 2016 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 25: Heavy Ion Collision and QCD Phases VII

HK 25.2: Talk

Tuesday, March 15, 2016, 17:00–17:15, S1/01 A4

Performance of centrality determination in heavy-ion collisions with CBM experiment — •Viktor Klochkov and Ilya Selyuzhenkov for the CBM collaboration — GSI, Darmstadt

The goal of the CBM experiment at FAIR is to investigate the properties of compressed baryonic matter. The measurement of physics observables in heavy-ion collisions requires information about event geometry. A magnitude of the impact parameter, which is among the most important parameters to describe collision geometry, cannot be measured directly in experiment. One can estimate it by measuring produced particle's multiplicities or energy of the spectator fragments. Typically, the collisions are divided into centrality classes which corresponds to the ranges of impact parameter with e.g. centrality class 0-5% corresponds to most central events, and 95-100% to the most peripheral collisions. Sensitivity to the range of impact parameters with the Silicon Tracking System (STS) and Projectile Spectator Detector (PSD) to select centrality classes in the CBM experiment will be presented. The STS is measuring the multiplicity of the particles produced in the nuclei overlap zone and different areas of the PSD are sensitive to both spectator fragments and produced particles.

Supported by the GSI Helmholtzzentrum für Schwerionenforschung.