Abstract
The evolution of matter created in a heavy-ion collision depends on its initial geometry. Experimentally collision geometry is characterized with centrality. Procedure of centrality determination for the Compressed Baryonic Matter (CBM) experiment at FAIR is presented. Relation between parameters of the collision geometry (such as impact parameter magnitude) and centrality classes is extracted using multiplicity of produced charged particles. The latter is connected to the collision geometry parameters using Monte-Carlo Glauber approach.
Highlights
The Compressed Baryonic Matter (CBM) is a future fixed target experiment at the new accelerator complex FAIR in Darmstadt, Germany [6]
Initial geometry can be described by parameters such as impact parameter (b), number of binary nucleon-nucleon collisions (Ncoll) and number of participating nucleons (Npart)
To replicate the CBM tracking system acceptance only charged hadrons generated with UrQMD with the 2.5o < θ < 25o in the laboratory frame were accepted for the centrality analysis
Summary
The Compressed Baryonic Matter (CBM) is a future fixed target experiment at the new accelerator complex FAIR in Darmstadt, Germany [6]. Physics program of CBM includes investigation of the QCD phase diagram at high net baryon densities in the beam momentum range 3.3 − 12 AGeV/c for heavy nuclei. Observables which are sensitive to the properties of the strongly interacting matter created in heavy-ion collision depend on its initial geometry Initial geometry can be described by parameters such as impact parameter (b), number of binary nucleon-nucleon collisions (Ncoll) and number of participating nucleons (Npart). To characterize initial geometry in the least dependent way on experimental conditions a concept of centrality is introduced. Cb, is defined as a percentage of a total inelastic nucleus-nucleus crosssection, σiAnAel:
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