Bochum 2018 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 23: Heavy Ion Collisions and QCD Phases IV
HK 23.7: Talk
Tuesday, February 27, 2018, 18:15–18:30, HZO 60
Multi-differential analysis of Σ hyperons in the CBM experiment — Ivan Kisel1,2,3, •Pavel Kisel1,3,4, Peter Senger3, Iouri Vassiliev3, and Maksym Zyzak3 for the CBM collaboration — 1Goethe-Universität Frankfurt — 2Frankfurt Institute for Advanced Studies — 3GSI Helmholtzzentrum für Schwerionenforschung GmbH — 4Joint Institute for Nuclear Research
Strange particles are important probes of the properties of hot and dense nuclear matter produced in high-energy heavy-ion collisions. A large fraction of the produced strange quarks is carried by Σ+ and Σ− hyperons, which have decay modes with at least one neutral daughter particle.
In order to identify these hyperons, a missing mass method has been developed and implemented in the CBM KF Particle Finder package, which allows to reconstruct 18 decays with neutral daughter particles with high efficiency and large signal-to-background ratios. The results of a multi-differential analysis of Σ hyperon yields as function of momentum, rapidity, and transverse mass will be presented. The reconstructed distributions are in a good agreement with the Monte Carlo spectra.