Köln 2025 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 16: Heavy-Ion Collisions and QCD Phases III
HK 16.1: Talk
Tuesday, March 11, 2025, 14:00–14:15, HS 3 Chemie
Low-mass, low-momentum virtual photon measurement with HADES — •Iuliana Carina Udrea for the HADES collaboration — TU Darmstadt
Collisions of heavy nuclei at relativistic energies create a hot and dense medium, offering a unique environment to explore its microscopic properties using electromagnetic probes.
Dileptons are particularly advantageous for this purpose, as they do not interact strongly with the surrounding matter, allowing them to carry undisturbed information about the QCD matter produced during the reaction. In particular, the study of low-mass and low-momentum dileptons provides valuable insights into transport properties such as electrical conductivity.
In this contribution, we outline the key steps towards investigating soft dileptons. For this purpose data from Ag+Ag collisions at 1.23A GeV with a nominal magnetic field strength are compared with a reduced magnetic field (5% of Bmax), the latter increasing the acceptance for low-momentum pairs.
Furthermore, we will present simulations at reduced magnetic field strength, which provide optimal parameters for the upcoming run in 2024/2025 with Au+Au collisions at 0.8A GeV, conducted with the HADES experiment.
This work is supported by: GSI F&E and HGS-HIRe.
Keywords: electromagnetic probes; heavy-ion collisions; low-mass low-momentum dileptons