Design, R&D and status of the crystal calorimeter for the Mu2e experiment

TL;DR

The paper discusses the design, development, and current status of the crystal calorimeter for the Mu2e experiment, which aims to detect rare muon-to-electron conversion events with unprecedented sensitivity.

Contribution

It presents the design and development progress of the Mu2e electromagnetic calorimeter, a key component for detecting rare charged lepton flavor violation events.

Findings

Calorimeter design meets experimental requirements.

Prototype tests demonstrate expected performance.

Project is progressing towards full implementation.

Abstract

The Mu2e Experiment at Fermilab will search for coherent, neutrinoless conversion of muons into electrons in the field of a nucleus, with a sensitivity improvement of a factor of 10^4 over previous experiments. Such a charged lepton flavor-violating reaction probes new physics at a scale inaccessible with direct searches at either present or planned high energy colliders. The conversion electron is mono-energetic with an energy slightly below the muon rest mass. If no events are observed in three years of running, Mu2e will set a limit on the ratio between the conversion rate and the capture rate, R_{\mu e}, of < 6 x 10^{-17} (@ 90% CL). In this paper, the physics motivation for Mu2e and the current status of the electromagnetic calorimeter project are briefly presented.