Darmstadt 2016 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 24: Heavy Ion Collision and QCD Phases VI
HK 24.2: Talk
Tuesday, March 15, 2016, 16:45–17:00, S1/01 A01
Σ hyperons reconstruction by the missing mass method — Ivan Kisel1,2,3, •Pavel Kisel1,3,4, Peter Senger3, Iouri Vassiliev3, and Maksym Zyzak1,2,3 for the CBM collaboration — 1Goethe-Universität Frankfurt — 2Frankfurt Institute for Advanced Studies — 3GSI Helmholtzzentrum für Schwerionenforschung GmbH — 4Joint Institute for Nuclear Research
The main goal of the CBM experiment is a comprehensive study of the QCD phase diagram in a region of Qaurk-Gluon Plasma (QGP) and possible phase transition to the QGP phase.
One of the expected signals of QGP formation is enhanced strangeness production. Being abundant particles, Σ+ and Σ− carry out a large fraction of produced strange quarks. Therefore, reconstruction of Σ hyperons completes the picture of strangeness production.
Σ+ and Σ− have all decay modes with at least one neutral daughter. However, these particles have a lifetime sufficient to be registered by the tracking system: cτ = 2.4 cm for Σ+ and cτ = 4.4 cm for Σ−. For their identification the missing mass method is proposed to be applied. The method allow to obtain a large efficiency in the level of several percents together with a high signal to background level.