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

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

paper · pdf · doi:10.48550/arxiv.0708.3276

6 pages, 11 figures, contributed to EPS 2007 and Lepton Photon 2007

arxiv created 2007/08/24 · arxiv updated 2009/12/01

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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