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HK: Fachverband Physik der Hadronen und Kerne

HK 58: Heavy Ion Collisions and QCD Phases XI

HK 58.1: Gruppenbericht

Freitag, 31. März 2017, 14:00–14:30, F 1

Reconstruction of short lived mesons and baryons in HADES — •Georgy Kornakov for the HADES collaboration — Technische Universität Darmstadt

The measurement of hadron properties in hot and dense QCD matter is one of the important goals in nuclear physics. HADES measures rare and penetrating probes in elementary and heavy-ion collisions in the regime of 1 - 2 GeV kinetic energy per nucleon. Throughout the fireball evolution, mesons are mainly produced from the excitation and decay of baryonic resonances. Furthermore, the excited baryons make a significant contribution to the dilepton emission but also play an important role in the production of strange particles. The reconstruction of short-lived (∼1 fm/c) resonance states through their decay products is notoriously difficult. We have developed a new iterative algorithm, which can build the multi-differential background distribution from real data. This allows us to extract signals with signal-to-background ratios below 1%. In this contribution we will demonstrate the performance of the procedure studying inclusive π p and ππ final states in pion-induced reactions. Then, the differential spectra measured in Au+Au collisions at 1.23 AGeV will be discussed. Apparent resonances mass shifts and broadening as a function of centrality and transverse momentum will be elaborated. This work has been supported by TU Darmstadt: VH-NG-823, Helmholtz Alliance HA216/EMMI and GSI.