We present a measurement of the branching fraction of B+ → τ+ντ decays using 387 ± 6 × 106 ϒ(4S) collected between 2019and2022 withtheBelle II detector at theSuperKEKBeþ e+ e- collider.We reconstruct the accompanying B- meson using the hadronic tagging method, while B+ → τ+ντ candidates are identified in the recoil. We find evidence for B+ → τ+ντ decays at 3.0 standard deviations, including systematic uncertainties.The measured branching fraction is(Formula presended.).

Measurement of B+→ τ+ν_τ branching fraction with a hadronic tagging method at Belle II

Bianchi, F.;Boschetti, A.;Destefanis, M.;Maggiora, M.;Marcello, S.;Spataro, S.;
2025-01-01

Abstract

We present a measurement of the branching fraction of B+ → τ+ντ decays using 387 ± 6 × 106 ϒ(4S) collected between 2019and2022 withtheBelle II detector at theSuperKEKBeþ e+ e- collider.We reconstruct the accompanying B- meson using the hadronic tagging method, while B+ → τ+ντ candidates are identified in the recoil. We find evidence for B+ → τ+ντ decays at 3.0 standard deviations, including systematic uncertainties.The measured branching fraction is(Formula presended.).
2025
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Adachi, I.; Adamczyk, K.; Ahmed, H.; Ahn, Y.; Aihara, H.; Akopov, N.; Alhakami, M.; Aloisio, A.; Althubiti, N.; Angelsmark, M.; Anh Ky, N.; Asner, D. ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/2121117
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