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Calibration of aerogel ring-imaging Cherenkov detector in Belle II spectrometer
Mrvar, Manca (Author), Pestotnik, Rok (Mentor) More about this mentor... This link opens in a new window

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Abstract
The Aerogel Ring-Imaging Cherenkov detector (ARICH) 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 $D^{*+} \to D^0 (\to K^- \pi^+) \pi_s^+$ decay. The identification algorithm was tested on the simulated sample. The simulation results show the efficiency of kaon identification above 90 percent at the pion misidentification probability of 5 percent. The developed procedure was also applied on the sample of collision data that was collected during the detector commissioning phase. Due to limited sample of the measured data, only the reconstructed $D^0 \to K^- \pi^+$ 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.

Language:English
Keywords:The Belle II spectrometer, calibration, Cherenkov photons, the charged kaon/pion separation, hybrid avalanche photodetector, particle identification, Ring-Imaging Cherenkov detector.
Work type:Doctoral dissertation (mb31)
Tipology:2.08 - Doctoral Dissertation
Organization:FMF - Faculty of Mathematics and Physics
Year:2019
COBISS.SI-ID:298460672 Link is opened in a new window
Views:695
Downloads:213
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Secondary language

Language:Slovenian
Title:Umeritev detektorja obročev Čerenkova z aerogelskim sevalcem v spektrometru Belle II
Abstract:
Detektor obročev Čerenkova z aerogelskim sevalcem (ARICH) je namenjen za identifikacijo nabitih delcev v smeri naprej detektorja Belle II ob asimetričnem trkalniku pozitronov in elektronov SuperKEKB, ki stoji v kraju Cukuba na Japonskem. ARICH sestavljajo dvoplastni sevalec iz aerogela, prazen prostor za razširjanje Čerenkovih fotonov in detektorska ravnina s hibridnimi plazovnimi fotodetektorji. V disertaciji je opisana umeritev detektorja, s katero izboljšamo ločevanje nabitih kaonov in pionov, ki jih neodvisno identificiramo pri razpadih $D^{*+} \to D^0 (\to K^- \pi^+) \pi_s^+$. Umeritvene metode in njihov vpliv na izboljšano ločevanje med kaoni in pioni smo preverili na vzorcu dogodkov, dobljenim z računalniško simulacijo. Rezultati simulacije so pokazali, da je z razvito metodo mogoče pravilno identificirati več kot 90 odstotkov kaonov ob zahtevi, da delež napačno identificiranih pionov ni večji od 5 odstotkov. Postopek smo uporabili tudi na vzorcu podatkov, ki smo jih zbrali pri prvih trkih na trkalniku SuperKEKB. Zaradi majhnega vzorca smo odziv detektorja preverili z uporabo rekonstruiranih razpadov $D^0 \to K^- \pi^+$, pri čemer je identifikacija delcev malenkost slabša zaradi nepopolne umeritve sledilnega ter identifikacijskega sistema ob začetku delovanja eksperimenta.

Keywords:Detektor Belle II, fotoni Čerenkova, detektor obročev Čerenkova, hibridni plazovni fotodetektor, identifikacija nabitih delcev, razlikovanje med nabitimi kaoni in pioni, umeritev.

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