A review summarizing recent progress in high-intensity polarized muon beams for precision muonium physics, new physics searches, and materials science applications.
New constraint on the existence of the mu+-> e+ gamma decay
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abstract
The analysis of a combined data set, totaling 3.6 \times 10^14 stopped muons on target, in the search for the lepton flavour violating decay mu^+ -> e^+ gamma is presented. The data collected by the MEG experiment at the Paul Scherrer Institut show no excess of events compared to background expectations and yield a new upper limit on the branching ratio of this decay of 5.7 \times 10^-13 (90% confidence level). This represents a four times more stringent limit than the previous world best limit set by MEG.
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Muon beams towards muonium physics: progress and prospects
A review summarizing recent progress in high-intensity polarized muon beams for precision muonium physics, new physics searches, and materials science applications.