SMuK 2023 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Heavy-Ion Collisions and QCD Phases V

HK 27.2: Talk

Wednesday, March 22, 2023, 14:30–14:45, SCH/A216

Improving the CBM RICH lepton reconstruction — •Pavish Subramani, Christian Pauly, and Karl-Heinz Kampert — Bergische Universität Wuppertal

The Compressed Baryonic Matter experiment (CBM) is a heavy ion fixed target experiment, designed to probe the QCD phase diagram near the critical point at high µ_B and medium temperatures. The Ring Imaging Cherenkov Detector (RICH), situated directly behind the Micro Vertex Detector (MVD) and Silicon Tracking System (STS), is designed to distinguish electrons from pions, being the most abundantly produced particles in heavy ion collisions in the momentum range up to 10 GeV/c. One major source of background in the dilepton analysis is contamination by pions arising from false ring track matching in the RICH. Moreover, electrons from photon conversion inside the target and detector material are partly undetected by the STS tracking system, but cause additional Cherenkov rings in the RICH. If these rings are falsely matched to pion tracks they lead to electron misidentification, and thus can increase the combinatorial background and reduce the signal-to-background ratio.

This talk will focus on possible improvements in the efficiency of primary electron identification and pion suppression, for example by using additional information from the Transition Radiation Detector (TRD) situated directly behind the RICH.

^* supported by BMBF (05P19PXFCA, 05P21PXFC1) and GSI.