24-28 February 2020
Budker Institute of Nuclear Physics
Asia/Novosibirsk timezone

Performance of the Belle II Aerogel-Based Ring-Imaging Cherenkov counter system in SuperKEKB 2019 Phase 3 operation

27 Feb 2020, 15:30
Contributed Oral Particle identification Particle Identification


Dr Yun-Tsung Lai (KEK)


The Belle II experiment with SuperKEKB beam collision has started since 2018. The physics target of the experiment is to improve measurement of rare B meson decays with better and higher luminosity. An aerogel-based proximity focusing ring-imaging Cherenkov (ARICH) counter is utilized for charged particle identification (PID) in the forward end-cap region. For the study of CP violation involved in B decays, the goal is to separate kaons from pions up to and above 4σ for momenta up to 4 GeV/c. The counter is made of aerogel tiles to generate Cherenkov photons, and a 144-channel Hybrid Avalanche Photo Detector (HAPD) is adopted as a photo-detector. The HAPD signal is digitized by using the Application Specific Integrated Circuit (ASICs). Two different types of Field Programmable Gate Array (FPGA) boards are responsible for data processing and acquisition. In the Phase 3 (SuperKEKB beam collision from Apr. to Dec. 2019), the ARICH system have been operating smoothly, and software algorithm has been validated with the data as well. We will present the status of the entire hardware system during Phase 3 operation and the preliminary result of PID performance.

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