Abstract
The experiment aims for a single event sensitivity of 2\cdot 10^{-15}2⋅10−15 on the charged lepton flavour violating \mu^+\rightarrow e^+ e^+ e^-μ+→e+e+e− decay. The experimental apparatus, a light-weight tracker based on custom High-Voltage Monolithic Active Pixel Sensors placed in a 1 T magnetic field is currently under construction at the Paul Scherrer Institute, where it will fully use the intense 10^88\mu^+μ+/s beam available. A final sensitivity of 1 \cdot 10^{-16}1⋅10−16 is envisioned for a phase II experiment, driving the development of a new high-intensity continuous muon source which will deliver >10^99\mu^+μ+/s to the experiment.
Highlights
Searches for Charged Lepton Flavour Violation (CLFV) in muon decays are a remarkably sensitive method to search for new physics processes [1]
A new generation of experiments pursuing these three golden channels, which probe for new physics in a complementary manner [5], is currently under construction: the Mu2e experiment at Fermilab, the COMET experiment at J-PARC, and the M EG I I experiment at Paul Scherrer Institute (PSI)
The Mu3e experiment aims for a 10−16 single-event sensitivity for the μ+ → e+e+e− CLFV decay channel, an improvement by four orders of magnitude compared to the limit set by the SINDRUM experiment [3]
Summary
Searches for Charged Lepton Flavour Violation (CLFV) in muon decays are a remarkably sensitive method to search for new physics processes [1]. The Mu3e experiment aims for a 10−16 single-event sensitivity for the μ+ → e+e+e− CLFV decay channel, an improvement by four orders of magnitude compared to the limit set by the SINDRUM experiment [3] Such a leap in sensitivity is enabled by the availibility of high-intensity muon beams, the use of silicon pixel detectors instead of multi-wire proportional chambers to track the decay products, and a modern data-aqcuisition system able to handle the vast amount of data producted by the detector at high beam rates. The dominating accidental background originates from the overlay of two ordinary muon decays where one of the positrons produces an additional electron track through Bhabha scattering in the target material This process is sufficiently suppressed by means of a good vertex resolution of better than 300 μm, a timing resolution of a few 100 ps, the requirement of an invariant mass equal to the muon mass, and a balanced momentum budget.
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