Fabrication of a Cosmic Ray Veto System for the Mu2e Experiment

TL;DR

The paper details the design and fabrication of a highly efficient cosmic ray veto system for the Mu2e experiment, crucial for reducing background noise to detect rare muon-to-electron decay events.

Contribution

It introduces the design and fabrication process of the Mu2e Cosmic Ray Veto system with 99.99% efficiency in a high-intensity environment.

Findings

Achieved 99.99% veto efficiency

Designed for low dead time

Operates effectively in high-intensity conditions

Abstract

The Mu2e experiment at Fermilab will search for the charged-lepton flavor-violating process of a neutrino less muon-to-electron decay in the presence of a nucleus. The experiment expects a single-event sensitivity of $2.9\times10^{-17}$, which is four orders of magnitude below the current strongest limits on this process. This requires all backgrounds to sum to fewer than one event over the lifetime of the experiment. One major background is due to cosmic-ray muons producing electrons that fake a signal inside of the Mu2e apparatus. The Mu2e Cosmic Ray Veto (CRV) has been designed to veto these cosmic-ray backgrounds with an efficiency of 99.99%, while causing a low dead time and while operating in a high-intensity environment. The design and fabrication of the CRV is discussed.