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, C. Chavez Barajas, S. Corrodi, A. Damyanova, Y. Demets, S. Dittmeier, P. Eckert, F. Ehrler, D. FahrniS. Gagneur, L. Gerritzen, J. Goldstein, D. Gottschalk, C. Grab, R. Gredig, A. Groves, J. Hammerich, U. Hartenstein, A. Herkert, G. Hesketh, M. Hildebrandt, Z. Hodge, A. Hofer, L. Huth, D. M. Immig, H. -C. Kästli, M. Köppel, P. -R. Kettle, M. Kiehn, S. Kilani, H. Klingenmeyer, A. Knecht, B. Kotlinski, A. Kozlinskiy, R. Leys, G. Lockwood, A. Loreti, D. La Marra, B. Meier, F. Meier Aeschbacher, A. Meneses, K. Metodiev, A. Mtchedlishvili, S. Muley, Y. Munwes, L. O. S. Noehte, P. Owen, A. Papa, I. Paraskevas, I. Períc, A. -K. Perrevoort, R. Plackett, M. Pohl, S. Ritt, P. Robmann, N. Rompotis, T. Rudzki, G. Rutar, A. Schöning, R. Schimassek, H. -C. Schultz-Coulon, N. Serra, W. Shen, I. Shipsey, O. Steinkamp, A. Stoykov, U. Straumann, S. Streuli, K. Stumpf, N. Tata, J. Velthuis, L. Vigani, E. Vilella-Figueras, J. Vossebeld, R. Wallny, A. Wasili, F. Wauters, A. Weber, D. Wiedner, B. Windelband, T. Zhong

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Abstract

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.
Original languageEnglish
Article number165679
Number of pages78
JournalNuclear Instruments and Methods in Physics Research Section A: Vol.
Volume1014
Early online date5 Aug 2021
DOIs
Publication statusPublished - 21 Oct 2021

Bibliographical note

Funding Information:
We gratefully acknowledge the beamtimes provided by the following facilities: test beam facility at DESY Hamburg (Germany), a member of the Helmholtz Association (HGF), ?M1 at Paul Scherrer Institut, Villigen (Switzerland), PS and SPS at CERN, Geneva, (Switzerland), and MAMI A2 and X1 at Institut f?r Kernphysik at the JGU Mainz (Germany). We gratefully acknowledge important contributions to the experiment, made by staff in the mechanical and electrical workshops and cleanroom facilities in all collaborating institutes. The Heidelberg groups acknowledge the support by the German Research Foundation (DFG) funded Research Training Groups HighRR (GK 2058) and ?Particle Physics beyond the Standard Model? (GK 1994), by the EU International Training Network PicoSec (grant no. PITN-GA-2011-289355-PicoSEC-MCNet), by the International Max? Planck Research School for Precision Tests of Fundamental Symmetries (IMPRS-PTFS), Germany and the Heinz-G?tze-Stiftung, Germany. The work of the Mainz group has also been supported by the Cluster of Excellence ?Precision Physics, Fundamental Interactions, and Structure of Matter? (PRISMA EXC 1098 and PRISMA+ EXC 2118/1) funded by the German Research Foundation (DFG) within the German Excellence Strategy (Project ID 39083149). We acknowledge the contributions of the PRISMA Detector laboratory to the development of the DC?DC converters. The Swiss institutes acknowledge the funding support from the Swiss National Science Foundation grants no. 200021_137738,?200021_165568, 200021_172519, 200021_182031 and 20020_172706. The Particle Physics Department (DPNC) of the University of Geneva gratefully acknowledges support from the Ernest Boninchi Foundation in Geneva. The UK institutes thank the Science and Technology Facilities Council, UK for funding their work through the Large Projects scheme, under grant numbers: ST/P00282X/1, ST/P002765/1, ST/P002730/1, ST/P002870/1. N. Berger, S. Shrestha, A. Kozlinskiy, A.-K. Perrevoort, D. vom? Bruch, Q. H. Huang, U. Hartenstein and F. Wauters thank the DFG for funding their work on the Mu3e experiment through the Emmy Noether programme. F. Meier Aeschbacher, I. Peri?, A. Sch?ning and D. Wiedner thank the DFG for funding their work under grant no. SCHO 1443/2-1. G. Hesketh gratefully acknowledges the support of the Royal Society, UK through grant numbers UF140598 and RGF\EA\180081.

Funding Information:
F. Meier Aeschbacher, I. Perić, A. Schöning and D. Wiedner thank the DFG for funding their work under grant no. SCHO 1443/2-1 .

Funding Information:
The work of the Mainz group has also been supported by the Cluster of Excellence “Precision Physics, Fundamental Interactions, and Structure of Matter” (PRISMA EXC 1098 and PRISMA+ EXC 2118/1) funded by the German Research Foundation (DFG) within the German Excellence Strategy (Project ID 39083149 ). We acknowledge the contributions of the PRISMA Detector laboratory to the development of the DC–DC converters.

Funding Information:
G. Hesketh gratefully acknowledges the support of the Royal Society, UK through grant numbers UF140598 and RGF\EA\180081 .

Funding Information:
The Swiss institutes acknowledge the funding support from the Swiss National Science Foundation grants no. 200021_137738 ,  200021_165568 , 200021_172519 , 200021_182031 and 20020_172706 .

Funding Information:
The Particle Physics Department (DPNC) of the University of Geneva gratefully acknowledges support from the Ernest Boninchi Foundation in Geneva .

Funding Information:
N. Berger, S. Shrestha, A. Kozlinskiy, A.-K. Perrevoort, D. vom  Bruch, Q. H. Huang, U. Hartenstein and F. Wauters thank the DFG for funding their work on the Mu3e experiment through the Emmy Noether programme.

Funding Information:
The Heidelberg groups acknowledge the support by the German Research Foundation (DFG) funded Research Training Groups HighRR (GK 2058) and “Particle Physics beyond the Standard Model” (GK 1994), by the EU International Training Network PicoSec (grant no. PITN-GA-2011-289355-PicoSEC-MCNet ), by the International Max  Planck Research School for Precision Tests of Fundamental Symmetries (IMPRS-PTFS), Germany and the Heinz-Götze-Stiftung, Germany .

Funding Information:
The UK institutes thank the Science and Technology Facilities Council, UK for funding their work through the Large Projects scheme, under grant numbers: ST/P00282X/1 , ST/P002765/1 , ST/P002730/1 , ST/P002870/1 .

Publisher Copyright:
© 2021 The Author(s)

Keywords

  • Lepton flavour violation
  • Muon decays
  • Monolithic pixel detector
  • Scintillating fibres
  • Scintillating tiles

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