![]() The experiment will measure R μ e by detecting the conversion electron and measuring its momentum. It is useful to note that the conversion energy in titanium is 104.394 MeV, practically the same value if Mu2e chooses to replace its initial aluminum target with titanium the difference in conversion energy will be small enough that changes to the detector will not be required as a result of that shift. have calculated that the “conversion energy” in aluminum is 104.973 MeV. A stopped muon near the nucleus falls into a muonic 1 s state quickly, in O ( 1 0 - 15 ) sec. Since the nucleus recoils coherently, the outgoing electron is mono-energetic, with an energy of E e = m μ − B − E R, where B is the binding energy and E R the recoil energy of the nucleus. Since no neutrinos are produced, muon-to-electron conversion is not a weak interaction: thus an observation of the process can only come from new physics. Muon-to-electron conversion violates lepton family number, changing a muon to an electron in the field of a nucleus through a coherent interaction with the nucleus. Physics Processes and Experimental Considerations It generally adheres to the design presented in the TDR with occasional updates. the experiment has progressed past that design but it serves to document the experiment at a sufficient level for our purposes. It relies heavily on the Mu2e Technical Design Report (TDR) of Bartoszek et al. We focus on aspects of Mu2e not normally covered in general talks, such as the extinction system and stopping target monitor. Therefore we will examine: (1) experimental considerations: specifically, the most significant backgrounds and how they determine the design of the experiment (2) the formation of the muon beam and the solenoid system used to make it (3) the detector and monitoring systems. Our discussion is envisaged as a middle-ground for graduate students and researchers new to the field. This examination of Mu2e provides an opportunity to complement global review articles, conference presentations, and detailed design reports. We will repeatedly discuss those items and the reader should keep them in mind 1.
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