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Published October 15, 2013 | Submitted
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The next generation of µ → eγ and µ → 3e CLFV search experiments


We explore the possibilities for extending the sensitivity of current searches for the charged lepton flavor violating decays µ → eγ and µ → eee. A future facility such as Project X at Fermilab could provide a much more intense stopping µ^+ beam, facilitating more sensitive searches, but improved detectors will be required as well. Current searches are limited by accidental and physics backgrounds, as well as by the total number of stopped muons. One of the limiting factors in current detectors for µ → eγ searches is the photon energy resolution of the calorimeter. We present a new fast Monte Carlo simulation of a conceptual design of a new experimental concept that detects converted e^+e^- pairs from signal photons, taking advantage of the improved energy resolution of a pair spectrometer based on a silicon charged particle tracker. We also study a related detector design for a next generation µ → eee search experiment.

Additional Information

We acknowledge helpful discussions with Fritz Dejongh and Franco Grancagnolo. This work was supported in part by the US Department of Energy under grant DE-FG02-92ER40701.

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Submitted - 1309.7679v1.pdf


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October 25, 2023