Measurement of the branching fraction of B⁺ -> tau⁺ nu_tau decays with the semileptonic tagging method

2015/03/18 by B. Kronenbitter, Belle Collaboration, M. Heck +278
Engineering · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Particle Accelerators and Free-Electron Lasers #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.1503.05613

openalex publication_date 2015/03/18 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28

Abstract

We report a measurement of the branching fraction of B⁺ -> tau⁺ nu_tau decays using a data sample of 772 x 10⁶ BBbar pairs, collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e⁺e^- collider. We reconstruct the accompanying B meson in a semileptonic decay and detect the recoiling B candidate in the decay channel B⁺ -> tau⁺ nu_tau. We obtain a branching fraction of BR(B⁺ -> tau⁺ nu_tau) = [1.25 +- 0.28 (stat.) +- 0.27 (syst.)] x 10^-4. This result is in good agreement with previous measurements and the expectation from the calculation based on the Standard Model.

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