A Tracker for the Mu3e Experiment based on High-Voltage Monolithic Active Pixel Sensors

Abstract

The Mu3e experiment searches for the lepton flavour violating decay mu+ -> e+e-e+, aiming for a branching fraction sensitivity of 10^-16. This requires an excellent momentum resolution for low energy electrons, high rate capability and a large acceptance. In order to minimize multiple scattering, the amount of material has to be as small as possible. These challenges can be met with a tracker built from high-voltage monolithic active pixel sensors (HV-MAPS), which can be thinned to 50 um and which incorporate the complete read-out electronics on the sensor chip. To further minimise material, the sensors are supported by a mechanical structure built from 25 um thick Kapton foil and cooled with gaseous helium.

4 pages, 10 figures

References in corpus (2)

• Research Proposal for an Experiment to Search for the Decay μ -> eee
• Space-Charge Effects in an Ungated GEM-based TPC

Cited by in corpus (9)

• The MuPix System-on-Chip for the Mu3e Experiment
• A New Three-Dimensional Track Fit with Multiple Scattering
• The Quest for $\mu \to e\gamma$ and its Experimental Limiting Factors at Future High Intensity Muon Beams
• Status of the Mu3e Experiment at PSI
• Multiple Coulomb Scattering in Thin Silicon
• Efficiency and timing performance of the MuPix7 high-voltage monolithic active pixel sensor
• Three-Dimensional Triplet Tracking for LHC and Future High Rate Experiments
• The Quest for $\mu \to e\gamma$ and its Experimental Limiting Factors at Future High Intensity Muon Beams
• A New Track Reconstruction Algorithm suitable for Parallel Processing based on Hit Triplets and Broken Lines