Observation of D → a₀(980)π in the decays D⁰ → π⁺π^-η and D⁺ → π⁺π⁰η

2024/04/14 by BESIII Collaboration, Ablikim, M., М. Н. Ачасов +733
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.2404.09219

openalex publication_date 2024/04/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We report the first amplitude analysis of the decays D⁰ → π⁺ π^- η and D⁺ → π⁺π⁰η using a data sample taken with the BESIII detector at the center-of-mass energy of 3.773 GeV, corresponding to an integrated luminosity of 7.9 \rm fb^-1. The contribution from the process D⁰⁽⁺⁾ → a₀(980)⁺ π^-(0) is significantly larger than the D⁰⁽⁺⁾ → a₀(980)^-(0) π⁺ contribution. The ratios B(D⁰ → a₀(980)⁺π^-)/B(D⁰ → a₀(980)^-π⁺) and B(D⁺ → a₀(980)⁺π⁰)/B(D⁺ → a₀(980)⁰π⁺) are measured to be 7.5^+2.5_{-0.8 stat.}±1.7_syst. and 2.6±0.6_stat.±0.3_syst., respectively. The measured D⁰ ratio disagrees with the theoretical predictions by orders of magnitudes, thus implying a substantial contribution from final-state interactions.

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