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Calibration of Scintillation Detectors in the MEG II Experiment

  • Author(s): Milgie, Michael James
  • Advisor(s): Taborek, Peter;
  • Molzon, William R
  • et al.
Creative Commons 'BY' version 4.0 license

The Mu to E Gamma (MEG) II experiment is designed to increase the sensitivity of the original MEG experiment by an order of magnitude in the search of the μ+ Þ e+ g decay that violates lepton flavor conservation, which is not allowed [1]. The final results of the original MEG experiment at the Paul Scherrer Institut (PSI) during the period of 2009-2013 produced 7.5 x 10^14 muons stopped on target, and put a new upper limit on the branching ratio of this decay of b(μ+ Þ e+ g) < 4.2x10^-13 [2]. The MEG II upgrade features the world’s most intense DC muon beam, innovative liquid xenon tank (LXe) g-ray detectors, and many sophisticated calibration methods [3,4]. One vital method being implemented to calibrate the 4092 scintillation detectors inside the LXe is the use of our novel X-ray beam. Two additional methods have been introduced to crosscheck the alignment of the LXe detectors. In this thesis we present an overview of the MEG II experiment, the constraints on our alignment device, the design, alignment procedure, and results of this new calibration device.

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