Using multiplicity of produced particles for centrality determination in heavy-ion collisions with the CBM experiment

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.

CBM performance for the measurement of (multi)strange hadrons’ anisotropic flow in Au+Au collisions at FAIR

“…The simulated GEANT4 signals were used to reconstruct the collision and its products with algorithms implemented in the CBMROOT [6] software. Centrality was estimated using charged track multiplicity following the procedure described in [7,8]. Particles were identified using TOF signals and the Bayesian approach [8, 9].…”

CBM Performance for Λ Hyperon Directed Flow Measurements in Au + Au Collisions at 12A GeV/c

“…Centrality was estimated using track multiplicity following the procedure described in [18] and implemented in [19]. For multiplicity calculation, the reconstructed tracks with vertex χ 2 vertex < 3, number of hits N hits ≥ 4, reduced track χ 2 track /NDF < 3 and pseudorapidity range 0.2 < η < 6 were used.…”

The Compressed Baryonic Matter (CBM) Experiment at FAIR – Physics, Status and Prospects

“…These algorithms have been adapted and successfully implemented in STAR experimentʼs express analysis chain for BES-II[107,108]. Moreover, procedures for determining the collision centrality have been developed by using charged particle multiplicities in STS and the energy of spectator fragments in PSD[109,110].…”