Speaker
Description
The Mu2e experiment at Fermilab will search for neutrinoless muon-to-electron conversion in the nuclear field using an Al target to stop μ¯. Muons are produced by a resonantly extracted 8 GeV proton beam from the Fermilab delivery ring. The experimental signature of μ¯→e¯ conversion on Al is mono-energetic conversion electrons with 104.97 MeV energy*. Rejection of one of the most important experimental backgrounds coming from muon Decays-In-Orbit (DIO) requires a momentum resolution of <1% FWHM and a momentum scale calibrated to an accuracy of better than 0.1% or 0.1 MeV. Among other momentum scale calibration techniques, the collaboration is considering using 68.9 MeV e+ from π+ → e+nu_e decays of stopped π+. This momentum calibration measurement has a significant background dominated by the muon decays in flight affecting the calibration accuracy. The background can be reduced by placing a thin Ti degrader in front of the stopping target and properly choosing the timing of the measurement. We discuss optimization of the π+ → e+nu_e momentum calibration measurement and present the results.
Footnotes
- https://doi.org/10.3389/fphy.2019.00001
| Region represented | North America |
|---|---|
| Paper preparation format | LaTeX |
