Heidelberg 2015 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 34: Heavy Ion Collisions and QCD Phases 4

HK 34.7: Vortrag

Dienstag, 24. März 2015, 18:45–19:00, T/HS1

Hadronic resonance reconstruction in πA and AA collisions at HADES — •Georgy Kornakov for the HADES collaboration — TU Darmstadt

Properties of nuclear matter at high temperatures and densities can be accessed by means of heavy ion collisions such as produced at SIS18 energies at GSI Helmholtzzentrum für Schwerionenforschung, in Darmstadt. The masses, widths and spectral shapes of the short lived resonances when embedded into a hot and dense medium can be modified. These modifications can be accessed by comparison of heavy-ion data to elementary and cold nuclear matter reactions. Moreover, their decay via a virtual photon contribute to the dilepton spectra and has to be properly handled in order to interpret the spectrum.

The inclusive reconstruction of strongly decaying particles with a lifetime close to that of the hot and dense medium is challenging as the decay products undergo rescattering and regeneration before freeze out. Moreover, the width and the low signal to background ratio of their invariant masses makes the reconstruction technically complicated.

In this contribution the method for inclusive resonance reconstruction in πA and AA collisions measured by HADES and preliminary results of such analysis will be presented.

This work has been supported by VH-NG-823, GSI and EMMI.