A novel experiment searching for the lepton flavour violating decay mu -> eee

TL;DR

This paper proposes a new experiment to detect the lepton flavor violating decay mu -> eee with unprecedented sensitivity, using advanced sensor technologies to explore physics beyond the standard model.

Contribution

It introduces a novel experimental setup employing high-voltage monolithic sensors and scintillating fibers to significantly improve detection sensitivity for muon decay.

Findings

Aim to reach sensitivity of 10^-16 for mu -> eee decay

Utilizes thin high-voltage monolithic sensors for precise tracking

Employs scintillating fibers for high-resolution timing

Abstract

Since the discovery of neutrino oscillations it is known that lepton flavour is not conserved. Lepton flavour violating processes in the charged lepton sector have so far however eluded detection; as they are heavily suppressed in the standard model of particle physics, an observation would be a clear signal for new physics and help to understand the source of neutrino masses and CP violation. We propose a novel experiment searching for the decay mu -> eee with the aim of ultimately reaching a sensitivity of 10^-16, an improvement by four orders of magnitude compared to previous experiments. The technologies enabling this step are thin high-voltage monolithic active pixel sensors for precise tracking at high rates with a minimum of material and scintillating fibres for high resolution time measurements.