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HK: Fachverband Physik der Hadronen und Kerne
HK 35: Heavy-Ion Collisions and QCD Phases VIII
HK 35.4: Vortrag
Mittwoch, 1. April 2020, 17:30–17:45, J-HS G
Reconstruction of tracks with very low momentum in TPC detector — •Grigory Kozlov1,2, Ivan Kisel1,3,4, and Yuri Fisyak5 for the CBM collaboration — 1Goethe-Universität, Frankfurt, Germany — 2JINR, Dubna, Russia — 3FIAS, Frankfurt, Germany — 4GSI, Darmstadt, Germany — 5BNL, Upton, USA
Within the CBM Phase-0 we develop and study the Cellular Automaton (CA) track finder in the iTPC detector of the STAR experiment (RHIC, BNL). The Beam Energy Scan BES-II program at STAR will explore region of the QCD phase diagram with energies 7.7-19.6 GeV (collider) and 3.0-7.7 GeV (fixed-target), which poses new challenges for the tracking algorithm. Collision of beam at these energies in STAR leads to production of particles with very low momenta. Such particles move parallel to the beam axes along spiral trajectories that significantly complicates the operation of the TPC detector, especially in fixed target (FXT) mode, as well as the eTOF detector (CBM TOF). Reconstruction of such loopers is a difficult task, as the used track model allows to reconstruct them only in the form of a set of segments of a helical trajectory. Increasing the number of pad rows in the iTPC detector has made the number of measurements in segments sufficient to find them locally using the CA algorithm. Therefore an additional procedure to merge the reconstructed segments into long loopers has been developed. The algorithm thus allows to increase the acceptance of TPC for low momentum tracks which is especially important for particle identification with eTOF in the FXT program. The CA algorithm and the results of its application are presented and discussed.