### Abstract

The decay B

^{0}→ DK^{*0}and the charge conjugate mode are studied using 1.0 fb^{−1}of pp collision data collected by the LHCb experiment at √s = 7 TeV in 2011. The CP asymmetry between the B^{0}→ DK^{*0}and the B^{0}→ DK^{*0}decay rates, with the neutral D meson in the CP-even final state K^{+}K^{−}‚ is found to be A<inf>d</inf>^{KK}= −0.45 ± 0.23 ± 0.02, where the first uncertainty is statistical and the second is systematic. In addition, favoured B^{0}→ DK^{*0}decays are reconstructed with the D meson in the non-CP eigenstate K^{+}π^{−}. The ratio of the B-flavour averaged decay rates in D decays to CP and non-CP eigenstates is measured to be R<inf>d</inf>^{KK}= 1.36^{+0.37}<inf>−0.32</inf> ± 0.07, where the ratio of the branching fractions of D0 → K^{−}π^{+}to D^{0}→ K^{+}K^{−}decays is included as multiplicative factor. The CP asymmetries measured with two control channels, the favoured B^{0}→ DK^{*0}decay with D → K^{+}π^{−}and the B^{0}<inf>s</inf> → DK^{*0}decay with D → K^{+}K^{−}, are also reported.Original language | English |
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Journal | Journal of High Energy Physics |

Volume | 2013 |

Issue number | 3 |

DOIs | |

Publication status | Published - 2013 |

### Bibliographical note

Aaij:2012fd## Fingerprint Dive into the research topics of 'Measurement of CP observables in $B^0 \to D K^*0$ with $D \to K^+ K^-$'. Together they form a unique fingerprint.

## Cite this

Aaij, R., van den Brand, J. F. J., Dettori, F., Ketel, T. J., Koopman, R., Lambert, R. W., ... LHCb, C. (2013). Measurement of CP observables in $B^0 \to D K^*0$ with $D \to K^+ K^-$.

*Journal of High Energy Physics*,*2013*(3). https://doi.org/10.1007/JHEP03(2013)067