Technical design of the phase I Mu3e experiment

K. Arndt, H. Augustin, P. Baesso, N. Berger, F. Berg, C. Betancourt, D. Bortoletto, A. Bravar, K. Briggl, D. vom Bruch, A. Buonaura, F. Cadoux (+94 others)
<span title="">2021</span> <i title="Deutsches Elektronen-Synchrotron, DESY, Hamburg"> Nuclear instruments &amp; methods in physics research / A 1014 </i> &nbsp;
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
more &raquo; ... 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.
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="">doi:10.3204/pubdb-2022-00370</a> <a target="_blank" rel="external noopener" href="">fatcat:b3cwkavgyndzlbqrobnn6dykwa</a> </span>
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