Measurement of the strong-phase difference between D⁰ and D⁰→ K⁺K^-π⁺π^- in bins of phase space

2025/02/18 by BESIII Collaboration
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2502.12873

Abstract

A first determination of the strong-phase difference between D⁰ and D⁰→ K⁺K^-π⁺π^- is performed using e⁺e^-→ψ(3770)→ DD data collected by the BESIII detector corresponding to an integrated luminosity of 20.3 fb^-1. The measurements are made in four pairs of bins in phase space, which are chosen to provide optimal sensitivity to the angle γ of the Unitarity Triangle in B^± → DK^± decays. From these measurements, it follows that the C P-even fraction of the decay is F₊ = 0.754 ± 0.010_{\rm stat.} ± 0.008_{\rm syst.}. In addition, the branching fraction of D⁰ → K⁺K^-π⁺π^- is measured to be (2.863 ± 0.028_{\rm stat.} ± 0.045_{\rm syst.})×10^-3, which is twice as precise as previous results obtained at other experiments.

Related

• Model-independent determination of the strong-phase difference between D⁰ and D⁰ → π⁺π^-π⁺π^- decays
• A novel measurement of the strong-phase difference between D⁰→ K^-π⁺ and D⁰→ K^-π⁺ decays using C-even and C-odd quantum-correlated DD pairs
• Updated model-independent measurement of the strong-phase differences between D⁰ and D⁰ → K⁰_S/Lπ⁺π^- decays
• Measurements of the CP-even fractions of D⁰→π⁺π^-π⁰ and D⁰→ K⁺K^-π⁰ at BESIII
• Amplitude analysis and branching fraction measurement of the decay D⁰ → K⁰_Sπ⁰π⁰