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HK: Fachverband Physik der Hadronen und Kerne
HK 56: Heavy-Ion Collisions and QCD Phases XIV
HK 56.3: Vortrag
Mittwoch, 13. März 2024, 18:00–18:15, HBR 62: EG 05
Reconstruction of neutral mesons via photon conversion method in Ag-Ag collisions at 1.58A GeV with HADES* — •Tetiana Povar for the HADES collaboration — Bergische Universität Wuppertal,Wuppertal,Germany
Virtual photons and their decays into electron pairs (e− + e+ ) represent one of the best sources for investigating the properties of nuclear matter under extreme conditions of temperature and density. One of the experiments which focuses on measurements of the dilepton spectrum is the HADES (High Acceptance DiElectron Spectrometer) at GSI in Darmstadt. The precise determination of all contributing sources in the dilepton spectrum is critical to obtaining accurate information about the dense nuclear medium in the early stages of collisions. The major background in the (e− + e+ ) spectrum at the low invariant mass region is Dalitz-decays of light neutral mesons (π0, η), so that precise knowledge about neutral meson production is mandatory for the dilepton analyses.
In HADES, these mesons can be reconstructed via their dominant γ γ decays (BR ∼ 99%) using the electromagnetic calorimeter (ECAL) or via double external pair conversion in target or detector material.
In this contribution, main emphasis will be put on determining the efficiency and acceptance corrected π0 yield applying the conversion method in Ag+Ag collisions at 1.58A GeV, including a detailed discussion of systematic and statistical uncertainties.
* Work supported by BMBF ( 05P21PXFC1) and GSI.
Keywords: Neutral mesons; conversion method; dilepton spectrum