Search for lepton flavor violating τ→ ℓ V⁰ decays at Belle

2007/08/24 by The Belle Collaboration, Abe, K.
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.0708.3276

Abstract

We have searched for neutrinoless τ lepton decays into ℓ and V⁰, where ℓ stands for an electron or muon, and V⁰ for a vector meson (ϕ, ω, K^*0 or K^*0), using 543 fb^-1 of data collected with the Belle detector at the KEKB asymmetric-energy e⁺e^- collider. No excess of signal events over the expected background is observed, and we set upper limits on the branching fractions in the range (0.7 - 1.8) × 10^-7 at the 90% confidence level. These upper limits include the first results for ℓ ω as well as new limits that are 3.6 - 9.6 times more restrictive than our previous results for ℓ ϕ, ℓ K^*0 and ℓ K^*0.

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