Measurements of the CP-even fractions of D⁰→π⁺π^-π⁰ and D⁰→ K⁺K^-π⁰ at BESIII

2024/09/11 by BESIII Collaboration, M. Ablikim, Ablikim, M. +747
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.2409.07197

openalex publication_date 2024/09/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The CP-even fractions (F₊) of the decays D⁰→π⁺π^-π⁰ and D⁰→ K⁺K^-π⁰ are measured with a quantum-correlated ψ(3770)→ DD data sample collected by the BESIII experiment corresponding to an integrated luminosity of 7.93 fb^-1. The results are F₊^π⁺π^-π⁰=0.9406±0.0036±0.0021 and F₊^K⁺K^-π⁰=0.631±0.014±0.011, where the first uncertainties are statistical and the second systematic. These measurements are consistent with the previous determinations, and the uncertainties for F₊^π⁺π^-π⁰ and F₊^K⁺K^-π⁰ are reduced by factors of 3.9 and 2.6, respectively. The reported results provide important inputs for the precise measurement of the angle γ of the Cabibbo-Kobayashi-Maskawa matrix and indirect CP violation in charm mixing.

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