研究目的
To look for a lepton flavor violating μ + → e+γ decay with an unprecedented sensitivity and improve detector components for enhanced sensitivity in the MEG II experiment.
研究成果
The MEG II upgrade aims to achieve a sensitivity of 5 × 10?14 for the μ + → e+γ decay branching ratio, ten times better than the current MEG. Improvements in the LXe calorimeter and pixelated timing counter will enhance resolutions and reduce backgrounds, with detector components to be ready by 2015 for physics runs from 2016 to 2018.
研究不足
The current detector is limited by non-uniform PMT coverage and accidental backgrounds. Challenges include developing VUV-sensitive MPPCs, handling high beam rates, and optimizing counter geometry for timing resolution. Potential areas for optimization include further reducing waveform tails and improving gain uniformity.
1：Experimental Design and Method Selection:
The experiment involves upgrading the MEG detector to improve resolutions and reduce accidental backgrounds. Key components include a liquid xenon (LXe) calorimeter and a pixelated timing counter. Methods include replacing PMTs with MPPCs for better granularity and optimizing layouts.
2：Sample Selection and Data Sources:
Uses a high-intensity muon beam from the PSI accelerator, with data from previous MEG experiments and simulations for performance predictions.
3：List of Experimental Equipment and Materials:
Includes liquid xenon (900 L), PMTs, MPPCs (e.g., Hamamatsu MPPCs, AdvanSiD SiPMs), scintillators (e.g., BC418, BC422), and electronics for readout.
4：Experimental Procedures and Operational Workflow:
Involves installing new photosensors, testing prototypes (e.g., with 100 L LXe), conducting beam tests (e.g., at Daφne facility), and measuring characteristics at LXe temperature (165 K).
5：Data Analysis Methods:
Uses Monte Carlo simulations for performance estimates, statistical techniques for resolution calculations, and waveform analysis for timing measurements.
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