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- W4213199537 abstract "A search for the decay B → π τ ν is presented. The search is performed on the full Belle data set containing 772E6 B anti-B pairs, collected at the Y(4s) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider. The τ lepton is reconstructed in the decays τ → e ν ν, τ → μ ν ν, τ → π ν, and τ → ρ ν. A full reconstruction algorithm based on NeuroBayes is used to reconstruct one B meson, the Btag, in a hadronic decay. The remainder of a signal event contains exactly two charged particles. The separation between signal and background events is performed using boosted decision trees. A fit is performed in the distribution of the extra energy in the electromagnetic calorimeter ECL, which is defined as all energy deposited by neither the Btag nor the reconstructed signal final state particles. No significant signal is observed and an upper limit of Br( B → π τ ν ) < 2.5E-4 is obtained at the 90% confidence level. The result is in good agreement with the Standard Model predictions." @default.
- W4213199537 created "2022-02-24" @default.
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- W4213199537 date "2022-02-21" @default.
- W4213199537 modified "2023-09-27" @default.
- W4213199537 title "Search for B → π τ ν with hadronic tagging at Belle" @default.
- W4213199537 doi "https://doi.org/10.53846/goediss-5386" @default.
- W4213199537 hasPublicationYear "2022" @default.
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