# 2019 Meeting of the Division of Particles & Fields of the American Physical Society

July 29, 2019 to August 2, 2019
Northeastern University
US/Eastern timezone

## A Cosmic Ray Veto Detector for the Mu2e Experiment at Fermila

Jul 31, 2019, 2:00 PM
18m
West Village G 108 (Northeastern University)

### West Village G 108

#### Northeastern University

Oral Presentation Particle Detectors

### Speaker

Ralf Ehrlich (Fermi National Accelerator Laboratory)

### Description

The Mu2e experiment is designed to search for the charged-lepton-flavor-violating
process, $\mu^-$ to a $e^-$, with unprecedented sensitivity. The single 105-MeV
electron that results from this process can be mimicked by cosmic-ray muons or their
products entering the detector. An active veto detector surrounding the apparatus
is used to detect incoming cosmic-ray muons. To reduce the backgrounds to the required
level it must have an average efficiency of 99.99\% and excellent hermeticity over a
large area. The detector consists of four layers of scintillator counters, each with
two embedded wavelength-shifting fibers, whose light is detected by silicon photomultipliers.
The design and expected performance of the cosmic ray veto detector will be described.

### Primary authors

Prof. E. Craig Dukes (University of Virginia) Ralf Ehrlich (Fermi National Accelerator Laboratory)

### Presentation materials

 The Mu2e CRV.pdf The Mu2e CRV.pptx