Münster 2017 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 58: Heavy Ion Collisions and QCD Phases XI
HK 58.3: Talk
Friday, March 31, 2017, 14:45–15:00, F 1
Reconstruction of short-lived particles with neutral daughter by the missing mass method — 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
The main goal of modern heavy-ion experiments is a comprehensive study of the QCD phase diagram, in a region of Qaurk-Gluon Plasma (QGP) and possible phase transition to QGP phase.
One of possible signals of QGP formation is enhanced strangeness production. Reconstruction of Σ particles together with other strange particles completes the picture of strangeness production. Σ+ and Σ- have all decay modes with at least one neutral daughter, which can not be registered by the CBM detector.
For their identification the missing mass method is proposed: a) tracks of the mother (Σ-) and the charged daughter (π-) particles are reconstructed in the tracking system; b) the neutral daughter particle (n) is reconstructed from these tracks; c) a mass constraint is set on the reconstructed neutral daughter; d) the mother particle is constructed of the charged and reconstructed neutral daughter particles and the mass spectrum is obtained, by which the particle can be identified.
The method can be applied for other strange particles too. In total 18 particle decays with neutral daughter are now included into physics analysis.