Recent measurements of branching fractions and CP asymmetries of charmless hadronic B meson decays at Belle

2017/10/09 by A. B. Kaliyar, Kaliyar, A. B.
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.1710.02962

openalex publication_date 2017/10/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Hadronic B decays without a charm quark constitute a powerful probe to search for physics beyond the standard model as well as to provide constraints on CP violation parameters. We report final measurements from Belle of the branching fractions and CP asymmetries for the decays B⁰ → π⁰ π⁰ and B^± → K⁺ K^- π^±. The B⁰ → π⁰ π⁰ measurements enable us to improve constraints on the angle ϕ₂ of the CKM unitarity triangle. For B^± → K⁺ K^- π^± we measure CP asymmetry as a function of the invariant mass of the K⁺K^- system, where we find a strong evidence for large CP violation and a large increase in yield at low mass region. This result challenges conventional theoretical approaches as it requires a large enhancement in both tree and loop level diagrams in the same small region of phase-space.

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