The Mu2e crystal calorimeter
Abstract
The Mu2e Experiment at Fermilab will search for coherent, neutrino-less conversion of negative muons into electrons in the field of an Aluminum nucleus, μ- + Al → e- +Al. Data collection start is planned for the end of 2021. The dynamics of such charged lepton flavour violating (CLFV) process is well modelled by a two-body decay, resulting in a mono-energetic electron with an energy slightly below the muon rest mass. If no events are observed in three years of running, Mu2e will set an upper limit on the ratio between the conversion and the capture rates Rμe = μ- + A(Z,N) → e- +A(Z,N)/μ- + A(Z,N) → νμ- +A(Z-1,N) of ≤ 6 ×10-17 (@ 90% C.L.). This will improve the current limit of four order of magnitudes with respect to the previous best experiment. Mu2e complements and extends the current search for μ → e γ decay at MEG as well as the direct searches for new physics at the LHC . The observation of such CLFV process could be clear evidence for New Physics beyond the Standard Model. Given its sensitivity, Mu2e will be able to probe New Physics at a scale inaccessible to direct searches at either present or planned high energy colliders. To search for the muon conversion process, a very intense pulsed beam of negative muons (~ 1010 μ/ sec)more »
- Authors:
-
- INFN Lab. Nazionali di Frascati, Frascati (Italy). et al.
- Publication Date:
- Research Org.:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Org.:
- Mu2e collaboration
- OSTI Identifier:
- 1409354
- Report Number(s):
- FERMILAB-PUB-17-519-PPD
Journal ID: ISSN 1748-0221; 1624114
- Grant/Contract Number:
- AC02-07CH11359
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Instrumentation
- Additional Journal Information:
- Journal Volume: 12; Journal Issue: 09; Journal ID: ISSN 1748-0221
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Calorimeters; Particle identification methods; Photon detectors for UV, visible and IR photons (solid-state)
Citation Formats
Happacher, Fabio. The Mu2e crystal calorimeter. United States: N. p., 2017.
Web. doi:10.1088/1748-0221/12/09/P09017.
Happacher, Fabio. The Mu2e crystal calorimeter. United States. https://doi.org/10.1088/1748-0221/12/09/P09017
Happacher, Fabio. Fri .
"The Mu2e crystal calorimeter". United States. https://doi.org/10.1088/1748-0221/12/09/P09017. https://www.osti.gov/servlets/purl/1409354.
@article{osti_1409354,
title = {The Mu2e crystal calorimeter},
author = {Happacher, Fabio},
abstractNote = {The Mu2e Experiment at Fermilab will search for coherent, neutrino-less conversion of negative muons into electrons in the field of an Aluminum nucleus, μ- + Al → e- +Al. Data collection start is planned for the end of 2021. The dynamics of such charged lepton flavour violating (CLFV) process is well modelled by a two-body decay, resulting in a mono-energetic electron with an energy slightly below the muon rest mass. If no events are observed in three years of running, Mu2e will set an upper limit on the ratio between the conversion and the capture rates Rμe = μ- + A(Z,N) → e- +A(Z,N)/μ- + A(Z,N) → νμ- +A(Z-1,N) of ≤ 6 ×10-17 (@ 90% C.L.). This will improve the current limit of four order of magnitudes with respect to the previous best experiment. Mu2e complements and extends the current search for μ → e γ decay at MEG as well as the direct searches for new physics at the LHC . The observation of such CLFV process could be clear evidence for New Physics beyond the Standard Model. Given its sensitivity, Mu2e will be able to probe New Physics at a scale inaccessible to direct searches at either present or planned high energy colliders. To search for the muon conversion process, a very intense pulsed beam of negative muons (~ 1010 μ/ sec) is stopped on an Aluminum target inside a very long solenoid where the detector is also located. The Mu2e detector is composed of a straw tube tracker and a CsI crystals electromagnetic calorimeter. An external veto for cosmic rays surrounds the detector solenoid. In 2016, Mu2e has passed the final approval stage from DOE and has started its construction phase. As a result, an overview of the physics motivations for Mu2e, the current status of the experiment and the required performances and design details of the calorimeter are presented.},
doi = {10.1088/1748-0221/12/09/P09017},
journal = {Journal of Instrumentation},
number = 09,
volume = 12,
place = {United States},
year = {Fri Sep 15 00:00:00 EDT 2017},
month = {Fri Sep 15 00:00:00 EDT 2017}
}
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