Abstract
The main goal of modern heavy-ion experiments is a comprehensive study of the QCD phase diagram, in a region of Quark-Gluon Plasma (QGP) and possible phase transition to QGP phase. Strange particles produced in the collision are sensitive probes of the created media. 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.
Highlights
The Compressed Baryonic Matter (CBM) experiment is future fixed-target heavy ion experiment, which will focus on a comprehensive study of the phase diagram of strongly interacting matter and a study of the equation of state of the matter at extremely high baryonic densities [1]
The tracking detectors of the CBM experiment will be positioned close enough to the collision point to detect Σ-hyperons: cτΣ+ = 2.4 cm and cτΣ− = 4.4 cm, the first station of Micro Vertex Detector (MVD) will be placed at about 5 cm and the first station of the Silicon Tracking System (STS) detector — at 30 cm from the target position downstream the beam
The missing mass method is proposed to be applied for their identification, that expands the physics potential of the CBM experiment
Summary
The Compressed Baryonic Matter (CBM) experiment is future fixed-target heavy ion experiment, which will focus on a comprehensive study of the phase diagram of strongly interacting matter and a study of the equation of state of the matter at extremely high baryonic densities [1]. Strangeness production is a sensitive probe of the media created in the collision. Reconstruction of Σ together with other strange particles completes the picture of strangeness production and allows to compare yields of Σ and Σ∗. The tracking detectors of the CBM experiment will be positioned close enough to the collision point to detect Σ-hyperons: cτΣ+ = 2.4 cm and cτΣ− = 4.4 cm, the first station of MVD will be placed at about 5 cm and the first station of the STS detector — at 30 cm from the target position downstream the beam. The CBM experiment provides perfect capabilities for registration of the Σ-hyperons, these particles can not reach the ToF detector to be identified. The missing mass method is proposed to be applied for their identification, that expands the physics potential of the CBM experiment
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