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  • Technical design of the phase I Mu3e experiment
    Augustin, H; Baesso, P; Berger, N; Berg, F; Betancourt, C; Bortoletto, D; Bravar, A; Briggl, K; D vom Bruch; Buonaura, A; Cadoux, F; C Chavez Barajas; Chen, H; Clark, K; Cooke, P; Corrodi, S; Damyanova, A; Demets, Y; Dittmeier, S; Eckert, P; Ehrler, F; Fahrni, D; Gagneur, S; Gerritzen, L; Gottschalk, D; Grab, C; Gredig, R; Groves, A; Hammerich, J; Hartmann, U; Hayward, H; Herkert, A; Hesketh, G; Hetzel, S; Hildebrandt, M; Hodge, Z; Hofer, A; Huang, Q H; Hughes, S; Huth, L; Immig, D M; Jones, T; Jones, M; H -C Kästli; Köppel, M; P -R Kettle; Kiehn, M; Kilani, S; Klingenmeyer, H; Knecht, A; Knight, A; Kotlinski, B; Kozlinskiy, A; Leys, R; Lockwood, G; Loreti, A; La Marra, D; Müller, M; Meier, B; F Meier Aeschbacher; Meneses, A; Metodiev, K; Mtchedlishvili, A; Muley, S; Munwes, Y; Noehte, L O S; Owen, P; Papa, A; Paraskevas, I; Períc, I; A -K Perrevoort; Plackett, R; Pohl, M; Ritt, S; Robmann, P; Rompotis, N; Rudzki, T; Rutar, G; Schöning, A; Schimassek, R; H -C Schultz-Coulon; Serra, N; Shen, W; Shipsey, I; Shrestha, S; Steinkamp, O; Stoykov, A; Straumann, U; Streuli, S; Tata, N; Velthuis, J; Vigani, L; Vilella-Figueras, E; Vossebeld, J; Wallny, R; Wasili, A; Wauters, F; Wiedner, D; Windelband, B; Zhong, T

    arXiv.org, 08/2021
    Paper, Journal Article

    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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