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Zhu, Z. B. Li, Z. G. Wang, Z. G. Zhao, Z. Haddadi, Zhiqiang Liu, Zhiqing Liu, Z. H. Qin, Z. H. Wang, Z. H. Zhang, Z. Jiao, Z. J. Sun, Z. J. Xiao, Z. L. Hou, Z. Ning, Z. P. Mao, Z. P. Zhang, Z. T. Sun, Z. Wang, Z. Wu, Z. Xue, Z. Y. Deng, Z. Y. He, Z. Y. Wang, Z. Y. Zhang","submitted_at":"2014-04-18T05:28:44Z","abstract_excerpt":"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 $\\mathcal{A}^{CP}_{K\\pi}$ of the branching fractions of $D \\to K^-\\pi^+$ in $CP$-odd and $CP$-even eigenstates to be $(12.7\\pm1.3\\pm0.7)\\times10^{-2}$. $\\mathcal{A}^{CP}_{K\\pi}$ can be used to extract the strong phase difference $\\delta_{K\\pi}$ between the doubly Cabibbo-suppressed process $\\overline{D}{}^{0}\\to K^-\\pi^+$ and the Cabibbo-favored process $D^0\\to K^- \\pi^+$. 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