Abstract
The Compressed Baryonic Matter experiment (CBM) at FAIR aims to study the area of the QCD phase diagram at high net baryon densities and moderate temperatures with collisions of heavy ions at sNN=2.8–4.9 GeV. The anisotropic transverse flow is one of the most important observable phenomena in a study of the properties of matter created in such collisions. Flow measurements require the knowledge of the collision symmetry plane, which can be determined from the deflection of the collision spectators in the plane transverse to the direction of the moving ions. The CBM performance for projectile spectator symmetry plane estimation is studied with GEANT4 Monte Carlo simulations using collisions of gold ions with beam momentum of 12A GeV/c generated with the DCM-QGSM-SMM model. Different data-driven methods to extract the correction factor in flow analysis for the resolution of the spectator symmetry plane estimated with the CBM Projectile Spectator Detector are investigated.
Highlights
The Compressed Baryonic Matter (CBM) is a future experiment at the currently constructed Facility for Antiproton and Ion Research (FAIR)
We present methods for the resolution correction factor extraction and the Compressed Baryonic Matter experiment (CBM) performance for the projectile spectator symmetry plane estimation as a function of centrality for collisions of gold ions with a beam momentum of 12A GeV/c generated with the hybrid model combining the Dubna Cascade, Quark-Gluon String and the Statistical Multifragmentation Models (DCM-QGSM-SMM)
Despite the fact that the results below are presented for the RPSD calculated using the scalar product method [1], which operates in terms of the flow vectors directly without normalizing them by their magnitude as in the event plane method, all conclusions about CBM performance are independent from the choice of this method
Summary
The Compressed Baryonic Matter (CBM) is a future experiment at the currently constructed Facility for Antiproton and Ion Research (FAIR). Anisotropic transverse flow is one of the most important observable to probe the equation of state and transport properties of matter created in heavy-ion collisions. It is quantified with the anisotropic flow coefficients vn [1] in a Fourier decomposition of azimuthal probability density ρ of produced particles relative to the collision symmetry plane given by the angle Ψs: ρ(φ − Ψs) ∞. Due to the fluctuating position of the nucleons inside the colliding nuclei, different collision symmetry planes can be identified that are connected to the orientation of the matter in the nuclei overlap area and deflection of the spectator fragments in the plane transverse to the moving ions (ΨSP). In the CBM experiment, the projectile spectator plane can be estimated using the transverse energy distribution in the Projectile Spectator Detector (PSD), from which a corresponding angle
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