Performance of the Belle II Aerogel-Based Ring-Imaging Cherenkov Counter System in SuperKEKB 2019 Phase 3 Operation
Journal of Instrumentation(2020)SCI 4区
High Energy Accelerator Res Org KEK | Lab Acceierateur Lineaire LAL | Univ Tokyo | Nagoya Univ | Tokyo Metropolitan Coll Ind Technol | Univ Napoli Federico II | Tokyo Metropolitan Univ | Alikhanyan Natl Sci Lab | Chiba Univ | Kitasato Univ | SOKENDAI Grad Univ Adv Studies | Toho Univ | Univ Maribor | Jozef Stefan Inst | Niigata Univ
Abstract
In the Belle II experiment, an aerogel-based proximity focusing ring-imaging Cherenkov (ARICH) counter is used for charged particle identification (PID) in the forward end-cap region. The goal is to separate kaons from pions at above 4 sigma significance level for momenta up to 4 GeV/c, which is critical for the measurements of rare B decays and CP violation in B decays. Chrerenkov photons are emitted in aerogel tiles and 144-channel Hybrid Avalanche Photo Detector (HAPDs) are used as the photo-detectors. We utilize a two-layer aerogel design with different refractive indexes in a focusing configuration. In Phase 3 of the Belle II operation (from Apr. 2019), the ARICH system has been operating smoothly. The performance of particle identification with ARICH has been well validated and is in agreement with simulation.
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Key words
Cherenkov detectors,Particle identification methods
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