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• W4310924889 abstract "We search for lepton-flavor violating $tau^-to e^-alpha$ and $tau^-tomu^-alpha$ decays, where $alpha$ is an invisible spin-0 boson. The search uses electron-positron collisions at $10.58$ GeV center-of-mass energy with an integrated luminosity of $62.8$ fb$^{-1}$, produced by the SuperKEB collider and collected with the Belle II detector. We search for an excess in the lepton-energy spectrum of the known $tau^-to e^-barnu_e nu_tau$ and $tau^-to mu^-barnu_mu nu_tau$ decays. We report 95%-confidence-level upper limits on the branching-fraction ratio ${mathcal B}(tau^-to e^- alpha) / {mathcal B}(tau^- to e^- barnu_e nu_tau)$ in the range $(1.1-9.7) times 10^{-3}$ and on ${mathcal B}(tau^-to mu^- alpha) / {mathcal B}(tau^- to mu^- barnu_mu nu_tau)$ in the range $(0.7-12.2) times 10^{-3}$ for $alpha$ masses between $0$ GeV/c$^2$ and 1.6 GeV/c$^2$. These results provide the most stringent bounds on invisible boson production from $tau$ decays." @default.
• W4310924889 created "2022-12-21" @default.
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