Measurement of the $D\to K^-π^+$ strong phase difference in $ψ(3770)\to D^0\overline{D}{}^0$
We study $D^0\overline{D}{}^0$ pairs produced in $e^+e^-$ collisions at $\sqrt{s}=3.773$ GeV using a data sample of 2.92 fb$^{-1}$ collected with the BESIII detector. We measure the asymmetry $\mathcal{A}^{CP}_{Kπ}$ of the branching fractions of $D \to K^-π^+$ in $CP$-odd and $CP$-even eigenstates to be $(12.7\pm1.3\pm0.7)\times10^{-2}$. $\mathcal{A}^{CP}_{Kπ}$ can be used to extract the strong phase difference $δ_{Kπ}$ between the doubly Cabibbo-suppressed process $\overline{D}{}^{0}\to K^-π^+$ and the Cabibbo-favored process $D^0\to K^- π^+$. Using world-average values of external parameters, we obtain $\cosδ_{Kπ} = 1.02\pm0.11\pm0.06\pm0.01$. Here, the first and second uncertainties are statistical and systematic, respectively, while the third uncertainty arises from the external parameters. This is the most precise measurement of $δ_{Kπ}$ to date.