Speaker
Description
The Mu3e experiment will search for the charged lepton flavour violating decay $\mu \rightarrow e^+ e^- e^+$ and is based at the Paul Scherrer Institute (PSI). It aims to achieve a sensitivity of one in $\mathcal{O}(10^{15})$ moun decays in phase 1 and one in $10^{16}$ muon decays in phase 2, which is four orders of magnitude more sensitive than the previous measurement conducted by the SINDRUM experiment. Any observation of this decay would be a clear sign for new physics, since it is highly suppressed in the Standard Model to a branching ratio of below $\mathcal{O}(10^{-54})$.
The Mu3e detector will use four layers of thin Mupix sensors (high voltage monolithic active pixel sensors, HV-MAPS) to track electrons and positrons. A time resolution of O(100ps) will be provided by scintillating tile and fibre detectors, which are coupled to SiPMs and read out by the Mutrig chip. A FPGA-based, triggerless DAQ system will collect data from these detectors, which will then be reconstructed in a GPU filter farm.
With Mupix11 and Mutrig3 the sensor developement for phase 1 has concluded and the collaboration has performed engineering runs with a fist prototype of the inner detector region in order to validate a variety of systems and to identify potential issues. With the experience gained from the engineering runs the collaboration is now in the process of constructing the phase 1 detector.
The talk will present the design of the detecor and readout system and discuss the ongoing activities for Mu3e phase 1.
