tau - Particle Data Group

Citation: K. Nakamura et al. (Particle Data Group), JP G 37, 075021 (2010) and 2011 partial update for the 2012 edition (URL: http://pdg.lbl.gov)
Γ ( μ − K + K −) /Γ total Γ 198 /Γ
Test of lepton family number conservation.
VALUE CL% DOCUMENT ID TECN COMMENT
< 6.8 × 10 −8 90 MIYAZAKI 10 BELL 671 fb −1 , E ee
•••We do not use the following data for averages, fits, limits, etc. •••
< 8.0 × 10 −7 90 YUSA 06 BELL 158 fb −1 E ee cm
< 2.5 × 10 −7 90 AUBERT,BE 05D BABR 221 fb −1 , E ee