Journal
Publisher
ELSEVIER
DOI: 10.1016/j.nima.2021.165679
Keywords
Lepton flavour violation; Muon decays; Monolithic pixel detector; Scintillating fibres; Scintillating tiles
Categories
Funding
- German Research Foundation (DFG) [GK 2058, GK 1994, SCHO 1443/2-1]
- EU International Training Network PicoSec [PITN-GA-2011-289355-PicoSEC-MCNet]
- International Max Planck Research School for Precision Tests of Fundamental Symmetries (IMPRS-PTFS), Germany
- Heinz-Gotze-Stiftung, Germany
- Cluster of Excellence Precision Physics, Fundamental Interactions, and Structure of Matter'' - German Research Foundation (DFG) within the German Excellence Strategy [PRISMA EXC 1098, PRISMA+ EXC 2118/1, 39083149]
- Swiss National Science Foundation [200021_137738, 200021_165568, 200021_172519, 200021_182031, 20020_172706]
- Ernest Boninchi Foundation in Geneva
- Science and Technology Facilities Council, UK [ST/P00282X/1, ST/P002765/1, ST/P002730/1, ST/P002870/1]
- Royal Society, UK [UF140598, RGF\EA\180081]
- Swiss National Science Foundation (SNF) [200021_137738, 200021_165568, 200021_172519] Funding Source: Swiss National Science Foundation (SNF)
- STFC [ST/P002765/1, ST/P00282X/1, ST/P002870/1, ST/P002730/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/S000879/1, ST/V005952/1, ST/P00282X/1] Funding Source: researchfish
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The Mu3e experiment aims to find or exclude lepton flavour violating decay mu -> eee with a branching fraction above 10(-16). The first phase of the experiment at the PSI is designed to reach a single event sensitivity of 2.10(-15). The unique challenges posed by the high rate of muon decays and low momenta of decay electrons and positrons are addressed using an ultra thin tracking detector based on high-voltage monolithic active pixel sensors combined with scintillating fibres and tiles for precise timing measurements.
The Mu3e experiment aims to find or exclude the lepton flavour violating decay mu -> eee at branching fractions above 10(-16). A first phase of the experiment using an existing beamline at the Paul Scherrer Institute (PSI) is designed to reach a single event sensitivity of 2.10(-15). We present an overview of all aspects of the technical design and expected performance of the phase I Mu3e detector. The high rate of up to 10(8) muon decays per second and the low momenta of the decay electrons and positrons pose a unique set of challenges, which we tackle using an ultra thin tracking detector based on high-voltage monolithic active pixel sensors combined with scintillating fibres and tiles for precise timing measurements.
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