Abstract
The Belle II experiment at the SuperKEKB asymmetric-energy e+e− collider is a B factory experiment to search for new phenomena beyond the Standard Model. One of the most important keys in the experiment is particle identification, in particular the separation between kaons and pions. Therefore, a proximity focusing Aerogel Ring Imaging Cherenkov (ARICH) counter is used in the forward endcap region to distinguish kaons and pions with momenta up to 4 GeV/c. The ARICH counter consists of a silica aerogel radiator and Hybrid Avalanche Photo Detectors (HAPDs). When a charged particle passes through the radiator, Cherenkov photons are emitted and then detected by the HAPDs.The Belle II experiment started its physics run in 2019 and collected 424 fb−1 of collision data. The ARICH counter is running stably and the performance is in line with our expectations. We report the details of the operation of the HAPDs and the readout electronics. We also report on the performance of the ARICH counter based on the data.
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