ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2008, vol. 660, p. 154-160
Search for lepton flavor violating τ decays into three leptons
We search for lepton flavor violating τ decays into three leptons (electron or muon) using 535 fb-1 of data collected with the Belle detector at the KEKB asymmetric-energy e+ e- collider. No evidence for these decays is observed, and we set 90% confidence level upper limits on the branching fractions of (2.0 - 4.1) × 10-8. These results improve upon our previously published upper limits by factors of 4.9 to 10. © 2008 Elsevier B.V. All rights reserved.