The 24th International Workshop on Neutrinos From Accelerators (NuFact 2023)

Status of Mu3e Phase 1

22 Aug 2023, 14:30

30m

Natural Science Lecture Center (building-28), Seoul National University, Korea

Oral WG4: Muon Physics parallel (room#301)

Speaker

Martin Müller (JGU Mainz)

Description

The Mu3e experiment will search for the charged lepton flavour violating decay $\mu \to e^{+}{e}^{-}{e}^{+}$ 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.

Presentation materials

NuFact2023_Mu3e.pdf