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Search for lepton-flavor-violating τ−→ℓ−ϕ decays in 2019-2021 Belle II data

MPS-Authors

Andricek,  L.
Max Planck Semiconductor Laboratory, Max Planck Society;

Ninkovic,  J.
Max Planck Semiconductor Laboratory, Max Planck Society;

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2305.04759.zip
(Preprint), 1010KB

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Citation

Belle II Collaboration, Abudinén, F., Adachi, I., Adamczyk, K., Aggarwal, L., Ahlburg, P., et al. (in preparation). Search for lepton-flavor-violating τ−→ℓ−ϕ decays in 2019-2021 Belle II data.


Cite as: https://hdl.handle.net/21.11116/0000-000F-AFCE-5
Abstract
We report a search for lepton-flavor-violating decays τ−→ℓ−ϕ (ℓ−=e−,μ−) at the Belle II experiment, using a sample of electron-positron data produced at the SuperKEKB collider in 2019-2021 and corresponding to an integrated luminosity of 190 fb−1. We use a new untagged selection for e+e−→τ+τ− events, where the signal τ is searched for as a neutrinoless final state of a single charged lepton and a ϕ meson and the other τ is not reconstructed in any specific decay mode, in contrast to previous measurements by the BaBar and Belle experiments. We find no evidence for τ−→ℓ−ϕ decays and obtain upper limits on the branching fractions at 90% confidence level of 23 ×10−8 and 9.7×10−8 for τ−→e−ϕ and τ−→μ−ϕ, respectively