Search for the Lepton-Flavor-Violating Decay $τ^- \to μ^- η$ at Belle

Details Search for the Lepton-Flavor-Violating Decay $τ^- \to μ^- η$ at Belle Search for the Lepton-Flavor-Violating Decay $τ^- \to μ^- η$ at Belle

2004-04-12

arxiv.org/abs/hep-ex/0404018v2

Phys.Rev.Lett.93:081803,2004

Physics

High Energy Physics

High Energy Physics - Experiment

Submitted to Phys.Rev.Lett

Scientific paper

10.1103/PhysRevLett.93.081803

We have searched for the Lepton Flavor Violating decay $\tau^- \to \mu^- \eta$ using a data sample of 84.3 fb$^{-1}$ accumulated with the Belle detector at KEK. The $\eta$-meson was detected through the decay modes: $\eta \to \gamma\gamma$ and $\pi^+\pi^-\pi^0$. No signal candidates are found, and we obtain an upper limit for the branching fraction ${\cal B}(\tau^- \to \mu^- \eta)<3.4\times 10^{-7}$ at the 90% confidence level.

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