# The calorimeter of the Mu2e experiment at Fermilab

## TL;DR

The paper discusses the design, testing, and expected performance of the calorimeter component of the Mu2e experiment, which aims to detect rare muon-to-electron conversion events indicating new physics beyond the Standard Model.

## Contribution

It presents the first qualification tests and performance evaluations of the Mu2e calorimeter components, demonstrating their suitability for the experiment's challenging environment.

## Key findings

- Calorimeter components meet energy and time performance requirements.
- Prototype tests confirm operation in high radiation and magnetic fields.
- Simulation results align with beam test measurements.

## Abstract

The Mu2e experiment at Fermilab looks for Charged Lepton Flavor Violation (CLFV) improving by 4 orders of magnitude the current experimental sensitivity for the muon to electron conversion in a muonic atom. A positive signal could not be explained in the framework of the current Standard Model of particle interactions and therefore would be a clear indication of new physics. In 3 years of data taking, Mu2e is expected to observe less than one background event mimicking the electron coming from muon conversion. Achieving such a level of background suppression requires a deep knowledge of the experimental apparatus: a straw tube tracker, measuring the electron momentum and time, a cosmic ray veto system rejecting most of cosmic ray background and a pure CsI crystal calorimeter, that will measure time of flight, energy and impact position of the converted electron. The calorimeter has to operate in a harsh radiation environment, in a 10-4 Torr vacuum and inside a 1 T magnetic field. The results of the first qualification tests of the calorimeter components are reported together with the energy and time performances expected from the simulation and measured in beam tests of a small scale prototype.