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arxiv: 2009.11690 · v3 · pith:KD4QEP2Anew · submitted 2020-09-24 · ⚛️ physics.ins-det · hep-ex

Technical design of the phase I Mu3e experiment

classification ⚛️ physics.ins-det hep-ex
keywords experimentmu3ephasedecaydesigndetectortechnicalabove
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The Mu3e experiment aims to find or exclude the lepton flavour violating decay $\mu \rightarrow eee$ 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 $2\cdot 10^{-15}$. 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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