Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 2: Heavy-Ion Collisions and QCD Phases I
HK 2.2: Vortrag
Montag, 28. März 2022, 14:30–14:45, HK-H1
Reconstruction of neutral mesons via photon conversion method in Ag-Ag collisions at 1.58A GeV with HADES* — •Tetiana Povar for the HADES collaboration — University of Wuppertal
A main goal of the HADES (High Acceptance DiElectron Spectrometer) experiment is to investigate properties of strongly interacting matter at moderate temperatures and large baryo-chemical potential. One tool is the study of virtual photons and their decays into electron pairs (e− + e+ ) in hadron and heavy-ion collisions. Due to their large mean free path in the final state, electrons and positrons are particularly ideal probes to study the pair production also in the dense nuclear medium. Dalitz-decays of the light neutral mesons π0, η constitute a major contribution to the observed dielectron spectrum at low invariant masses (below the vector-meson pole mass). A precise determination of their abundance is crucial for proper control of the composition of the whole spectrum.
In HADES, these mesons can be reconstructed via their dominant γ γ decays (BR ∼ 99%) utilizing double photon detection in the electromagnetic calorimeter (ECAL) or via double external pair conversion γmaterial → e+ + e− in target or detector material with subsequent electron/positron identification.
We will present preliminary results of π0 and η production yields in Ag-Ag collisions at 1.58A GeV incident beam energy applying the double photon conversion method (PCM).
* Work supported by BMBF (05P19PXFCA), and GSI.