München 2019 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 34: Heavy-Ion Collisions and QCD Phases VI
HK 34.4: Talk
Wednesday, March 20, 2019, 15:00–15:15, HS 15
Reconstruction of eta meson at CBM-RICH detector using conversion method* — •Ievgenii Kres, Karl-Heinz Kampert, and Christian Pauly for the CBM collaboration — Bergische Universität Wuppertal
The Compressed Baryonic Matter (CBM) experiment is part of a worldwide research program devoted to study the phase diagram of strongly interacting matter at high baryon density ρB and moderate temperatures T in A+A collisions from 2−11 AGeV (SIS100). One of the main physics motivations of CBM is dilepton measurements. Lepton pairs offer the unique possibility to look into the fireball and to study the microscopic properties of hot and dense strongly interacting matter, since they are not affected by hadronic final state interactions. A central component of the proposed detector setup is a Ring Imaging Cherenkov Detector (RICH), which is intended to identify leptons among all other particles. The measured dilepton invariant mass spectrum at low mass region is dominated by physical background from decays of π0 and η mesons. The presented analysis aims to reconstruct η mesons via double conversion (η → γ + γ → (e+ e−) + (e+ e−)) in order to scale these background channels accurately in the integral e+ e− invariant mass spectrum. Proper counting of the η mesons requires an exact description of the combinatorial background below the η invariant mass peak, which is achieved using the event mixing technique. First results of this conversion analysis are presented, including reconstruction efficiencies and signal to background estimation.
*gefördert durch BMBF 05P15PXFCA, und GSI