Bochum 2018 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 47: Heavy Ion Collisions and QCD Phases VIII

HK 47.2: Group Report

Thursday, March 1, 2018, 14:30–15:00, HZO 80

Measurement of short-lived baryons and mesons reconstructed in Au+Au collisions at 1.23A GeV with HADES.* — •Georgy Kornakov for the HADES collaboration — TU Darmstadt

The study of hadron properties in hot and dense QCD matter is one of the main topics in nuclear physics. The short-lived states (∼1 fm/c), produced and decayed within the QCD matter created in relativistic heavy-ion collisions, contain fundamental information about their properties and how they are modified by the surrounding medium. HADES measures rare and penetrating probes in the regime of 1-2 GeV kinetic energy per nucleon, where excitation of baryonic resonances is a key mechanism for meson, dilepton and strangeness production. However, reconstruction of the resonant signal is challenging. Despite the large branching ratios into charged pions and protons, the large combinatorial background demands precise techniques to identify the true signal. For such a purpose, an iterative method for background estimation has been developed. The measured π^+/−p and π⁺π⁻ differential spectra from Au+Au collisions are going to be presented in this contribution as well as the developed methods for their reconstruction. *This work has been supported by the VH-NG-823, Helmholtz Alliance HA216/EMMI and GSI