18-19 June 2018
Fermilab, Wilson Hall
US/Central timezone
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Contribution Oral Presentation

Fermilab, Wilson Hall - One West

Design of the Mu2e Straw Tracker


  • Kate CIAMPA

Primary authors


Mu2e will search for the neutrinoless conversion of a muon to an electron in the presence of a nucleus, µ+N(A,Z) -> e+N(A,Z), more commonly known as charged lepton flavor violation (CLFV). A decay of this sort is extremely suppressed in the Standard Model, on the order 10^{-54}. A process of this kind may never be observed in a lab so detecting it would be an unambiguous evidence of new physics.

New physics models predict a muon-to-electron conversion rate of order 10^{-14} – 10^{-16}. There are many experiments looking for a flavor-violating muon in the presence of a nucleus. Mu2e is improving the current limit set by these experiments by 4 orders of magnitude to reach a single event sensitivity of 3×10^{-17}. This sensitivity will help reduce the number of possible new physics theories to lead us to the correct one. Achieving the 10,000-fold improvement requires a tracker that is very efficient at separating background events from signal events and can reduce the background to less than half an event over the three-year run period. In this talk we will focus on the design challenges of the tracker and how we overcame them. A low mass tracker to minimize the energy loss of the electrons as they propagate through it and a momentum resolution better than 180 keV/c are just two of such challenges. Also, we will mention the stages a signal electron will go through from the moment of its birth near an aluminum nucleus to its eventual resting place in the shielding behind the detector.