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Improved model-independent determination of the strong-phase difference between <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>D</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mover accent="true"><mml:mi>D</mml:mi><mml:mo stretchy="false">¯</mml:mo></mml:mover><mml:mn>0</mml:mn></mml:msup><mml:mo stretchy="false">→</mml:mo><mml:msubsup><mml:mi>K</mml:mi><…
We present a measurement of the strong-phase difference between ${D}^{0}$ and ${\overline{D}}^{0}\ensuremath{\rightarrow}{K}_{\mathrm{S},\mathrm{L}}^{0}{K}^{+}{K}^{\ensuremath{-}}$ decays, performed through a study of quantum-entangled pairs of charm mesons. The measurement exploits a data sample equivalent to an integrated luminosity of $2.93\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, collected by the BESIII detector in ${e}^{+}{e}^{\ensuremath{-}}$ collisions corresponding to the mass …