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From a time-dependent analysis of ${{\mathit D}}$ mixing in ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$. This result uses external constraints on R$_{M}$= 1/2 (x${}^{2}$ + y${}^{2}$). Without such constraints, AAIJ 2016F measure ($0.3$ $\pm1.8$) $ \times 10^{-3}$, with a large correlation coefficient to R$_{M}$.
References:
AAIJ
2016F
PRL 116 241801
First Observation of ${{\mathit D}^{0}}−{{\overline{\mathit D}}^{0}}$ Oscillations in ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ Decays and Measurement of the Associated Coherence Parameters