The Mu3e Data Acquisition

• Published in: arXiv.org 2021-01
• Main Authors: Augustin, Heiko, Berger, Niklaus, Bravar, Alessandro, Briggl, Konrad, Chen, Huangshan, Corrodi, Simon, Dittmeier, Sebastian, Gayther, Ben, Gerritzen, Lukas, Gottschalk, Dirk, Hartmann, Ueli, Hesketh, Gavin, Köppel, Marius, Kilani, Samer, Kozlinskiy, Alexandr, Frank Meier Aeschbacher, Müller, Martin, Munwes, Yonathan, Ann-Kathrin Perrevoort, Ritt, Stefan, Schöning, André, Schultz-Coulon, Hans-Christian, Shen, Wei, Vigani, Luigi, Dorothea vom Bruch, Wauters, Frederik, Wiedner, Dirk, Zhong, Tiancheng
• Format: Article
• Language: English
• Subjects: Active pixel sensors; Algorithms; Apexes; Experiments; Flavors; Graphics processing units; Leptons; Muons; Particle beams; Pixels; Systems design
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2010.15648

The Mu3e experiment aims to find or exclude the lepton flavour violating decay \(\mu^+\to e^+e^-e^+\) with a sensitivity of one in 10\(^{16}\) muon decays. The first phase of the experiment is currently under construction at the Paul Scherrer Institute (PSI, Switzerland), where beams with up to 10\(^8\) muons per second are available. The detector will consist of an ultra-thin pixel tracker made from High-Voltage Monolithic Active Pixel Sensors (HV-MAPS), complemented by scintillating tiles and fibres for precise timing measurements. The experiment produces about 100 Gbit/s of zero-suppressed data which are transported to a filter farm using a network of FPGAs and fast optical links. On the filter farm, tracks and three-particle vertices are reconstructed using highly parallel algorithms running on graphics processing units, leading to a reduction of the data to 100 Mbyte/s for mass storage and offline analysis. The paper introduces the system design and hardware implementation of the Mu3e data acquisition and filter farm.