Prospects for exploring quantum-correlated neutral DD̄ decays at STCF

We investigate the prospects for determining charm mixing, indirect $C\!P$ violation and hadronic parameters in charm decays with quantum-correlated neutral charm mesons at the proposed Super Tau-Charm Facility. The study is based on time-integrated double tag rates of coherent DD̄ pairs produced at √s=3.773 and $4.030$ GeV, from e⁺e⁻→ D(*)D̄(*) processes. Here, one D is tagged with the quasi flavour-specific decays D→ K⁻π⁺π⁺π⁻, K⁻π⁺π⁰, and K⁻π⁺, while the other D̄ is detected with the final states in flavour-specific mode, $C\!P$ eigenstate mode, or self-conjugate mode. The expected sensitivities are evaluated assuming an integrated luminosity of 1~ ab⁻¹ at each energy point, demonstrating the capability on precise determination of the charm mixing parameters, the indirect $C\!P$ violation parameters, the strong-phase differences, and the coherence factors. The constraints of the hadronic-parameters provide unique inputs to the CKM angle $γ$ fit, while the measurements of charm mixing and indirect $C\!P$ violation parameters are complementary to the time-dependent measurements in the Belle II and LHCb experiments.