000002529 001__ 2529
000002529 005__ 20210701141449.0
000002529 037__ $$aBELLE2-PTHESIS-2021-014
000002529 041__ $$aeng
000002529 100__ $$aManca Mrvar
000002529 245__ $$aCalibration of aerogel ring-imaging Cherenkov detector in Belle II spectrometer
000002529 260__ $$aLjubljana, Slovenia$$bUniversity of Ljubljana$$c2019
000002529 300__ $$amult. p
000002529 500__ $$aPresented on 10 01 2019
000002529 502__ $$aPhD$$bLjubljana, Slovenia, University of Ljubljana$$c2019
000002529 520__ $$aThe Aerogel Ring-Imaging Cherenkov (ARICH) detector provides a charged particle identification in the endcap region of the Belle II spectrometer at the SuperKEKB asymmetric-energy e + e − collider in Tsukuba, Japan. The ARICH consists of a double layer aerogel radiator in a focusing configuration, an expansion volume and a plane of hybrid avalanche photodetectors. The methods of the calibration of the photodetectors and the readout electronics are discussed in the dissertation. The hardware calibration improved the separation of charged kaons and pions, which was studied with the D ∗+ → D 0 (→ K − π + )π s + decay. The identification algorithm was tested on the simulated sample. The simulation results show the efficiency of the kaon identification above 90 % at the pion misidentification probability of 5 %. The developed procedure was also applied to the sample of collision data that was collected during the detector commissioning phase. Due to limited sample of the measured data, only the reconstructed D 0 → K − π + events were used for the performance studies. The results provide slightly decreased performance due to incomplete calibration of the tracking and particle identification system at the beginning of the operation.
000002529 8560_ $$fmanca.mrvar@oeaw.ac.at
000002529 8564_ $$uhttps://docs.belle2.org/record/2529/files/BELLE2-PTHESIS-2021-014.pdf
000002529 980__ $$aTHESIS