Aubert, B. et al. (2005) Search for Lepton-Flavor and Lepton-Number Violation in the Decay τ-→ℓ∓h±h′-. Physical Review Letters, 95 (19). p. 191801. ISSN 0031-9007

A search for lepton-flavor and lepton-number violation in the decay of the tau lepton into one charged lepton and two charged hadrons is performed using 221.4  fb-1 of data collected at an e+e- center-of-mass energy of 10.58 GeV with the BABAR detector at the SLAC PEP-II storage ring. In all 14 decay modes considered, the observed data are compatible with background expectations, and upper limits are set in the range B(τ→ℓhh′)<(0.7-4.8)×10-7 at 90% confidence level.