Measurement ofCPviolation parameters inB0→DK*0decays

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Abstract

An analysis of ${B}^{0}\ensuremath{\rightarrow}D{K}^{*0}$ decays is presented, where $D$ represents an admixture of ${D}^{0}$ and ${\overline{D}}^{0}$ mesons reconstructed in four separate final states: ${K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$, ${\ensuremath{\pi}}^{\ensuremath{-}}{K}^{+}$, ${K}^{+}{K}^{\ensuremath{-}}$ and ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$. The data sample corresponds to $3.0\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of proton-proton collision, collected by the LHCb experiment. Measurements of several observables are performed, including $CP$ asymmetries. The most precise determination is presented of ${r}_{B}(D{K}^{*0})$, the magnitude of the ratio of the amplitudes of the decay ${B}^{0}\ensuremath{\rightarrow}D{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ with a $b\ensuremath{\rightarrow}u$ or a $b\ensuremath{\rightarrow}c$ transition, in a $K\ensuremath{\pi}$ mass region of $\ifmmode\pm\else\textpm\fi{}50\text{ }\text{ }\mathrm{MeV}/{c}^{2}$ around the ${K}^{*}(892)$ mass and for an absolute value of the cosine of the ${K}^{*0}$ helicity angle larger than 0.4.

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