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We present Dalitz plot analyses for the decays of $B$ mesons to $D^- D^0 K^+$and $\overline{D}^0 D^0 K^+$. We report the observation of the$D^{*}_{s1}(2700)^+$ resonance in these two channels and obtain measurements ofthe mass $M(D^{*}_{s1}(2700)^+) = 2699 {}^{+14}_{-7} \, \mathrm{MeV}/c^2$ andof the width $\Gamma(D^{*}_{s1}(2700)^+) = 127 {}^{+24}_{-19} \, \mathrm{MeV}$,including statistical and systematic uncertainties. In addition, we observe anenhancement in the $D^0K^+$ invariant mass around 2350--2500 MeV/$c^2$ in bothdecays $B^0 \to D^- D^0 K^+$ and $B^+ \to \overline{D}^0 D^0 K^+$, which we arenot able to interpret. The results are based on $429~\mathrm{fb}^{-1}$ of datacontaining $471\times10^6\, B\overline{B}$ pairs collected at the$\Upsilon{(4S)}$ resonance with the BaBar detector at the SLAC NationalAccelerator Laboratory.

Dalitz plot analyses of $B^0 \to D^- D^0 K^+$ and $B^+ \to \overline{D}^0 D^0 K^+$ decays