Bochum 2018 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 2: Heavy Ion Collisions and QCD Phases I

HK 2.4: Vortrag

Montag, 26. Februar 2018, 15:00–15:15, HZO 60

Reconstruction of neutral pions and direct photons at CBM-RICH detector via conversion* — •Ievgenii Kres, Karl-Heinz Kampert, and Christian Pauly for the CBM collaboration — University of Wuppertal

The Compressed Baryonic Matter (CBM) experiment at the future FAIR complex will investigate the phase diagram of strongly interacting matter at high baryon density and moderate temperatures in A+A collisions from 2-11 AGeV (SIS100). A central component of the proposed detector setup is a Ring Imaging Cherenkov Detector (RICH) using CO₂ as radiator gas, a focussing optics with a large spherical mirror, and, as a result of recent CBM RICH geometry optimizations, a cylindrically shaped photon detection surface. During the nucleus-nucleus collisions the created fireball passes several stages of evolution, where only specific types of particles can be produced. As leptons and photons are not affected by hadronic final state interactions, they offer the possibility to look into the fireball at different stages of evolution. The yields and transverse-momentum (p_T) spectra of identified particles are widely used to determine the conditions of the fireball at chemical and kinetic freeze-out. The presented analysis aims at reconstructing π⁰ mesons via double conversion (π⁰ → γ (e⁺ e⁻) + γ (e⁺ e⁻)) and direct photons via single conversion (γ → (e⁺ e⁻)) inside the target or first detector layers in order to use their transverse-momentum (p_T) spectra to study fireball properties. Results of this conversion analysis are presented.

*gefördert durch BMBF 05P15PXFCA und GSI