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We report measurements of branching fractions and time-dependent CPasymmetries in $B^{0} \to D^{+}D^{-}$ and $B^{0} \to D^{*\pm}D^{\mp}$ decaysusing a data sample that contains $(772 \pm 11)\times 10^6 B\bar{B}$ pairscollected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKBasymmetric-energy $e^+ e^-$ collider. We determine the branching fractions tobe $\mathcal{B}(B^{0} \to D^{+}D^{-})=(2.12 \pm 0.16 \pm 0.18)\times 10^{-4}$and $\mathcal{B}(B^{0} \to D^{*\pm}D^{\mp}=(6.14 \pm 0.29 \pm 0.50)\times10^{-4}$. We measure CP asymmetry parameters $\mathcal{S}_{D^{+}D^{-}} =-1.06_{-0.14}^{+0.21} \pm 0.08$ and $\mathcal{C}_{D^{+}D^{-}} = -0.43 \pm 0.16\pm 0.05$ in $B^{0} \to D^{+}D^{-}$ and $\mathcal{A}_{D^{*}D} = +0.06 \pm 0.05\pm 0.02$, $\mathcal{S}_{D^{*}D} = -0.78 \pm 0.15 \pm 0.05$,$\mathcal{C}_{D^{*}D} = -0.01 \pm 0.11 \pm 0.04$, $\Delta\mathcal{S}_{D^{*}D} =-0.13 \pm 0.15 \pm 0.04$ and $\Delta\mathcal{C}_{D^{*}D} = +0.12 \pm 0.11 \pm0.03$ in $B^{0} \to D^{*\pm}D^{\mp}$, where the first uncertainty isstatistical and the second is systematic. We exclude the conservation of CPsymmetry in both decays at equal to or greater than $4\sigma$ significance.

Measurements of Branching Fractions and Time-dependent CP Violating Asymmetries in $B^{0} \to D^{(*)\pm}D^{\mp}$ Decays