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.).

Adachi, I., Adamczyk, K., Ahmed, H., Ahn, Y., Aihara, H., Akopov, N., et al. (2025). Measurement of B+→τ+ντ branching fraction with a hadronic tagging method at Belle II. PHYSICAL REVIEW D, 112(7), 072002-1-072002-17 [10.1103/dcwd-5tg4].

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

Branchini, P.
Membro del Collaboration Group
;
Budano, A.
Membro del Collaboration Group
;
Bussino, S.
Membro del Collaboration Group
;
De Pietro, G.
Membro del Collaboration Group
;
Laurenza, M.
Membro del Collaboration Group
;
Martellini, C.
Membro del Collaboration Group
;
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
Adachi, I., Adamczyk, K., Ahmed, H., Ahn, Y., Aihara, H., Akopov, N., et al. (2025). Measurement of B+→τ+ντ branching fraction with a hadronic tagging method at Belle II. PHYSICAL REVIEW D, 112(7), 072002-1-072002-17 [10.1103/dcwd-5tg4].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/528958
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