Dalitz plot analyses of B0→D−D0K+ and B+→D¯0D0K+ decays

Le résumé fourni par la source

We present Dalitz plot analyses for the decays of $B$ mesons to ${D}^{\ensuremath{-}}{D}^{0}{K}^{+}$ and ${\overline{D}}^{0}{D}^{0}{K}^{+}$. We report the observation of the ${D}_{s1}^{*}(2700{)}^{+}$ resonance in these two channels and obtain measurements of the mass $M({D}_{s1}^{*}(2700{)}^{+})={2699}_{\ensuremath{-}7}^{+14}\text{ }\text{ }\mathrm{MeV}/{c}^{2}$ and of the width $\mathrm{\ensuremath{\Gamma}}({D}_{s1}^{*}(2700{)}^{+})={127}_{\ensuremath{-}19}^{+24}\text{ }\text{ }\mathrm{MeV}$, including statistical and systematic uncertainties. In addition, we observe an enhancement in the ${D}^{0}{K}^{+}$ invariant mass around $2350--2500\text{ }\text{ }\mathrm{MeV}/{c}^{2}$ in both decays ${B}^{0}\ensuremath{\rightarrow}{D}^{\ensuremath{-}}{D}^{0}{K}^{+}$ and ${B}^{+}\ensuremath{\rightarrow}{\overline{D}}^{0}{D}^{0}{K}^{+}$, which we are not able to interpret. The results are based on $429\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data containing $471\ifmmode\times\else\texttimes\fi{}1{0}^{6}B\overline{B}$ pairs collected at the $\mathrm{\ensuremath{\Upsilon}}(4S)$ resonance with the BABAR detector at the SLAC National Accelerator Laboratory.

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