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Technical design of the phase I Mu3e experiment

  • Arndt, K
  • Augustin, H
  • Baesso, P
  • Berger, N
  • Berg, F
  • Betancourt, C
  • Bortoletto, D
  • Bravar, A
  • Briggl, K
  • vom Bruch, D
  • Buonaura, A
  • Cadoux, F
  • Chavez Barajas, C
  • Chen, H
  • Clark, K
  • Cooke, P
  • Corrodi, S
  • Damyanova, A
  • Demets, Y
  • Dittmeier, S
  • And 80 more
Publication Date
Oct 21, 2021
UCL Discovery
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The Mu3e experiment aims to find or exclude the lepton flavour violating decay μ→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 108 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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