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

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.

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Belle II Collaboration, Author
Abudinén, F., Author
Adachi, I., Author
Adamczyk, K., Author
Aggarwal, L., Author
Ahlburg, P., Author
Ahmed, H., Author
Ahn, J. K., Author
Aihara, H., Author
Akopov, N., Author
Aloisio, A., Author
Andricek, L.1, Author
Ky, N. Anh, Author
Asner, D. M., Author
Atmacan, H., Author
Aulchenko, V., Author
Aushev, T., Author
Aushev, V., Author
Aversano, M., Author
Babu, V., Author
more..
Affiliations:
1Max Planck Semiconductor Laboratory, Max Planck Society, Isarauenweg 1, 85748 Garching bei München, DE, ou_3587780              

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Free keywords: High Energy Physics - Experiment, hep-ex
 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

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 Dates: 2023-05-082023-05-16
 Publication Status: Not specified
 Pages: -
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 Rev. Type: -
 Identifiers: arXiv: 2305.04759
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