Advances in High Energy Physics

Review Article

Lepton Flavour Violation Experiments

Table 2

The performances of recent experiments, compared with the best limit set by MEG [92] and the expected sensitivy obtainable at the end of MEG running and (later on) of its upgrade stage [94]. All quoted resolutions are FWHM. *shows an average of the numbers given in [88, 89]; **is the predicted C.L. sensitivity.
Place, experiment Year (ns) (mrad) Upper limit Reference
SIN 1977 8.7% 9.3% — <1.0 × 10−9 [84]
TRIUMF 1977 10% 8.7% — <3.6 × 10−9 [85]
LANL 1979 8.8% 8% <1.7 × 10−10 [86]
LANL-crystal box 1986 % 8% <4.9 × 10−11 [87]
LANL-MEGA 1999 1.2%* 4.5%* <1.2 × 10−11 [88, 89]
PSI-MEG 2013 1.7% 5.4% <5.7 × 10−13 [92]
PSI-MEG 2014 1.7% 5.4% <5 ×   [94]
PSI-MEG upgrade 2017 0.5% 3.4% <5 ×   [94]