Updated model-independent measurement of the strong-phase differences between D0 and $ {\overline{\textrm{D}}}^0\to {\textrm{K}}_{\textrm{S}/\textrm{L}}^0{\uppi}^{+}{\uppi}^{-} $ decays

The strong-phase differences between ${D}^0\to {K}_{S(L)}^0{\pi}^{+}{\pi}^{-}$ and ${\overline{D}}^0\to {K}_{S(L)}^0{\pi}^{+}{\pi}^{-}$ decays are one of the most important inputs in measuring the CP violating angle γ via B − → DK − decays. They also play a key role in studies of charm mixing and indirect CP violation. In this paper, the strong-phase differences are determined in a model-independent way with quantum-correlated D 0-${\overline{D}}^0$ decays from 7.93 fb −1 of e + e − annihilation data at $\sqrt{s}$ = 3.773 GeV by the BESIII experiment. These results are the most precise to date and are expected to significantly reduce associated uncertainties in determining the CP violating angle γ and related charm mixing parameters.