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Title: Particle identification performance of the prototype aerogel RICH counter for the Belle II experiment Iwata, S. (Author)Korpar, Samo (Author)Križan, Peter (Author)Pestotnik, Rok (Author)Šantelj, Luka (Author)Seljak, Andrej (Author)Tahirović, Elvedin (Author), et al. Progress_of_Theoretical_and_Experimental_Physics_2016_Iwata_et_al._Particle_identification_performance_of_the_prototype_aerogel_RICH_cou.pdf (1,57 MB)  https://academic.oup.com/ptep/article-lookup/doi/10.1093/ptep/ptw005 English Scientific work (r2) 1.01 - Original Scientific Article FKKT - Faculty of Chemistry and Chemical Engineering We have developed a new type of particle identification device, called an aerogel ring imaging Cherenkov (ARICH) counter, for the Belle II experiment. It uses silica aerogel tiles as Cherenkov radiators. For detection of Cherenkov photons, hybrid avalanche photo-detectors (HAPDs) are used. The designed HAPD has a high sensitivity to single photons under a strong magnetic field. We have confirmed that the HAPD provides high efficiency for single-photon detection even after exposure to neutron and $\gamma$-ray radiation that exceeds the levels expected in the 10-year Belle II operation. In order to confirm the basic performance of the ARICH counter system, we carried out a beam test at the using a prototype of the ARICH counter with six HAPD modules. The results are in agreement with our expectations and confirm the suitability of the ARICH counter for the Belle II experiment. Based on the in-beam performance of the device, we expect that the identification efficiency at $3.5\,{\rm GeV}/c$ is 97.4% and 4.9% for pions and kaons, respectively. This paper summarizes the development of the HAPD for the ARICH and the evaluation of the performance of the prototype ARICH counter built with the final design components. H14, elementary particle physics, particle detectors, Belle II detector, ring imaging Cherenkov counters, RICH counters 2016 str. 1-16 št. 3, Letn. 2016 2050-3911 539.1.074 2050-3911 2941284 10.1093/ptep/ptw005 URN:SI:UM:DK:R3GHFCKP This work is available under this license: Creative Commons Attribution 4.0 International 381 244 Misc.

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## Record is a part of a journal

Title: Progress of Theoretical and Experimental Physics Prog. Theor. Exp. Phys. Oxford University Press 2050-3911 2704635

## Secondary language

Language: Slovenian H14, fizika osnovnih delcev, detektorji delcev, detektor Belle II, števci 'ring imaging Cherenkov', števci RICH