Measurements of the branching fraction, polarization, and CP asymmetry for the decay B⁰→ ωω

2024/01/09 by Y. Guan, Belle Collaboration, A. J. Schwartz +264
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.2401.04646

openalex publication_date 2024/01/09 · openalex created_date 2024/01/13 · openalex updated_date 2026/08/01

Abstract

We present a measurement of B⁰ → ωω, a charmless decay into two vector mesons, using 772 × 10⁶ BB pairs collected with the Belle detector at the KEKB e⁺e^- collider. The decay is observed with a significance of 7.9 standard deviations. We measure a branching fraction B = (1.53 ± 0.29 ± 0.17) × 10^-6, a fraction of longitudinal polarization f_L = 0.87 ± 0.13 ± 0.13, and a time-integrated CP asymmetry A_CP = -0.44 ± 0.43 ± 0.11, where the first uncertainties listed are statistical and the second are systematic. This is the first observation of B⁰ → ωω, and the first measurements of f_L and A_CP for this decay.

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