Improved Limits on Lepton-Flavor-Violating τ Decays to ℓϕ, ℓρ, ℓK*, and ℓK¯*

Aubert, B. et al. (2009) Improved Limits on Lepton-Flavor-Violating τ Decays to ℓϕ, ℓρ, ℓK*, and ℓK¯*. Physical Review Letters, 103 (2). 021801. ISSN 0031-9007

Abstract

We search for the neutrinoless, lepton-flavor-violating tau decays τ-→ℓ-V0, where ℓ is an electron or muon and V0 is a vector meson reconstructed as ϕ→K+K-, ρ→π+π-, K*→K+π-, K̅ *→K-π+. The analysis has been performed using 451 fb-1 of data collected at an e+e- center-of-mass energy near 10.58 GeV with the BABAR detector at the PEP-II storage rings. The number of events found in the data is compatible with the background expectation, and upper limits on the branching fractions are set in the range (2.6–19)×10-8 at the 90% confidence level.

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