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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2502.12873 |
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Table of Contents:
- A first determination of the strong-phase difference between $D^0$ and $\bar{D^0}\to K^+K^-π^+π^-$ is performed using $e^+e^-\toψ(3770)\to D\bar{D}$ 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 $B^\pm \to DK^\pm$ decays. From these measurements, it follows that the $C\!P$-even fraction of the decay is $F_+ = 0.754 \pm 0.010_{\rm \, stat.} \pm 0.008_{\rm \, syst.}$. In addition, the branching fraction of $D^0 \to K^+K^-π^+π^-$ is measured to be $(2.863 \pm 0.028_{\rm \, stat.} \pm 0.045_{\rm \, syst.})\times10^{-3}$, which is twice as precise as previous results obtained at other experiments.