Recent developments in software for the Belle II aerogel RICH

• DOI: 10.1016/j.nima.2017.02.017
• Publication Date: 2017-02-09T05:00:45Z
• Authors: L. Šantelj; I. Adachi; R. Dolenec; K. Hataya; S. Iori; S. Iwata; H. Kakuno; R. Kataura; H. Kawai; H. Kindo; T. Kobayashi; S. Korpar; P. Križan; T. Kumita; M. Mrvar; S. Nishida; K. Ogawa; S. Ogawa; R. Pestotnik; T. Sumiyoshi; M. Tabata; M. Yonenaga; Y. Yusa
• Keywords: Radiator (engine cooling); Cherenkov detector

Abstract For the Belle II spectrometer a proximity focusing RICH counter with an aerogel radiator (ARICH) will be employed as a PID system in the forward end-cap region of the spectrometer. The detector will provide about 4 σ separation of pions and kaons up to momenta of 3.5 GeV/ c , at the kinematic limits of the experiment. We present the up-to-date status of the ARICH simulation and reconstruction software, focusing on the recent improvements of the reconstruction algorithms and detector description in the Geant4 simulation. In addition, as a demonstration of detector readout software functionality we show the first cosmic ray Cherenkov rings observed in the ARICH.