Measurement of the D^∗- polarization in the decay B⁰ → D^{∗ -}τ⁺ν_τ

2019/03/07 by Belle Collaboration, A. Abdesselam, I. Adachi +542 · 1 citation
Engineering · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Superconducting Materials and Applications

paper · pdf · doi:10.48550/arxiv.1903.03102

openalex publication_date 2019/03/07 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/28

Abstract

We report the first measurement of the D^{∗ -} meson polarization in the decay B⁰ → D^*- τ⁺ν_τ using the full data sample of 772× 10⁶ BB pairs recorded with the Belle detector at the KEKB electron-positron collider. Our result, F_L^{D^∗} = 0.60 ± 0.08 (\rm stat) ± 0.04 (\rm sys), where F_L^{D^∗} denotes the D^∗- meson longitudinal polarization fraction, agrees within about 1.7 standard deviations of the standard model prediction.

Cited by

• Lepton Flavor Universality tests through angular observables of B→ D^(∗)ℓν decay modes

Related

• Measurement of the τ lepton polarization in the decay B → D^* τ^- ν_τ
• Recent B → D^(*) τ^- ν_τ Studies at Belle
• B → D^(*) τ^- ν_τ and Related Tauonic Topics at Belle
• Tau Polarimetry in B Meson Decays
• Semitauonic B decays at Belle/Belle II