Gießen 2024 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 33: Heavy-Ion Collisions and QCD Phases VII

HK 33.5: Talk

Tuesday, March 12, 2024, 18:45–19:00, HBR 62: EG 05

Neutral pion production in p+p collisions at 1.58 GeV beam energy with the HADES experiment — •Lena Marie Albohn for the HADES collaboration — Justus-Liebig-Universität Gießen

In February 2022 p+p collisions with a kinetic beam energy of 1.58 GeV were recorded with the HADES (High Acceptance DiElectron Spectrometer) experiment at the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt, Germany. This measurement is important for providing a p+p reference for the Ag+Ag collisions taken at the same energy in 2019. Dielectrons do not interact strongly and are therefore excellent probes for the hot dense phase of particle collisions. The background of the dielectron spectra at low invariant masses is dominated by Dalitz decays of pions and other neutral mesons. Hence the objective of this work is to calculate the multiplicity of neutral pions in p+p collisions through their decay into two photons detected in the electromagnetic calorimeter. The calculation of this multiplicity is done via a multidifferential analysis of the invariant mass spectra of photon pairs, dependent on transverse momentum and rapidity.

Keywords: pi0 Produktion; HADES; p+p Kollisionen; Di-Elektronen