Time-dependent CP violation results at Belle II

2023/05/16 by Michele Veronesi, Veronesi, Michele
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2305.09153

openalex publication_date 2023/05/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We report updates on time-dependent CP-violation observables at Belle II. The benchmark measurements of the B⁰ lifetime τ_B⁰ and mixing frequency Δm_d using flavor specific hadronic decays and the determination of the CP-violating phase sin2ϕ₁ in b→ ccs transitions have been performed using data collected between 2019-2021. These analyses use only half of the current available dataset and are still statistically limited, showing the excellent performance of the detector and readiness of the analysis tools. We present three new results on the effective value of sin2ϕ₁ in b→ qqs transitions, which are highly sensitive to generic non-Standard Model (SM) physics amplitudes, using the full dataset collected between 2019-2022.

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